XANTHTO. 
CANCER, Montagu. 
XANTHO, Leach. 
Antenne externe brevissime, in oculorum cantho interno inserte : 
interne sub clypei prominentis margine antico foveolis recepte ; pedunculo sublineari. 
Pedipalpi gemini externi caulis interni articulo secundo ad apicem internum emarginato. 
Pedum par anticum inequale didactylum : paria 2, 3, 4 et 5ambulatoria. 
Abdomen manis 5, Femina 7-articulatum. 
Testa transversa, margine antico in lineam semiellipticam arcuato, posticé submarginata: orbita 
supra integra inferné externé fissura unica. 
Oculi pedunculo brevi. 
External antenne very short, inserted in the internal canthus of the eye: internal antenna 
received into foveole in the anterior prominent margin of the clypeus ; the peduncle sublinear. 
External double pedipalpes with 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. 
