REPORT ON THE AMPHirODA. 1157 



Geuus Cera/pus, Say, 1S17. 



1817. Cerapus, Say, Journ. Acad. Nat. Sci. Philad., vol. i. pt. i. p. 49. 

 1823. „ Desrnarest, Diet. d. Sci. Nat., t. xxviii. p. 358 (S. I. Smith). 

 1825. „ Desrnarest, Consid. gen. sur la classe des Crustac^s, p. 271. 



1829. „ Latreille, Le Regne Animal, t. iv. p. 122. 



1830. „ Milne-Ed wards, Ann. d. Sci. Nat, t. xx. p. 383 (cxtr. p. 32). 

 1836. „ Ti'inpleton, Trans. Entom. Soc. Lond., vol. i. pt. iii. 



1838. „ Milne-Edwards, Hist. Nat. des Anim. sans vertebres, t. v. 



1840. ,, (2Jars), Milne-Edwards, Hist, des Crust., t. iii. p. GO. 



1840. Cerapodina, Milne-Edwards, Hist, des Crust., t. iii. p. 62. 



1843. 1 Cempus, Kr0yer, Naturh. Tidsskr., E. 1, Bd. iv. p. 494 (footnote). 



1849. Cerapodina, Dana, Amer. Journ. Sci. and Arts, ser. 2, vol. viii. p. 139. 



1849. Cempus, Dana, Amer. Journ. Sci. and Arts, ser. 2, vol. viii. p. 139. 



1852. ,, Dana, Amer. Journ. Sci. and Arts, ser. 2, vol. xiv. p. 309 ; U.S. Explor. Exped., p. 832. 



1852. Cerapodina, Dana, Amer. Journ. Sci. and Arts, ser. 2, vol. xiv. p. 309; U.S. Explor. Exped., p. 832. 



1857. Cerapus (pars), White, Popular History of British Crustacea, p. 189. 



1862. ,, (pars), Spence Bate, Brit. Mus. Catal. Arnph. Crust., p. 262. 



1862. Siplwimcetes (pars), Bate and Westwood, Brit. Sess. Crust., vol. i. p. 469. 



1874. Cerapus (pars), S. I. Smith, Invert. Anim. Vineyard Sound, p. 565 (271). 



1880. „ S. I. Smith, Trans. Connect. Acad., vol. iv. p. 277. 



1882. „ Sars, Oversigt af Norges Crustaceer, pp. 31, 113. 



1885. ,, (pars), Carus, Prodromus Faunae Mediterraneae, pars ii. p. 393. 



1885. Cijrtophmm, Giles, Journ. Asiatic Soc. Bengal, vol. 54, pt. ii. p. 55. 



For original definition of the genus, see Note on Say, 1817 (p. 100). Boeck's 

 definition is inapplicable, being based in fact on species of the neighbouring genus 

 Ericthonius, Milne-Edwards. In connection with those already given for the family (and 

 subfamily), the following characters may suffice for the genus : — 



Mandibles with the third joint of the palp nearly or quite equal in length to the 

 second. 



First Maxillse with the inner plate small. 



Maxillipeds with the palp elongate, having its fourth joint armed with an ungual 

 spine. 



Antennas subequal in length, both pairs stout, with short flagella. 



Second Gnathopods in the male much stronger than the First, having the wrist much 

 larger than the hand. 



First and Second Perseopods with the first joint much dilated. 



Third and Fourth Pei-geopods with the terminal joints reversed. 



Pleopods without cleft spines on the first joint of the inner ramus. 



Second Uropods uniramous. 



Telson bilobed. 



1 The genus Lusyta, Nardo, 1847 (see Note on Nardo, 1869, p. 390), is probably a synonym of Ericthonius rather 

 than of Cerapus. 



