DECAPODA. 167 



the ocular cavities. The fossulae 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 generically 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 

 canthus of the ocular fossulfe ; 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 

 form 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 

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

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

 ralliims, F. ; C. mauculatus. Id., are marked with round blood- 

 coloured 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. Jloridu^, Leach, 

 Malac. Brit., XI; — Cancer poressa, Oliv., Zool. Adriat., II, 3, in- 

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

 canthus of the ocular fossulae, 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 ones. 



The " Crabe vidgaire de nos cotes'*' of the first edition of this work, 

 has in this one been placed among the Portuni. — P. moenas. 



PiRiMELA, Leach. 



These Crustacea completely resemble Crabs, but their external 

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

 than their pedicle, consist of numerous joints. The fossuke of the 

 intermediaries, as in the C. pagurus, ^.Ye rather longitudinal than 

 transversal. 



But a single species is known, the P. denticiUala, Leach, 

 Mahc. Brit., VIII; it is found in the British channel and in the 

 Mediterranean. Perhaps we should refer to this species, the 

 fossil described by Desmarcst imder the name of Atelectjde ru- 

 gueux, in the Hist. Nat. de Crust. Foss., IX, 9. 



