DECAPODA. 205 



they are equal. The second feet of the Egeones are shortei- tlian the 

 third and the smallest of the whole number, whilst in Crangon their 

 length is the same. Besides, as the number of species is very 

 limited, this generic distinction becomes the less necessary. 



C. vulgaris. Fab, ; Roes., Insect., Ill, Ixiii, 1,2, (The Slirimp), 

 about two inches long. It is smooth, of a pale glaucous green, 

 dotted with grey. That part of the thorax which supports the 

 third pair of feet projects in a point. This species is very com- 

 mon on the oceanic coast of France, where it is vulgarly called 

 the Cardan. It is taken there annually in nets. Its flesh is deli- 

 cate, and highly esteemed. In the same locality, though rarely, 

 according to M. Brebisson, is found the C. ponctue de rouge, of 

 Risso ; but I consider it, with him, as a mere variety. The C. 

 loricatus — Egeon loricatm, Risso ; Cancer cafaphractu^, Oliv. , 

 Zool., Adriat,, III, 1, has three longitudinal and dcntated ridges 

 on the thorax. 



Northern seas produce a large species, the Crangon horeas, 

 Phipps., Voy. to the North Pole, pi. xi, 1, Herbst. XXiX, 2. 



Processa, Leach. — Nika, Risso. 



One of the tv/o anterior feet simply terminating in a point, the 

 other in a didactyle claw ; the two following are unequal, slender, 

 and also didactyle, One of these second feet is very long, its carpus 

 and the preceding joint being annulated, a character which on the 

 other foot is only found in the first of these joints. l"he fourth pair 

 of feet are longer than the preceding and two following ones. The 

 superior antennae have but two threads. 



P. edulis ; Alka edulis, Riss., Crust., Ill, 3, is of a flesh colour 

 dotted with yellowish; a line of small yellow spots in. the middle. 

 The anterior extremity of the shell is furnished with three 

 sharp points, the intermediate of which, or the rostrum, is the 

 longest. The two anterior feet are equal in size, the right one 

 forming a forceps. This species is fovuid during the whole year 

 in the markets at Nice. It is also found on the coast of the 

 department of France, called the Uouches-du-Rhone *. 



Hymen'ocera, Latr. 



The two anterior feet terminated by a long hook with a bifid ex- 

 tremity, and composed of very short divisions. The two following 

 are very large; the hands, immoveable finger, and superior thread of 

 the intermediate antennae are dilated, membranous, and almost foli- 

 aceous. The external foot-jaws are equally foliaceous, and cover the 

 mouth. 



The only species known is in the collection of the Museum 

 d' Histoire Naturelle, and was captured in the Indian Ocean. 



* For the reuiiiining species, see Risso, Hist. Nat. des Crust, de Nice ; Leach, 

 Malac. Bi-it., XLI ; and the Nouv. Diet. d'Hist. Nat., Ed. II. 



