320 
Dr. Leach's Arrangement of the Crustacea, 
plicia. Testa transversa, margine antico in lineam semiellipticam 
arcuato. 
Gen. 10. Ca NCER auctorum. 
Antennce externa breves, inter oculorum canthum internum et 
frontem insertse ; interna clypei medio in foveolis receptee, pe- 
dunculo sublunari. Talpi gemini externi caulis interni articulo 
secundo ad apicem internum emarginato. Testa postice mar- 
ginata: orhita postice fissara unic^ externe uniplicata, sub- 
tus fissur^ unic4 et externe uniplicat^i. Pedum par anticum 
ineequale. 
Spec. 1. Cancer Pagurus. 
C. testd granulate utrinque novernplicat^, fronte trilobo. 
Cancer pagurus auctorum. 
Gen. 11. Xantho. 
Cancer, Montagu, (flerhst ?) 
Antenna externa brevissimee, in oculorum cantho interno insertee ; 
interna sub clypei proininentis margine antico foveolis receptee, 
pedunculo sublineari. Pedipalpi gemini externi caulis interni 
articulo secundo ad apicem internum emarginato. Testa pos- 
tice submarginata. Orbita supra integra inferne externe fis- 
sure unicd. Pedum par anticum inaequale. 
Spec. 1. Xantho forida. 
X. carpis supra bituberciilatis, test4 utrinque dentibus quatuor 
obtusis : interstitiis excisis, digitis nigris. 
Cancer floridus. Montagu, Trans. Lin?i. Soc. ix. p. 85. i. 2,fg. 1. 
Var. (B. Digitis concoloribus. 
Habitat in Danmoniae Australis littora passim. 
Mr. Montagu has considered this species to be the Cancer flo- 
ridus of Linne; but an examination of the characters in the 
Amanitates 
