APPENDIX. 



AMPHIPODA. 



NATATORIA. 



513 



GAMMARILES. 



{Vol. l.ii. 847 *) 



Genus— CHEIROCRATUS. {Norman.) 

 Trans. Nat. Hist. Soc. Northumberland and Durham, vol. i. p. 12. 



Generic character. Long and slender. Segments of tlie pereion 

 and pleon subeqnal. Ej-es round. Antennae subequal ; peduncle 

 of the superior sbo)ter than the peduncle of the inferior; furnished 

 with a secondary appendage. Mandibles having a long appendage. 

 Gnathopoda unequal: first pah* simple; second pair long, large, 

 and robust. Posterior pair of pereiopoda longer than the preceding. 

 Posterior pair of pleopoda long and unibranched. Tebon double. 



CHEIROCRATUS MANTIS. 



Siiecific character. Dorsal surface of the fourth segment of the pleon 

 produced ijosteriorly into a short central and a long lateral tooth on each side, 

 the space between being occupied by a long cilium. Fifth segment resembling 

 the fourth, but having the teeth less important and tlie cilium absent. 



Length, nearly half an inch. 



Cheirocratiis mantis. Norman, op. cit. vol. i. p. 13, pi. vii. figs. 14, 15. 



The superior antennre about the length of the cephalon 

 VOL. II. L L 



