CRUSTACEA. 665 
Peduncle of lateral antenne entirely covered by a large scale. 
Body compressed, with post-abdomen incurved. Integuments thin, 
almost membranous. 
Acetes Eyw. Maxilliform feet in two pairs. Only four pairs of 
feet of trunk, the last two pairs being deficient; all filiform, long, 
none didactylous. 
Sp. Acetes indicus EDwarps, Ann. des Sc. nat. XIX. 1830, p. 350, Pl. x1. 
fig. 1. 
Sergestes Epw. Maxilliform feet in two pairs. Feet of trunk 
in six pairs, filiform, slender, last pair very small, none didactylous. 
Sp. Serg. atlanticus MILNE Epwarps, Ann. des Se, nat. xix. Pl. x. fig. 1. 
Peneus Fasr. Feet slender, furnished with a palpiform lamel- 
lose appendage at the base; three anterior pairs armed with a small 
didactylous chela. Lateral antenne very long. Shell carinate. 
Sp. Peneus sulcatus, Palemon sulcatus Ouiy., Epw. Hist. nat. des Crust. 
Pl. 25, fig. 1 ;—Peneus trisulcatus LEACH, DESMAR. Crust. PI. 30; fig..3 = 
Peneus setiferus, Cancer setiferus L., SEBA Theswur. 11. Tab. 17, fig. 2 
(copied in Zneycl. méth., Crust. Pl. 291, fig. 2) &e. 
Add genera: Sicyonia Epw., Huphema Epw., Stenopus Larr., 
Aristeus DUVERNOY. 
Ephyra Roux. 
Pasiphea Savieny. (In these and the following genus only two 
anterior pairs of feet are didactylous.) 
Oplophorus Evw. 
Palemon Daup., Fasr. Middle antenne superior, with three 
sete. Shell carinate in the middle, keel produced anteriorly into 
a recurved serrated rostrum. Feet of trunk in five pairs, without 
palp or lateral appendage ; two anterior pairs didactylous. 
Sp. Palemon squilla Fasr., Cancer squilla L., BAsteR Natuurk. Uitspann. 
u. Tab. mi. fig. 5, GuéRIN Iconogr., Crust. Pl, 22, fig. 1; the praun 
(stewrkrab, crevette, salicocque) &c. A fossil species, from the lithographic 
stone, Palemon spinipes, of which Basrr (Oryctogr. Norica. 1758, Tab. 
vit. Suppl. fig. 9) and WatcH and Knorr have given figures, the last of 
which is copied by DesmarEst Crust. fossiles, Tab. XI. fig. 4, appears to 
stand between Palemon and Sergestes and has long spines on the fore feet. 
Add genera: Pandalus Lracn, Lysmata Risso. 
