320 
obtuso, superne valde declivi et convexiusculo ; valvis inequaliter 
extus striatis, striis ad latus posticum interruptis. 
Hab. East coast of Australia. Coll. Cuming. 
13. PsammMosia aneusta, Desh. P. testa elongato-transversa, 
angusta, longe ellipsoidea, equilaterali, tenui, fragili, convexius- 
cula, transversim obsolete et inequaliter striata, candida, aliquando 
posterius flavescente, intus pallide violascente vel alba, extremi- 
tatibus equaliter obtusis, margine superiore inferiori parallelo ; 
cardine angustissimo, bidentato, altero unidentato, dentibus apice 
bifidis ; sinu pallii elongato, apice angusto, attenuato, superne 
declivi, basi dilatato. 
Hab. Senegal. Coll. Cuming. 
14. PsammMopia PuELLA, Desh. P. testa elongato-transversa, 
tenui, depressa, inequilaterali, nitida, tenui regulariter trans- 
versim striata, striis depressis, in latere postico latioribus, ruge- 
formibus, alba, ad umbones nitide violacea, roseo eleganter radiata, 
intus pallide violascente ; latere antico longiore, obtuso, superne 
convexiusculo, rotundato ; latere postico angustiore, convexiusculo, 
obtuse subangulato ; linea impressa pallii antice margine valde 
remota, sinu profundo, ad extremitatem superne declivi, attenuato. 
Hab. Australia. Coll. Cuming. 
15. PsammMosia ANOMALA, Desh. P. testa elongato-transversa, 
tenui, fragili, tumidula, subequilaterali, nitida, aliquantisper 
hyalina, roseo-purpurascente vel violascente obsolete radiata, 
transversim oblique minute striata, striis ad latus posticum 
evanidis; latere antico paulo attenuato, obtuso, postico paulo 
latiore, truncato, angulo oblique decurrente distincto ; valvis intus 
pallide roseo-violaceis ; cardine angusto, bidentato, altero uni- 
dentato, dentibus lateralibus subequalibus, prominulis, elongatis, 
angustis ; sinu pallit lato, profundo, late obtuso, 
Hab. Philippine Islands, Zebu. Coll. Cuming. 
16. PsammMosia TENUIS, Desh. P. testa elongato-transversa, 
convexiuscula, tenui, hyalina, fragili, inequilaterali, pallide rosea, 
oblique tenuissime et regulariter striata, striis ad latus posticum 
abrupte terminatis ; latere antico longiore, paulo attenuato, superne 
vix convexo ; latere postico latiore, late truncato, superne recto ; 
nymphis brevibus, angustis, via prominentibus ; cardine angustis- 
simo, inequaliter bidentato, dentibus minimis, majoribus bifidis ; 
sinu pallii latissimo, profundo, late obtuso. 
Var. (3. Testa paulo solidiore, rosea, eleganter pallide purpurascente 
radiata. 
Hab. Philippine Islands. Var. Chinese Seas. Coll. Cuming. 
17. PsammosiA PETALINA, Desh. P. testa minima, compressa, 
tenui, pellucida, fragili, inequilaterali, nitida, obsolete transversim 
striata, pallide albo-violascente, violaceo quinqueradiata, radiis 
