242 REPORT O'F NEW JERSEY STATE MUSEUM. 



Cape May Court House. On October 14th it was exceedingly 

 abundant, associated with Ganiuiants fasciatus and Nofonectcs, 

 in the fresh-water ditches tributary to Dias Creek near the vihage 

 of the same name. 



On December 2d, 191 1, it was common at Bridgeton with 

 Pal^mouefes z-nlgaris, Gamiiwrus fasciatus, Planorbis trivohis, 

 PJiysa heterostropha, Soiuatogynis altilis, Unio complanata and 

 Anodonta cataractcr, the mohusca identified by Mr. E. G. Van- 

 atta. 



Super-Family BOPYROIDEA. 



Fenialc. — Often conspicuously asymmetrical, even when body 

 segmentation is apparent. In latter case three chief divisions, 

 as cephalon, mesdsome and metasome may be distinguished, 

 though each not very sharpl\^ defined. Cephalon generally car- 

 ries in front two pairs of rudimentary antennne. and produced 

 below to conic prominence exhibiting on tip of oral aperture. 

 Oral parts much reduced, only mandibles and maxillipeds dis- 

 tinctly developed, with former styliform and converging- to oral 

 orifice, and latter lamelliform. Legs, when present, all alike, 

 prehensile, terminating in a minute hand. Pleopoda sometimes 

 rather large, all branchial in character, while in larvse natatory. 

 Uropoda, when present, always very small and simple, not form- 

 ing with last segment a caudal fan. 



Male. — Of diminutive size, and generally found clinging to 

 genital region of female like a parasite. Appearance also very 

 different from that of female, retaining several larval characters, 

 and sometimes not differing from last larval stage except by 

 presence of generative organs. 



Remarks. — Parasitic forms, found on other Crustacea of dif- 

 ferent orders. They represent the most degraded isopods, some- 

 times the fully-grown female being a simple sac filled with ova, 

 without any trace of segmentation or of limbs. All forms show 

 a more or less pronounced regressive metamorphosis, comprising 

 at least two distinct larval stages, very dissimilar in both general 

 appearance and in structure of the several appendages, and equally 



