UKCAPODA. 167 



the ocular cavities. The fossuhc of the middle or internal antennae 

 are nearly longitudinal. Such is the 



C. pagurus, L. ; Crabe poupart, &c. ; Herbst., IX, 59. Shell 

 reddish, wide, plane, almost smooth above, with nine festoons in 

 each lateral margin, and three teeth in front. Its claws are 

 large, smooth, with black fingers studded internally with blunt 

 tubercles. It is sometimes a foot wide, and weighs five pounds. 

 Common on the Atlantic coast of France, but less abundant in 

 the Mediterranean. Its flesh is esteemed. Dr. Leach separates 

 it gencrically from the other Crabs : Malac. Brit., XVII, x. 



In the others, the lower joints of the Antennae are cylindrical; al- 

 though somewhat larger, the first does not differ from the following 

 ones in form or proportion, and does not extend beyond the internal 

 j-an t h us of the ocular fossulae ; those of the intermediate antennae are 

 prolonged in a direction rather parallel to the breadth of the shell 

 than to its length. 



There are some of them C. ll-dentatus. Fab., in which the ex- 

 tremity of the fingers are excavated like the bowl of a spoon: they 

 to rm the Clorodius^ Leach. Several species, where they terminate 

 in a point, are remarkable for the arcuation of the edges of the shell 

 which terminate posteriorly by a fold and overlapping projection, 

 in the manner of an angle. Those with a tridentated front, and 

 whose shell only presents that projection or posterior tooth, com- 

 pose his genus Carpilius. The species of this subdivision, C. co- 

 rtillinu^ F. ; C. mauciUatus, Id., are marked with round blood- 

 v oloured spots. They more particularly inhabit the Indian Ocean. 

 Many fossil Crabs appear to me to belong to this subdivision. 



The Xantho, of the same, some of which, Xanth. floridus. Leach, 

 Malac. Brit., XI; Cancer pores s a, Oliv., Zool. Adriat., II, 3, in- 

 habit the coast of France, have their antennae inserted in the internal 

 canthus of the ocular fossilise, and not in the outer one, as in those 

 just mentioned. 



Other considerations would authorise us to augment the number 

 of these divisions, but our limits require us merely to indicate the 

 principal HUM. 



The * Crabe vulyaire de nos cdtes" of the first edition of this work, 

 has in this one been placed among the Portuni. P. mcenas. 



PIRIMELA, Leach. 



These Crustacea completely resemble Crabs, but their external 

 antennae extend considerably beyond the front, and their stem, longer 



than th-ir pedicle, consist of numerous joints. The fossulae of the 

 intermediaries, as in the C.paguru^&Tc rather longitudinal than 

 transversal. 



But a single spci -i. > is known, the P. denticulata, Loach, 



Malac. Brit., VI 11 : it is found in the British channel and in the 

 M- diterramMii. Perhaps \ve should refer to this species, th.- 

 i described by Dcsinarest under the name O f Atelecycle ru- 

 r iii the Hist. Nat.de r nis t. Fi*s.. IX, 9. 



