XANTHO. 
CANCER, Montagu. 
XANTHO, Leach. 
Antenna externa brevissimaj, in oculorum cantho interno insex tae . 
interna sub clypei prominentis margine antico foveolis receptee ; pedunculo sublineari. 
Pedipalpi gemini externi caulis interni articulo secundo ad apicem internum emarginato. 
Pedum par anticum inaequale didactylum : paria 2, 3, 4 et 5 ambulatoria. 
Abdomen mahis 5, Femin^e 7-articulatum. 
Testa transversa, margine antico in lineam semiellipticam arcuato, postice submaiginata: oibita 
supra integra inferne externe fissura unica. 
Oculi pedunculo brevi. 
External antennae very short, inserted in the internal canthus of the eye : internal antennae 
received into foveolae in the anterior prominent margin of the clypeus ; the peduncle sublinear. 
External double pedipalpeswith the second joint of the internal footstalk, notched at its internal 
apex. Anterior pair of legs unequal didactyle ; other pairs formed for walking. Abdomen 
of the male five, of the female seven-jointed. Shell transverse ; the anterior margin semi-elliptically 
bent, hinder part slightly margined ; orbit entire above, externally beneath with one fissure. 
Eyes with a short peduncle. 
