101 
tratd, antic? ab umbonibus exaratd, postic? obtuse carinatd ; lunuld 
ovali. Long. 3; lat. 14; alt. 2 lin. 
Hab. Gulf of Nicoya; from thirty-six fathoms. 
Cab. Belcher et Cuming. 
Mr. Lovell Reeve communicated a paper from Mr. Sylvanus Han- 
ley, containing the following ‘‘ Descriptions of five new species of 
bivalve Shells, from the collection of W. Metcalfe, Esq.” 
Genus SoLen. 
Soren Puruiprrnarum. Sol. testd lineari, converd, crassa, subar- 
cuatd, albido-lutescente ; latitudine longitudinem quintuplo supe- 
rante ; margine postic? rotundato, antic? convexo ; natibus ad quin- 
tam partem totius latitudinis collocatis ; epidermide ampld, rugosd, 
impolitd, olivaceo-flavescente ; dente valido, acuto, in utrdque valvd 
prominente. Lat. 1; long. 5 poll. 
Hab. ad Insulas Philippinarum. 
A species nearly allied to the S. ambiguus of Lamarck, from which 
however it differs, both in its greater curvature and in the absence 
of the discal rays which adorn that species. Its breadth is through- 
out equal, and the umbones are considerably flattened. 
Soten acinaces. Sol. testd lineari, nived, subdepressd, arcuatd, 
postice abruptd, antice attenuata, rotundatd ; latitudine longitudinem 
prope quadrupld superante ; margine postico vie convexo ; epider- 
mide nitidd flavescente ; cardine terminali, dente in utrdque valvd, 
unico, rotundato. Long. 2; lat. 3 poll. 
Hab. f 
A shell scarcely to be confounded with any of this genus, but with 
somewhat the aspect of S. scalprum. 
Soren cyztinpraceus. Sol. testd lineari, rectd, cylindraced, sub 
epidermide fugaci, albd, rubido-purpurascente variegatd ; latitu- 
dine longitudinem sextuplo superante ; margine antice rotundato- 
obtuso, postice abrupto, concavo; cardine terminali, dente sub- 
lunari in utrdque valvd prominente. Long. 4 ; lat. 3 poll. 
Hab. ? 
A tolerably strong shell, intermediate between the S. linearis of 
Wood and the S. brevis of my descriptive Catalogue. The former 
species is considerably narrower from the umbones to the ventral 
margin, these proportions being precisely reversed in the latter. 
The colouring likewise, which in the adult is almost entirely confined 
to the posterior half, differs from its arrangement in the S. brevis. 
MesopEsMA TRIQUETRUM. Mes. testd oblique triangulari, valdé 
inequilaterali, crassissimd, tumidd, leviusculd, sordidé albidd ; pos- 
tice brevi, rotundatd, antice productd, subacuminatd, subrostratd ; 
margine antico declivi, ventrali arcuato ; pube depressd ; foved liga- 
mentali inter nates distantes plane hiante; dentibus lateralibus 
magnis, validis. Long. 7; lat. 1 poll. 
Hab. ? 
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