DECAPODA. 25 



P. puber, Fab.,: Cancer puber, L.; Ptnn. Brit. Zool.,IV,iv, 8; 

 Herbst., VII, 59; Leach, Malac. Brit., VI. Covered with a 

 yellowish down; eight small teeth between the eyes, the two 

 middle ones longest, obtuse and divergent; claws sulcated, armed 

 with a stout dentated tooth on the inner side of the carpus, and 

 from one joint to the following one or the hand; fingers blackish. 



This species is usually called in France, where its flesh is 

 considered a delicacy, VEtr'dle. 



P. corrugatus; Cancer corrugatus, Penn. Brit. Zool., IV, 

 pi. v, 9; Leach, Malac. Brit., VII, 1, 2. The shell rugose, 

 covered with a yellowish down, and furnished with three equal, 

 and almost lobuliform teeth in front; the three posterior teeth 

 of the lateral margins very sharp and spiniform. 



P. mamas; Cancer mccnas, L., and Fab. This common spe- 

 cies of the French coast, called Crabe enrage, appears to me 

 to belong to the Portuni, rather than to the Crabs properly so 

 called; its posterior fins are only somewhat narrower. Such was 

 the first opinion of Dr Leach, who subsequently made a peculiar 

 genus for it called Carcinus, (Malac. Brit., XII, tab. v). It 

 also has five teeth on each side, and a similar number in front, 

 the internal oculars included. The top of the shell is glabrous, 

 finely shagreened, with deeply impressed lines. The tarsi are 

 striate; the upper edge of the hand is so compressed as to form 

 a rounded ridge, terminated by a small tooth; a second but 

 stronger one is observed on the inner side of the preceding 

 joint; fingers striate, and almost equally dentated, with a black- 

 ish tip. 



A fossil species is found in the marly limestone of Monte- 

 Bolca, which, according to Desmarest, Hist. Nat. des Crust. 

 Foss., p. 125, is closely related to the mosnas. 



In the Portunus Rondelelii, Risso, there are no teeth in front. 

 The one he calls longipes, presents the same character, but its 

 feet are longer in proportion than those of other analogous spe- 

 cies. 

 We will form a fourth division with the subgenus. 



Platyonichus, Lat. 

 Which name has replaced that of Portumnus, Leach, on account 



tacts du departement du Calvados," by ]?rebisson,'and especially the excellent work 

 of Dr Leach, Malacostraca Podophthalmia Britanniw. M. Desmarest has well de- 

 veloped the system of this author in his Considerations Generates sur les Crustacfs, 

 an extremely useful book to those who make this branch of Zoology their study. 

 See also our article Portune, Encyc. Methodique. 

 Vol. Ill D 



