A Guide to the Study of Fishes, Volume 1 (of 2)
CHAPTER XXV.
THE PROTOCHORDATA.
The Chordate Animals.--The Protochordates.--Other Terms Used in Classification.--The Enteropneusta.--Classification of Enteropneusta.--Family Harrimaniidæ.--Balanoglossidæ.--Low Organization of Harrimaniidæ. 460