PIRIMELA. 
CANCER. Montagu. 
Antenne externe elongate, setacee ad oculorum canthum internum inserte : 
interne in foveolis obliquis reponende. 
Pedipalpi gemini externi cauli interno articulo secundo quadrato, ad apicem internum truncato- 
subemarginato palpigero. 
Pedum par anticum equale, didactylum ; paria alia ambulatoria, subcompressa : wngwes acuti. 
Abdomen Maris 5, Famine 7-articulatum. 
Testa subtransversa, margine antico in lineam subsemicircularem arcuato ; orbita supra ac 
infra fissuraé unica. 
Oculi pedunculo subcrassiores. 
Obs. Mas abdomine articulo quarto quadrato. 
—— 
External antenne elongate, setaceous, inserted at the internal corner of the eyes ; internal 
antenne placed in oblique excavations. External double pedipalpes with the second joint of 
their internal footstalks, having the internal apex truncate-emarginate for the insertion of the 
palpes. Anterior pair of legs unequal, didactyle; the other pairs formed for walking, sub- 
compressed ; claws sharp. Abdomen of the Mare with five, of the Femare with sev enjoints. 
Shell somewhat transverse, the anterior margin bent in a semicircular line ; orbit above and below 
with one fissure. Eyes somewhat thicker than their peduncles. 
This Genus is distinguished from Carcinus, to which it makes the nearest approach, by 
having the four hinder pair of legs equally compressed, by the greater length of its antenne, and 
by the form of the fourth segment of the abdomen of the male. 
