C0R0PHIID2E. 
452 
A UP HIP OB A POBOCERIDES. 
NAT A TORI A. 
Genus— CERAPUS. 
Cerapus. 
Ericthonius. 
Cerapodina. 
Pyctilus. 
Say, Journ. Acad. Philad. i. p. 49. Desmarest, Consid. sur 
Crust, p. 271. Milne Edwards, Ann. des Sci. Nat. 
xx. p. 382. Templeton, Trans. Ent. Soc. i. p. 188. White, 
Pop. Hist. Brit. Crust, p. 189. Gosse, Mar. Zool. i. 
p. 140. Spence Bate, Cat. Aniph. Brit. Mus. p. 262. 
Milne Edwards, Ann. des Sci. Nat. t. xx. p. 383. Hist, des 
Crust, t. iii. p. 59. Spence Bate, Rep. Brit. Assoc. 1855, 
p. 59. Ann. Nat. Hist. 2 ser. xix. p. 149. White, Pop. 
Hist. Brit. Crust, p. 196. 
Milne Edwards, Hist, des Crust, iii. p. 62. 
Dana, United States’ Explor. Exped. p. 973. 
Generic character. Body not laterally compressed. Coxae 
not so deep as their respective segments of the body. Antennae 
subequal : superior pair furnished with a secondary appen- 
dage; inferior antennae having the flagellum multi-articu- 
late. First pair of gnathopoda subchelate : second pair of 
gnathopoda large, complexly subchelate. Posterior pair of 
pleopoda unibranched. Telson rudimentary, supporting nu- 
merous small, sharp points. 
In this genus the body of the animal is not deep 
or laterally compressed. The antennae are nearly of the 
same length, although the lower are the more powerful 
pair of organs. The flagella are multi-articulate. The 
first pair of hands are simply subchelate ; the second 
pair have the wrist largely developed and inferiorly pro- 
duced so as to antagonize at its extremity with the apex 
of the finger. All the walking legs have the thighs 
equally dilated. The posterior pair of caudal append- 
ages are single-branched, and the middle piece is bilobed, 
each lobe being studded with minute, sharp, anteriorly- 
directed teeth. 
