666 CLASS X. 
Mippolyte Leacn. Middle antenne superior, with two sete, the 
external seta excavated beneath, external antenne with a lamel- 
lose appendage elongate, obtuse, and a long multiarticulate seta. 
Shell carinate, supplied anteriorly with a serrated frontal rostrum. 
Third pair of maxilliform feet narrow, mostly furnished with a 
pilose palp at the base. ive pairs of feet, the two anterior didac- 
tylous. Abdomen gibbous, with third segment large, fourth in- 
flected beneath, and incurved. 
Sp. Hippolyte Sowerbyi Leacu, DesMAR. Crust. Pl. 39, fig. 1, &c. Compare 
on this genus H. Kroryer in Kongel. Danske Vidensk. Selsk. naturv. og 
math. Afh. 1X. 1842, pp. 209—360. 
Rhynchocinetes Epw. 
Gnathophyllum Latr. 
Alpheus FAsr. 
Pontonia LAtr. 
Sp. Pontonia tyrrhena Latr., Alpheus pinnophylax Orto, Nov. Act. Acad. 
Ces. Leop. Carol. x11. 1828, Tab. xxt. figs. 1, 2. 
Add genera: Athanas Lracu, Nika Risso, Atya Leach and some 
others, on which see Mitne Epwarps, Hist. nat. des Crust. 1. 
pp: 347—366. 
Crangon Fase. Four antenne inserted almost in the same 
plane, dilated at the base, terminated by a double filament. Shell 
depressed, with a very short anterior process. Five pairs of feet 
P ’ y; I I ) 
first pair thicker than the rest, subdidactylous, with internal finger 
very short, immoveable. 
Sp. Crangon vulgaris Fasr., Cancer crangon L., Rasen Ins. 111. Tab. 63, 
Baster Natuurk. Uitsp. 1. Tab. m1. figs. r—4, Ta. Bunn Brit. Crust. 
p- 256. The Shrimp, crevette ; attains a length of fully 2” ; the second pair 
of feet is about as long as the third ; this species is very common on our 
shores, and well known on account of the agreeable taste of its flesh. In 
some other species the second pair of feet is very short. They form the 
genus Egcon Risso, Pontophilus LEACH. 
Add genera: Sabinea OwEn, Argis KRorver. 
Compare KRoEYER Tidsskr. Iv. 1842, pp. 267, 268. 
1 A History of British Crustacea, by TH. Bett. London, 1844 to 1848, 8vo. (only 
VI. parts have yet appeared ; this work contains very beautiful wood-cuts). 
