317 
imperforata, nigra, glabra, longitudinaliter oblique striata, ad 
suturas crenulata, anfractibus convexiusculis, ultimo rotundato, 
basi planiusculo, regione umbilicali valde impressa, callo albo 
obtecta ; columella superne sinuata, antice bituberculata, tuber- 
culo supremo prominente ; labro nigro marginato. 
Hab. California. (Mus. Cuming.) 
This species is somewhat like C. mcestum, Jonas, but the spiral 
callus surrounding the umbilicus is not prominent as in that species. 
26. Puiuippra Layarpi, A. Adams. P. testa depresso-conica, 
late umbilicata, fulva, albido maculata, anfractibus planius- 
culis, levigatis, ad suturas cingulis duabus instructis, anfractu 
ultimo ad peripheriam angulato, cingulis tribus ornato, basi 
planiusculo, cingulis granorum (circa regione umbilicali) in- 
structo, margine umbilici crenulato. 
Hab. Ceylon, Mr. Layard. (Mus. Cuming.) 
A brownish-yellow species, with the margin keeled, and with the 
surface of the valves smooth. 
27. PuruipprA oxyTropis, A. Adams. P. testa conico-depressa, 
discoidea, late umbilicata, albida, luteo fuscoque variegatim 
picta, nucleo magno, albido, vitreo, anfractibus planiusculis, 
transversim lineatis, ad suturas cingulis duobus elevatis in- 
structis ; ad peripheriam acute angulata, cingulis duobus cincta, 
basi convexiuscula ; margine umbilici crenato, corrugato. 
Hab. New Caledonia. (Mus. Cuming.) 
A pretty variegated species, with a large smooth glassy nucleus, 
and with the periphery acutely keeled. 
8. Descriptions or New SHELLS FROM THE COLLECTION OF 
Huex Cumine, Ese. By M. G. P. DesHayss. 
1. PsammosiA MAxIMA, Desh. P. testa magna, ovato-transversa, 
compressiuscula, solida, valde inequilaterali, utroque latere hiante, 
transversim inequaliter et obsolete striata, postice subundulata, ad 
margines epidermide fusca vestita, albo-lutescente, roseo radiata, 
intus alba, vel flavido tincta ; latere antico brevi, late rotundato, 
tantummodo attenuato; latere postico oblique rotundato, suban- 
gulato ; umbonibus depressis, latis, obliquis, vix prominentibus ; 
cardine dextro unidentato, dente compresso acuminato, sinistro 
sub-bidentato, dentibus angustissimis, parum prominentibus ; 
nymphis maximis, prominentibus, latis ; sinu pallii magno, pro- 
fundo, latissimo. 
Hab. ? Coll. Cuming. 
2. Psammosia Nivosa, Desh. P. testa ovato-transversa, solidula, 
compressiuscula, utroque latere hiante, inequilaterali, transversim 
