320 Dr. LrzAcnu's Arrangement of the Crustacea, &c. 
plicia. Testa transversa, margine antico in lineam semiellipticam 
arcuato. 
Gen. 10. CANCER auctorum. 
Antenne externe breves, inter oculorum canthum internum et 
frontem insertz ; interne clypei medio in foveolis recepte, pe- 
dunculo sublunari. Palpi gemini externi caulis interni articulo 
secundo ad apicem internum emarginato. Testa postice mar- 
ginata: orbita postice fissurà unica externe uniplicatä, sub- 
tus fissurà unicá et externe uniplicatà. Pedum par anticum 
inzequale. 
Spec. 1. Cancer Pagurus. 
C. testá granulatä utrinque novemplicata, fronte trilobo. 
Cancer pagurus auctorum. 
Ges: 11. XANTHO. 
Cancer, Montagu, (Herbst ?) 
Antenne externe brevissim®, in oculorum cantho interno insertze ; 
interne sub clypei prominentis margine antico foveolis receptz, 
pedunculo sublineari. Pedipalpi gemini externi caulis interni 
articulo secundo ad apicem internum emarginato. Testa pos- 
tice submarginata. Orbita. supra integra inferne externe fis- 
surá unicá. Pedum par. anticum inzquale. 
Spec. 1. Xantho florida. 
X. éarpis supra bituberculatis, testa utrinque dentibus quatuor 
obtusis : interstitiis excisis, digitis nigris. 
Cancer floridus. Montagu, Trans. Linn. Soc. ix. p. 85. t. 2. Jg. 1, 
"Var. B. Digitis concoloribus, 
Habitat in Danmoniz Australis littora passim. 
Mr. Montagu has considered this species to be the Cancer flo- 
ridus of Linné; but an examination of the characters in the 
Amenitates 
