172 CRUSTACEA. L.KMODIPODA. 



FAMILY I. OVALIA. 



Body oval, with the segments transverse ; feet strong and of 

 medium length ; those of the second and third segments im- 

 perfect, and terminated by a very long, cylindrical and blunt 

 joint, with an elongated vesicle at the base of each. 



Gen. 1. CYAMUS, Lat, 



Head small, short, conical and truncated ; body broad, orbicu- 

 lar, depressed, and crustaceous, of ten segments ; eyes com- 

 pound, slightly projecting, anterior and lateral ; antennae 

 slightly setaceous, of four joints; eight unguiculated and joint- 

 ed feet, and two pairs of spurious ones on the second and 

 third segment, to which the branchial vesicles are attached. 



C. ceti, Lat. (Oniscus ceti, Pall.) Inhabits European seas, on the 

 skin of whales. Savigny, Mem. fas. i. pi. 5. fig. 1. 



FAMILY II. FILIFORMIA. 



Body long and linear, with the segments narrow and longitudi- 

 nal ; feet long and slender ; fourth or last portion of the up- 

 per antennae jointed. 



Gen. 2. CAPRELLA, Lam. Cancer, Lin. 

 Four antennae, the two superior ones longest ; two sessile com- 

 pound eyes ; body elongated, linear or filiform ; tail very 

 short ; second and third segments destitute of feet ; two an- 

 nexed to the head, didactyle ; two on the first segment, the 

 others on the fourth, fifth, and sixth segments, long, slender, 

 and unguiculated ; second and third segments with vesicles. 



C. acutifrons, Lat. Head oval; front pointed; inferior antennae 

 ciliated ; first segment of the body cylindrical, not thicker than 

 the head, and supporting the second pair of feet. Inhabits coasts 

 of Britain. Desm. Crust. 277. 

 M. Latreille regards as belonging to this genus the C.Jttifonms of Linnaeus, and 



a crustaceous animal described by Forskhal as the larva of an insect of an uncertain 



genus. 



Gen. 3. PROTO, Leach. 



Ten feet disposed in a continued series from the head to the 

 fourth segment ; the body terminated by three joints, which 

 form a kind of tail ; an appendage at the base of the second 

 and two following pairs of feet ; females with the ova under 

 the second and third segments, in a sac formed of approxi- 

 mated scales. 



P. pedatum, Desm. (Squilla pedata, Mull.) Inhabits the coasts of 

 France, on sponges brought up by the dredge. Desm. Crust. 276'. 



Gen. 4. LEPTOMERA, Lat. Lam. 



Fourteen slender feet disposed in a continued series from the 

 head to the posterior extremity of the body. 



