242 REPORT O'F NEW JERSEY STATE MUSEUM. 



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

 abundant, associated with Gammariis fasciatus and Notonectes, 

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

 of the same name. 



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

 Pakvnwnetes vulgaris, Gammarus fasciatus, Planorhis trivolvis, 

 Physa heterostropha, Somato gyrus altilis, Unio coniplanata and 

 Anodonta cataractcc, the niollusca identified by Mr. E. G. Van- 

 atta. 



Super-Family BOPYROIDEA. 



Female. — O'ften conspicuously asymmetrical, even when body 

 segmentation is apparent. In latter case three chief divisions, 

 as cephalon, mesosome and metasome may be distinguished, 

 though each not very sharply defined. Cephalon generally car- 

 ries in front two pairs of rudimentary antennre, 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 larg-e, 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 



