A Monograph On The Sub Class Cirripedia Volume 1 Of 2 The Lepad

My duty, in acknowledging the great obligations under which I lie to many naturalists, affords me most sincere pleasure. I had originally intended to have described only a singl...

From the peculiar curved position which the animal’s body occupies within the capitulum, I have found it far more convenient (not to mention the confusion of nomenclature alread...

[11] M. Dujardin has lately (‘Comptes Rendus,’ Feb. 5, 1850, as cited in ‘Annals of Nat. History,’ vol. v, p. 318,) discovered that the “Hypopi are Acari with eight feet, withou...

I will now proceed to a general description of the different parts and organs in the Lepadidæ. The Capitulum is usually much flattened, but sometimes broadly oval in section. It...

_Mouth._--This is prominent, and almost probosciformed (Pl. IX, fig. 4 _b_), and in the abnormal Anelasma (Pl. IV, fig. 2 _d_), quite probosciformed,--such, also, was its charac...

In all the genera, the double eye is seated deep within the body; it is attached by fibrous tissue to the radiating muscles of the lowest part of the oesophagus, and lies actual...

_Exuviation; Rate of Growth; Size._--I have had occasion repeatedly to allude to the exuviation of the Lepadidæ: with the exception of the genus Lithotrya,[20] in which the calc...

[24] As this, though the commonest species, has never been defined, I give only a few synonyms and references, it being quite impossible to distinguish, in any published descrip...

_Monstrous Variety._--In Mr. Stutchbury’s collection, there was a specimen, with the scuta, broad, smooth, thin, and fragile, without any ridge running from the umbo to the apex...

_Peduncle_,--short, narrow, being abruptly inflected all round under the basal edges of the capitulum; lower part of very variable shape, being often suddenly contracted into a...

_General Remarks._--This species has the closest general resemblance to _P. Kæmpferi_, and is evidently a representative of it. On close examination, however, almost every part...

_General Remarks._--Four of the five species, forming this genus, though certainly distinct, are closely allied. I have already shown, that although the characters separating Le...

_Terga._--These are of a singular shape; they are about three-fourths as long as the occludent segment of the scuta, and in their widest part, of greater width than it. They con...

The _Terga_ are developed in an extremely variable degree; they are often entirely cast off and absent. In very young specimens, they are of the same length with the carina, but...

_Filamentary Appendages, trophi and cirri_ all similar to the same parts in _C. virgata_; but perhaps the anterior faces of the segments in the posterior cirri are rather less p...

_First Cirrus_ placed far from the second, with the top of its pedicel on a level with the top of the lower segment of the pedicel of the second cirrus; rami short, barely half...

_Habits._--According to Lovén, this species lives imbedded in the skin of _Squalus maximus_ and _spinax_, in the North Sea: I suspect that it is not closely compressed in its ca...

_Peduncle._--The main part of the animal, as may be seen in the drawing, consists of the peduncle, of which the imbedded portion tapers more or less suddenly in a very variable...

I have used the term parasitic, which perhaps ought strictly to be confined to cases where one creature derives its nutriment from another, inasmuch as the male is invariably an...

_Concluding Remarks._--If the creature which I have considered as the male of _Ibla Cumingii_ be really so, and the evidence formerly given seems to me amply conclusive, then th...

_Carina_ much bent, with the umbo placed at barely one third of the entire length of the valve from the apex. Two very slight ridges can be perceived, one on each side, running...

_Generative System._--The contents of the animal, between the sack containing the thorax and the outer integuments, and directly under the thorax, varied much in condition: in y...

_Maxillæ_, small, narrow, produced, without any notch, with two large upper spines, of which one is much thicker than the other; on the convex upper margin there are some minute...

In the concavity or hollow above the depression for the adductor muscle (Pl. VI, fig. 2 _a´_), I found males, but in so extremely decayed a condition, that they could hardly be...

I examined, owing to the great kindness of Mr. Cunning, six dry specimens of the hermaphrodite _S. Peronii_, from Swan River, and one in spirits from another locality, in the Br...

Had the question been, whether the parasites which I have now described, were simply the males of the Cirripedes to which they are attached, the present summary and discussion w...

Viewing the parasitic males, in relation to the structure and appearance of the species to which they belong, they present a singular series. In _S. Peronii_ and _S. villosum_,...

_Cirri_, short and rather thick; the first pair is not far removed from the second. The segments of the three posterior pair are somewhat protuberant, bearing six pair of short,...

_Variation._--In some specimens in the British Museum, collected by Sir J. Ross, in the Southern ocean, and in another older set from an unknown source, several parts of the out...

_Peduncle_, broad, barely as long as the capitulum. The calcareous scales are irregularly shaped, minute, elongated and pointed, placed in separate transverse rows, and crowded...

_Peduncle._--The most remarkable fact concerning this part, is that the outer tunic, together with the calcareous scales with which it is covered, is moulted at each successive...

Although it may be admitted that Lithotrya has the power of enlarging its cavity, how does it first bore down into the rock? It is quite certain that the basal cup is absolutely...

_Latera_ (fig. 3 _c_), in width equalling two and a half of the upper peduncular scales, or about one fourth or one fifth of the width of the carina; growing surface, (or a sect...

_Carina_, moderately large; seen externally, the surface presents an elongated triangle, with the apex truncated; on the internal face (fig. 1 _b´_, _d_) of the free part, there...

1_c´._ _Scalpellum ornatum_, cutum of half-grown specimen, viewed internally, much magnified, on same scale with fig. 1 _b´_. The depression (_b_) for the reception of the male...