1G8 



ZOOLOGY 



SECT. 



The mouth is situated at the end of a short manubrium (mnl>.) leading into a 

 wide stomach, from which go off four very broad per-radial pouches (rad. p-), 

 occupying the whole of the four fiat sides of the umbrella, and separated from one 

 another by narrow inter-radial septa or partitions placed at the four corners. 

 These pouches are equivalent to wide radial canals, and the partitions between 



gon. 



B 



end lam 



arc. 



cul.fi 



.yon 



rrtnL 



FIG. 120. Cnarybdsea marsupialis. A. side view of the entire animal ; B. vertical section 

 passing on the left side through an inter-radius, 011 the right through a per-radius ; 

 C, transverse section ; </',<. <. circular canal ; < </</. ln.m. endoderrn lamella ; /"/. Inm'. its pro- 

 longation into the velarium; (i. /. gastric filaments; ;i<>,>. gonacl ; <//>'. septum separating 

 gonads ; !. lappet; >in>li. rnaiiuliriuni ; /</.;>. radial pouch; t. tentacle; ti: tontaculocyst ; 

 ?/. velarium. (After Glaus, somewhat altered.) 



them to a poorly developed endoderm lamella (m<1. 7a/.). At the margin of 

 the umbrella the pouches communicate with one another by apertures in the 

 septa, so that a kind of circular canal is produced (r/'/r. <.). JJear the junction 

 of the gastric pouches with the stomach are the usual four groups of gastric 

 filaments (;/. f. ). 



The gonads (r/on.) are four pairs of narrow plate-like organs, attached one 

 along each side of each inter-radial septum. The nervous system takes the form 



