AET. 9 NEW PARASITIC CRUSTACEA NIERSTRASZ AND BRANDIS 7 



netlike appearance, caused by the eggs in the brood pouch. The 

 largest specimen is 4 mm. long (between a and &, fig. 15). 



Regarding the internal organization, the following can be said: 

 The intestine (I) is poorly developed; only a portion of it is present, 

 opening through the oral incision. Distally it is closed. To the left 

 and right of the intestine lies a lobe (L) of the ovary; at some dis- 

 tance beyond the closed extremity of the intestine, these lobes unite 

 to form the unpaired part of the ovary (O). At one side (the 

 ventral side?) the ovary shows two processes (G), lined with large 

 epithelial cells. Their inner surface is covered with a cuticle. They 

 are in communication with the unpaired part of the ovary, being 

 shut off from the rest of the body. The remainder of the body is 

 occupied by the very large brood pouch. 



According to van Kampen and Boschma, Duplorbis (p. 59) be- 

 longs to the Rhizocephala and in nearly all respects, in shape as 

 well as in structure, our animal corresponds with that genus. Of 

 Duflovhis two species are known, namely, D. calathv/rae Smith and 

 D. smithi Nierstrasz and B render a Brandis. 



These three forms each have two oviducts by means of which 

 the ripe ova pass from the ovary into the brood pouch. In D. 

 ocammAi^ however, we have not been able to trace this communica- 

 tion. We might consider the two appendices (G) as oviducts, but 

 these bodies do not appear to be in communication with the brood 

 pouch. Notwithstanding this, we are inclined to regard them as 

 oviducts, particularly as their internal surface is lined with a cuti- 

 cle. As the brood pouch is filled with embryos, there must have 

 been some connection with the ovary, and in our opinion, at least, 

 through the processes referred to above. They probably close after 

 the passage of the eggs, to reopen when the ovary is again ripe for 

 the next periodical set of ova. 



APOCEPON, new genus 



For generic characters we have: Female: Pleural lamellae on 

 abdominal segments I-V; lamellae elongate, and digitate (princi- 

 pally on caudal margin) ; exopods of pleopods long and digitate; 

 endopods very short (rudimentary) and smooth; without medio- 

 dorsal bosses on peraeon or pleon. Male : Pleotelson markedly bifur- 

 cate ; no rudiments of pleopods or uropods present ; no medio-ventral 

 bosses. 



This genus is closely allied to Trapezicepon ^ and maybe to Leidya, 

 in so far as the endopods (of the pleopods) of the latter are rudi- 

 mentary^, which can not be clearly made out in reading Leidy's de- 



1 Bonnier, J. : Contribution a I'Stude des Epicarides. Les Bopyridae. Paris, 1900, p. 269. 



