32 



Charles GELDERD 



Glandular ridges are found in ail the Schizopoda that we hâve 

 examined, except Nyctiphancs .^.nà we hâve already observed that there 

 is a tendency to place the family Euphausiidse with the Decapoda. 



This formation seems therefore characteristic of the Schizopoda. 



We are not aware that any similar formation has been observed in 

 other groups of Crustacea. 



In the other species, however, the disposition and number of thèse 

 ridges is slightly différent, fig. 47. 



In some species there are more than one in each tube; we shall point 

 out the différences in treating of the other species. 



Frey (') imagined that he had found two kinds of cells in Macromysis 

 flexuosa, but from his description he could not hâve seen the above forma- 

 tions of elongated cells. 



"Memoratu dignum est", he says, »in nostro quoque animalculo ut 

 in Decapodibus duo cellarum gênera inveniri, inter quse rarissimse tantum 

 transitus observatur. Unum genus, nucleo granuloso instructum e cellulis 

 constat quse materia.m adiposam sub guttularum forma continet. Alterum, 

 quod multo quidem rarius invenitur nucleo Isevi et tenerrimo proditum, 

 sparsim inter cellulas supra commemoratas percipitur. » 



The first cells, of which he speaks, are those which are in full progress 

 of secreting, containing large vésicules of proteid matter which when seen 

 for the first time hâve a striking ressemblance to granular nuclei, fig. 45 

 and 49. 



The intestine. 



The intestine in the Schizopoda is very thin, and without convolutions. 

 Leaving the pyloric chamber it gradually descends in the thorax in a 

 curved Une beneath the sexual glands and the three pairs of dorsal tubes 

 of the digestive gland, fig. 1. 



Not far from the extremity of the thorax it gradually rises again in a 

 curved Une, and runs above the muscular masses of the pleon, close to the 

 dorsal integument, in a straight line as far as the anus on the ventral sur- 

 face of the telson. 



The epithelium of the intestine is covered by a thin chitinous mem- 



(I) Frey : Loco citato. 



