666 CLASS x. 



Hippolyte LEACH. Middle antennae superior, with two setae, the 

 external seta excavated beneath, external antennae 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. Five pairs of feet, the two anterior didac- 

 tylous. Abdomen gibbous, with third segment large, fourth in- 

 flected beneath, and incurved. 



Sp. Hippolyte Sowerbyi LEACH, DESMAR. Crust. PI. 39, fig. i, &c. Compare 

 on this genus H. KROEYER in Kongel. Danske VidensTc. SelsJc. naturv. og 

 math. Afh. ix. 1842, pp. 209 360. 



RliyncJwcinetes EDW. 

 Gnathophyllum LATR. 



Alpheus FABR. 

 Pontonia LATH. 



Sp. Pontonia tyrrhena LATH., Alpheus pinnophylax OTTO, Nov. Act. Ai 

 Cces. Leop. Carol, xn. 1828, Tab. xxi. figs, i, 2. 



Add genera : Athanas LEACH, Nika Risso, Atya LEACH and some 

 others, on which see MILNE EDWARDS, Hist. nat. des Crust, n. 

 pp. 347366. 



Crangon FABR. Four antennae 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, 

 first pair thicker than the rest, subdidactylous, with internal finger 

 very short, immoveable. 



Sp. Crangon vulgaris FABR., Cancer crangon L., RCESEL Ins. in. Tab. 63, 

 EASTER Natuurk. Uitsp. u. Tab. in. figs, r 4, TH. BELL Brit. Crust. 1 

 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 Egeon Eisso, Pontophilus LEACH. 



Add genera : Sabinea OWEN, Argis KROEYER. 

 Compare KROEYER Tidsskr. iv. 1842, pp. 267, 268. 



1 A History of British, Crustacea, byTn. BELL. London, 1844 to 1848, 8vo. (only 

 VI. parts have yet appeared ; this work contains very beautiful wood- cuts). 



