CHAPTER VII

THE PROSOMATIC SEGMENTS OF LIMULUS AND ITS ALLIES

Comparison of the trigeminal with the prosomatic region--The prosomatic appendages of the Gigantostraca--Their number and nature--Endognaths and ectognath--The metastoma--The coxal glands-- Prosomatic region of Eurypterus compared with that of Ammocoetes-- Prosomatic segmentation shown by marks on carapace--Evidence of coelomic cavities in Limulus--Summary 233