112 AMPnirODA NORMALTA. 



think tlio genus to be very closely allied to, if not sjmonjmous with, 

 SuJrator, in wliicli case tlio finger is the honiologiie of tlio propodos, 

 and the thumb is formed by the inferior portion of the produced and 

 dilated carpus. In this I am confirmed by the " remaining feet " 

 being destitute of a dactylos (nail). 



1. Lepidactylis ditiscus. 

 Lepidactylis ditiscus, Sai/, Proc. PhiUul. Acad. vol. i. pt. 2. 



" Male. — Eyes orbicular. Body white, Superior antennae having 

 the secondary appendage attaining the tip of the foui'th joint of 

 the flageUum. First pair of gnathopoda hairy. 



" Length : male |, female ^ths of an inch. 

 ''Hab. Georgia, U.S."— /Sa*/. 



28. SULCATOR. 



Sulcator, Spcncc Bate, Ann. Nat. Hist. vol. xiii. p. 504, 1854. 

 Bellia, Sjmice Bate, Ann. Nat. Hist. vol. vii. p. 318, 1851. 



Cephalon produced anteriorly. Pleon having the three posterior 

 segments bent beneath and enclosed within the third. Superior 

 antennae with a secondary appendage. Coxae large. Gnathopoda 

 scarcely subchelate, having the dactylos small in the first and 

 rudimentary in the second. Pereiopoda ha\'ing the dactylos obso- 

 lete. Two anterior pairs of pereiopoda having the carpus and 

 propodos dilated ; three anterior pairs of pleopoda short ; posterior 

 pair of pleopoda biramous. Telson single, deeply divided. 



1. Sulcator arenarius. (Plate XYIII.) B.M. 



Sidcator arenarius, Spence Bate, Ann. Nat. Hist. 1854 ; Bejmii Brit. 

 Assoc. 1855 ; Si/nops. Ann. Nat. Hist. Feb. 1857 ; Trans. Tyticsicle 

 Nat. Field aub, vol. iv.pt. 1. p. 15. pi. 2. f. 2, 1858. 

 Gosse, 3Iarine Zoology, p. 142. f. 264. 

 White, Hist, of Brit. Crust, p. 174. 

 BeUia areuaria, Spence Bate, Ann. Nat. Hist. vol. vii. p. 318, 1851. 

 Dana, U.S. Hj-plor. Exped. Crust, p. 912. 



Cephalon produced into a small flat rostrum. Pereion smooth ; third 



segment of the pleon longer than the preceding ; the three posterior 



segments rcflexed, and enclosed beneath the third. Eyes small, 



round, cream-coloiu'ed. Superior antennae having the peduncle 



longer than the flageUum ; secondary appendage nearly as long as 



the primary; peduncle studded with plumose cilia. Inferior antennae 



having the fourth and fifth segments dilated beneath, compressed, 



ciliated with plumose hairs ; flageUum not so long as the last two 



joints of the peduncle. Mandibles having the second and third joints 



of the appendage long, subequal ; third tipped ^vith long cylindrical 



