Zoological Society. 57 
inequilaterali, nitida, eburned, ventricosd, concentrice et subimbri. 
catim sulcatd; sulcis haud confertis ; margine ventrali arcuato ; 
dorsali utringue declivi, antice retuso, postice arcuato; utrdaque 
extremitate rotundatd ; lunuld haud magni, impressd ; ared dorsale 
posticd nulld. Long. 1°63; lat. 1°55 poll. 
Index Testaceologicus, sup. t. 15. f. 41. 
Hab. Panama, St. Elena. Mus. Cuming, Hanley. 
The general outline, owing to the abruptness of its slopes, closely 
resembles that of excisa; but in that species the sulci (or rather cos- 
tell ) are elevated, the hinder dorsal area is excavated, and the lunule 
is large and ill-defined. The colour is ivory-white, with usually a 
zone or two of very pale blue; and, contrary to the other two spe- 
cies, the greatest length is from the beaks to the lower or ventral 
margin. 
ARTEMIS sUBQUADRATA. Art. ftestd suborbiculari, subquadratd, 
compressa, subpellucidd, valde inequilaterali, intus extusque albidd, 
concentrice substriatd ; margine ventrali postice arcuato, antice 
convexo et sursim acclivi ; dorsali antice convexo haudque declivi, 
postice subrecto et declivi; extremitate postica latissimd, anticd 
angustd ; lunuld magnd, subobsoletd. Long. 1°62; lat. 1°75 poll. 
Yn. ‘Fest.; sup: t. Yo: f 39: 
Hab. St. Elena, West Columbia. Mus. Cuming, Hanley. 
The peculiar breadth of the posterior side, whose upper or dorsal 
angle is horizontal, or even ascending, the freedom from incurvation 
and abrupt slope of the front dorsal line, and the scarcely defined 
lunule, concur to render this rare shell strikingly different from any 
known species in this genus. 
ArreMis scuupTa. Art. testd orbiculari-subquadratd, magis mi- 
nusve ventricosd, solidiusculd, inequilaterali, subnitidd,, sordideé 
albidd aut albido-lutescente (nonnunquam pallide livido-fuscescente 
alboque marmoratd), concentricé sulcatd ; striis radiantibus, sulcos 
confertissimos antice (plerumque etiam postice) decussantibus ; 
sulcis medio subimbricatis, ad utramque extremitatem lamellosis ; 
margine ventrali subarcuato ; dorsali postice conveaxiusculo viaque 
declivi, anticé retuso et paulo declivi; lunuld impressd, ovato- 
cordatd; ared dorsali posticd nulld ; natibus haud prominentibus. 
Long. 1°80; lat. 2 poll. 
Ind, Test., sup. t. 15. f. 42. 
Hab. Australia? Mus. Hanley, &c. 
The radiating lines are not always perceptible on the posterior 
side of the adult, and the concentric sulci in that case appear fim- 
briated. It is allied to subrosea of Gray. 
February 11.—William Yarrell, Esq., in the Chair. 
A specimen of Cancer norvegicus, taken by a fishing-boat at the 
«Silver Pits,” eighty miles eastward of Scarborough, was presented 
by Mr. Ingarfield. 
A communication was read from James Stark, M.D., F.R.S.E., 
in which he advocates the hypothesis that the Tetrao medius is neither 
