DECAPODA. 167 
the ocular cavities. The fossulae of the middle or internal antennse 
are nearly longitudinal. Such is the 
C. pagurus,\^.-, Crabe poupart, Sic.; 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 F ranee, 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 Antennse 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 fossulse ; those of the intermediate antennse are 
prolonged in a direction rather parallel to the breadth of the shell 
than to its length. 
There are some of them — C. 11-deniatus, 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 
whose shell only presents that projection or posterior tooth, com- 
pose his genus Carpilius. The species of this subdivision, — C. co- 
rallinus, 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. floridus, 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 vidtjaire de nos cutes” 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 fossulae of tlie 
intermediaries, as in the C. pagurus, are rather longitudinal than 
transversal. 
But a single species is known, the P. denticulata, Leach, 
Malac. Brit., VIII ; it is found in the British channel and in the 
M(“ditcrranean. Perhaps we should refer to this species, the 
fossil described by Desmarest under the name of Atelecijcle rit- 
gneux, in the Hist. Nat. de Crust. Foss., IX, 9. 
