6 
brilliantly polished. The general outline bears some little resem- 
blance to that of the true ¢runculus of Linnzeus, a very different shell 
from that erroneously but universally so designated by those who 
have written on British conchology. 
Donax pventiFERA. Don. testd abbreviato-subtriangulari, posticeé 
rotundatd, antice obtusd et tumidd, rugis tenuissimis strias longi- 
tudinales anticé decussantibus ; vulud subbiangulatd, striis tenuibus 
subgranulatis radiatd, sulcoque dentifero notatd ; margine ventrali 
vie arcuato ; dentibus cardinalibus et lateralibus in utrdque valvuld 
duobus ; intis marginibus crenatis. 
Long. 14 poll. ; lat. 12 poll. 
Hab. 5 
The abbreviated shape of this remarkable shell would alone sepa- 
rate it from most of the Donaces possessing a crenulated margin. 
The extraordinary tooth at the extremity of the radiating groove in 
one valve, which fits into a corresponding notch at the extremity of 
that of the other, is however its more prominent characteristic. A 
few teeth show themselves likewise at the extremity of the longitu- 
dinal elevated strie which margin the anterior slope. 
The colouring is extremely variable, being uniform flesh-colour, 
olive-yellow, with the umbones violet, or even white. ‘The interior 
rivals the exterior in the diversity of its tints. 
Donax puLcHELLA. Don. testd transversim elongatd, convexd, pel- 
lucidd, politd, postice attenuata, productd, antice brevi ; obtusd, 
margine ligamentali valde convead ; albidd, striis longitudinalibus 
obsoletis anticeque radiis purpureis angustis tribus ornatd ; vulvd 
lateribus rotundatd, striisque tenuibus radiatd ; margine ventrali 
subrectd, intis crenulatd ; dentibus lateralibus valde approximatis. 
Long. } poll. ; lat. 3 poll. 
Hab. West Indies. 
An exceedingly common species from the West Indies, which, 
from its apparent similarity with the scalpellum of Gray, has hitherto 
remained uncharacterized. Its peculiarly transverse shape, its 
breadth being considerably more than twice its length, sufficiently 
distinguishes it from any of the named species of this genus, with the 
exception of the Oweniti and scalpellum, from which it is separated 
by its greater convexity and its distinctive colouring. 
Mr. Hanley also describes a new species of Mya of Linneus and 
Lamarck :— 
Mya semistriAta. Mya testd ovato-oblongd, subequilaterali, ventri- 
cosd, postice rotundatd, antice subtruncatd et attenuatd, candida, 
tenui, pellucidd, longitudinaliter striatd ; striis tenuibus, confertis, 
antice elevatis ; ared posticd striarum eaperte, transversim rugosd ; 
dente cardinali obliquo. 
Long. 2 poll.; lat. 1 poll. 
Hab. ? Mus. Metcalfe. 
A single valve, in the cabinet of W. Metcalfe, Esq., is the sole 
specimen of this elegant and distinct shell I have ever beheld, and 
