
MR. T. BELL ON THE GENUS CANCER. 337 
specimens. The orbits have a rather strong tooth over the inner canthus ; there are 
two parallel fissures above, and one beneath. The latero-anterior margin on each side 
extends as far backwards as the centre of the cardiac region, where it is lost in a 
sinuous granulated ridge which rises over the latero-posterior margin. It is divided 
into ten lobes, which are either quadrate, and therefore contiguous at the sides, as in 
most of the species ; or lanceolate, as in Canc. dentatus: the last lobe is always very 
small, and often obsolete. 
The external antenne have the basilar joint broad, very long and thick, filling the 
hiatus between the inner canthus of the orbit and the front, and terminating forwards 
in a strong, angular, tooth-like projection, directed forwards and a little inwards, 
reaching beyond the frontal line. The terminal or moveable portion is slender, very 
short, and arises from the internal part of the basilar joint, nearer to the cell of the in- 
ternal antenne than to the orbit. The internal antenna, instead of lying obliquely out- 
wards or transversely, as in most other genera of this section, are directed forwards ; a 
character by which Cancer may at once be distinguished from Platypodia, Carpilius, 
Xantho, &c. The second joint of the inner footstalk of the external pedipalps is ex- 
cavated at the anterior part of the inner margin ; in some species the notch is confined 
to the angle, in others it extends half way down the side of the joint. The first pair of 
feet is nearly equal; in some specimens of each species the difference in size being 
scarcely appreciable. They are generally very robust. The remaining feet have no 
spines, but are in most species more or less hairy. The abdomen of the male has five, 
that of the female seven, joints. 
With the exception of our indigenous species, Canc. Pagurus, they are all, as far as 
their localities are yet known, exclusively natives of the coasts of the hotter parts of 
America. 
1. CANCER LONGIPES. 
Tab. XLIII. 
Canc. test leviter granulatd, sparsim punctatd ; margine antico-laterali plicato, decem- 
lobato, lobis contiguis, ad marginem minute denticulatis ; manibus levibus, extus lineis 
quinque impresso-punctatis; pedibus longioribus ; abdominis articulo ultimo equilate- 
raliter triangulart. 
Hab. apud Valparaiso. (Cuming.) 
3 Muss. Soc. Zool., Bell. 
The general colour and thin texture of the carapax, with the long slender form of 
the legs, remove this species at first sight far from those which a nearer inspection 
prove to be very nearly allied to it; particularly Canc. Edwards, to which many of its 
most important characters so closely approximate it, as to require some care in ex- 
pressing its specific diagnostic phrase. 
