Zoological Society, 57 



inmquilaterali, nitidd, ehurned, ventricosd, concentrice et suhimhri- 

 catim sulcatd ; sulcis hand confertis ; margine venti'di arcuato ; 

 dorsali utrinque declivi, antice retuso, postice arcuato; utrdque 

 extremitate rotundatd ; lunuld hand magnd, impressd ; ared dorsali 

 jwsticd nulld. Long. r63 ; 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- 

 tellsc) are elevated, the hinder dorsal area is excavated, and the lunula 

 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. testd suborbiculari, subquadratd, 

 compressd, subpellucidd, valde incequilaterali, intus extusque albidd, 

 concentrice substriatd; margine ventrali postice arcuato, antice 

 convexo et sursilm acclivi ; dorsali antice convexo haudque declivi, 

 jjostice subrecto et declivi ; extremitate posticd latissimd, anticd 

 angustd; lunuld magnd, subobsoletd. Long. 1*62 ; lat. r75 poll, 

 Ind. Test., sup. t. 15. 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 diflferent from any 

 known species in this genus. 



Artemis sculpta. Art. testd orbicularis subquadratd, magis mi- 

 nusve ventricosd, solidiusculd, incequilaterali, subnitidd, sordide 

 albidd aut albido- lutes cent e (nonnunquam pallide livido-fuscescente 

 alboque marmoratd), concentrice sulcatd ; striis radiantibus, sulcos 

 con/ertissimos antice (plerumque etiam postice) decussantibus ; 

 sulcis medio subimbricatis, ad utramque extremitatem lamellosis ; 

 margine ventrali subarcuato ; dorsali postice convexiusculo vixque 

 declivi, antice retuso et paulb declivi; lunula 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 



