THE CEPHALOTHORAX. 



153 



which lie immediatel}- in front of the hindermost, there 

 is a small round aperture for the attachment of the 



lav 



Fig. S9.— Asfiwi/s fliiviatiUii.— The ceYiha\ot\ioYacic sterna and the endo- 

 phragmal system ( x 2). ^1, from beneath ; B, from above, a, ii', 

 arthrophragms or partitions between the articular cavities for the 

 limbs ; e.flfj^, cephalic apodeme ; cf, cervical fold ; cjni. i,epimeronof 

 the antennulary somite ; ?i, anterior, and h', posterior horizontal 

 process of endopleurite : lb, labrum ; m, mesophragm ; mt, meta- 

 stoma ; ^7, 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.) 



