DECAPODA. 205 



they are equal. The second feet of the Egeones are shorter than the 

 third and tin- 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. tnifyam, Fab. ; Roes., Insect., Ill, Ixiii, 1,2, (The Shrimp), 

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

 dotted with gn-y. That part of the thorax which supports tin- 

 third p:iir of fe,-t projects in a point. This species is very com- 



non tin IT.-!, ic coast of where it is vulgarly called 



It is t-ikm there annually in nets. Its ile.sli is deli- 

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

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

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

 loricalus Egeon loricatus, Risso ; Cancer cataphractu*, Oliv. , 

 Zool., Adriat., Ill, 1, has three longitudinal and dentated ridges 

 on the thorax. 



Northern seas produce a large species, the Crangon boreas, 

 .. Voy. to the North Pble; pi. xi, 1, Herbst. XXIX, 2. 



PROCESSA, Leach. NIKA, Risso. 



One of the two 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 annulatcd, a character which on the 

 other foot is only found in the first of these joints. The fourth pair 

 t are lunger than the preceding and two following ones. The 

 superior antennae have but two threads. 



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

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

 Tin- 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 arc equal in size, the right one 

 ling a forceps. This species is found during the whole year 

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

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



HYMENOCERA, Lair. 



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 remaining specie!*, see Risso, Hist. Nat. des Crust, de Nice ; Leach, 

 Malac. Brit., XLI ; and the Nouv. Diet. d'Hist. Nat., Ed. II. 



