48 Charles GELDERD 



REMARKS AND CONCLUSIONS. 



Our anatomical descriptions show that ail the species of Schizopoda 

 that we hâve examined, except Nyctiphanes, possess a great similarity of 

 structure in their digestive System. 



In Macropsis the great development of the mouth and of the œso- 

 phagus seems to hâve reacted upon the cardiac chatnber and reduced its 

 importance as a masticating cavity, for it is much less developed than in 

 the other species and is without teeth. 



In ail the species the typical pièces are found, Sj, 5^, 5, ; the latter 

 possessing latéral grooves in ail the species except in Nyctiphanes. 



In ail the species the médian superior pièce p. s. m. is found, though 

 reduced in Nyctiphanes. 



AU the species are rich in teeth, except Macropsis; spines and hairs 

 are found in great numbers upon the various pièces. 



There is always a passage from the cardiac chamber above the cavity 

 containing the pyloric pièces ; the chambers are distinctly separated from 

 one another. 



In ail cases the dorsal diverticulum is found, although it varies con- 

 siderably in form in the différent species. 



Ail the species hâve the singular glandular formations in the tubes of 

 the digestive glands, except Nyctiphanes; they seem to be characteristic of 

 the typical Schizopoda. 



Mysis kervillei, as far as the internai structure of the digestive organs 

 is concerned, seems to be only a variety oi Schistomysis ornata. 



Anchialm and Sirielia seem to be species closely allied to one another. 



We hâve seen that Nyctiphanes has a digestive System of a différent 

 structural plan to that of the Schizopoda; the digestive gland of this 

 species belongs to the decapod type. 



In a récent work on the colour-physiology of the higher Crustacea, 

 M. Keeble and D"" Gamble (') hâve observed that whereas till now the 



(') Keeble & Gamble : Loco citato. 



