172 REPORT OF NEW JERSEY STATE MUSEUM. 



Genus CERAPUS Say. 



Cerapus Say, Jouni. Acad. Nat. Sci. Phila., I, pt. i, 1817, p. 49. Type Cerapus 



tiibiilaris Say, monotypic. 

 Cyrtophium Giles, Journ. As. Soc. Bengal, LIV, pt. 2, 1885, p. 54. Type 



Cyrtophiuiii calaiiiicola Giles, monotypic. 



Body slender, .sublinear. with metasonie and iirosome very 

 small. Cephalon produced in front to well-marked rostrum. 

 Anterior pairs of coxal plates exceedingly small, three posterior 

 pairs considerably larger and distinctly bilobed. Eyes distinct, 

 but small. Antennse not very slender, subequal in length, superior 

 ones without an accessory appendage, but have first joint of 

 peduncle more or less greatly expanded, and flagella in both pairs 

 very short. Mandibular palps well developed, triarticulate, with 

 terminal joint fully as large as second, and edged with long curved 

 setse. Anterior gnathopoda of similar structure in two sexes, 

 and distinctly subcheliform. Posterior gnathopoda in female 

 scarcely stronger than anterior, not subcheliform, those in male 

 very powerfully developed with carpus exceedingly large and 

 more or less produced below so to form together with propodus 

 and dactylus complex chela. Anterior pairs of per^eopoda sub- 

 equal, basal joint large and broad, and three posterior pairs com- 

 parativel}' short and strongly recurved, with dactylus small and 

 inverted. Branchial lamellae narrow% only present at base of three 

 middle pairs of legs. Three anterior pairs of incubatory lamella? 

 likewise narrow, and fourth pair, however, large and expanded, 

 closing marsupial pouch posteriorly. First pair of pleopoda 

 rather large, and two succeeding pairs imperfectly developed. 

 Penultimate pair of uropoda uniramous, and last pair with 

 terminal joint extremely small and hooked-shaped. Telson short 

 and broad, slightly bilobed, upper face densely spinous. Specie- 

 few. 



Cerapus tubularis Say. 



Pl.xte 51. 



Tube Shriuip. 



Cerapus tubularis Say, Journ. Acad. Nat. Sci. Phila.. I, pt. i. 1817. p. 50, PI. 

 . 4, figs. 7-TT. Amongst fuci on the sea beach at Egg Harbor. Neiv Jersey. 



