THE CEPHALOTHORAX. 



153 



which lie immediately in front of the hindermost, there 

 is a small round aperture for the attachment of the 



XIV 



FIG. 39. Agtacu* jlu-viatilix. The cephalothoracic sterna and the endo- 

 phragmal system ( x 2). A, from beneath ; , from above, #, ', 

 arthrophragms or partitions between the articular cavities for the 

 limbs ; c.ap, cephalic apodeme ; ct\ cervical fold ; epn. 1, epimeron of 

 the antennulary somite ; h, anterior, and A', posterior horizontal 

 process of endopleurite : Ib, labrum : w, mesophragm ; mt, meta- 

 stoma : p, paraphragm ; 1 XIV, cephalothoracic sterna ; 1 14, 

 articular cavities of the cephalothoracic appendages. (The anterior 

 cephalic sterna are bent downwards in A so as to bring them into 

 the same plane with the remaining cephalothoracic sterna ; in B 

 these sterna are not shown.) 



