CARCINUS. 
CANCER, Auctorum, 
CARCINUS, Leach. 
Antenne externe setacex articulis duobus primis majoribus, in oculorum cantho interno inserte 
Pedipalpi externi apice interiore truncato-emarginati. 
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Pedum par anticum inequale, didactylum, manibus externé glabris: paria 2, 3 et 4 subcom- 
pressa, unguibus quadratis longitudinaliter sulcatis: par quintum compressum, subnatato- 
rium, ungue compresso. 
Abdomen Manis 5-articulatum, articulo quarto transverso precedente vix angustiore: Fammn 
7-articulatum. 
Testa diametno taankerse aaa utrinque 5-dentata, margine antico semicirculari, orbita 
posticé et inferné unifissa, cantho interno imperfecto. 
Oculi pedunculo angustiores. 
External antennz setaceous, with the two first joints longest, inserted in the internal angle 
of the orbit. External pedipalpes with their internal apex truncate-emarginate. Anterior 
pair of legs unequal didactyle, their hands externally smooth ; second, third, and fourth pairs 
slightly compressed, with quadrate claws longitudinally sulcated: fifth pair compressed, with 
compressed claws. Abdomen of the male five-jointed, the fourth joint transverse, scarcely 
narrower than the preceding joint; of the female seven-jointed. Shell rather broader than 
long, with five dentations on each side, the front margin semicircular: orbit behind and 
beneath with one fissure, the internal canthus imperfect. Eyes narrower than their peduncles. 
One species only of this Genus is known. 
