i68 REPORT OF NEW JERSEY STATE MUSEUM. 



These animals are usually found among algae or hydroids 

 to which they cling firmly by means of their powerfully developed 

 posterior peraeopoda. Easily known by the long narrow cylin- 

 drical flexible body which may be bent to a complete circle. 

 Genera about ten. 



Genus CAPRELLA Latreille. 

 The Skeleton Shrimps. 



Caprella (Lamarck) Latreille, Hist. Nat. Crust., IH, j802, p. 39. Type Cancer 



linearis Linnaeus, first species, designated by Boeck, Skand. Ark. Amphi- 



poder, 1872, p. 686. 

 Liparis (nee Scopoli 1777) Bosc, Hist. Nat. Crust., L 1802, p. 79. Type 



Squilla lobata Fabricius, monotypic. 

 Capreola De Brebisson, Cat. Crust. Calvados, 1825, p. 225. Type Caprella 



scolopcndroides Lamarck, virtually monotypic. 



Body more or less slender, usually nutch more elongated in 

 adult male than in female, with anterior part sometimes enor- 

 mously prolonged. Cephalosome of moderate length, with dis- 

 tinct dorsal impression, indicating boundary between cephalon 

 and first segnnent of mesosome. Superior antennae more or less 

 elongated, with joints of peduncle in male often lamellarly ex- 

 panded. Inferior antennae generally densely setous posteriorly, 

 with flagellum biarticulate. Mandibles without any palps. Max- 

 illipeds with masticatory lobes scarcely larger than basal ones, 

 palps very strong. Anterior gnathopoda of usual structure. Pos- 

 terior gnathopoda strongly developed, often very differently 

 shaped in both sexes. Two anterior pairs of peraeopoda quite 

 wanting, three posterior pairs of equal structure and generally 

 very strongly built, subcheliform. Branchial lamellae only present 

 on third and fourth segments of mesosome. Urosome in female 

 without distinctly defined appendages, in male w'ith pair of bi- 

 articulate limbs in front. 



Many species have been described, though the great sexual 

 differences have been found to be the onlv excuse in manv cases. 



