224 
parvis, viv centralibus, lunula oblongo-cordata ; concentrice striata, 
striis medio confertis, elevatiusculis, nonnullis utrinque obsoletis, 
alteris postice erectis, lamellatis, productis ; area lanceolata an- 
gusta, marginibus regulariter lamellosis ; margine dorsali declivo ; 
margine neulrali producto, rotundato ; intus alba. 
Hab. Malacca (Dr. Traill). Mus. Cuming. 
The strie are alternately obliterated towards the sides, which pro- 
duces a crowned appearance in the middle of the valves. Like 
D. Gruneri, Phil., it is strongly plicate at the lozenge. 
13. Dosinta cypippr, A. Adams. JD. testa solidiuscula, sub- 
ventricosa, albida, ad umbones luteola, rotundato-cordata, con- 
centrice striata, striis confertis, vix elevatis ; longitudinaliter ra- 
diatim crebre striata, lunula oblongo-cordata, umbonibus levibus, 
area lanceolata angusta ; intus alba; sinu pallii impressionis ob- 
liquo, profundo, apice obtuso. 
Hab. Van Diemen’s Land (Mr. Gunn). Mus. Cuming. 
This is a neat-looking species, without any great distinguishing 
peculiarity, except that, under the lens, the concentric, elevated strize 
are finely engraved with radiating lines. 
14. Dostnra stmpLex, A. Adams. D. testa solida, compressius- 
cula, subquadrato-cordata, alba, inequilaterali, concentrice striata, 
striis confertis, incrassatis, inequalibus, lunula oblongo-cordata, 
umbonibus levibus, anteversis, area lanceolata angusta, margine 
dorsali vix arcuato, latere postico subtruncato, subsinuato ; sinu 
pallii impressionis lato, apice obtuso ; intus alba. 
Hab. Singapore. Mus. Cuming. 
In this species the elevated concentric striz are irregular, some 
being more elevated than the others; the posterior side of the shell 
is somewhat sinuated, and the sinus of the pallial line is very wide 
with an obtuse apex. 
15. Dosin1ta pitecta, A. Adams. OD. testa tenui, subventricosa, 
orbiculato-cordata, alba, lamellis concentricis, distantibus, tenui- 
bus, postice productis erectis, ornata; interstitiis nitidis, trans- 
versim striatis ; lunula cordata, medio elevata; area lanceolata 
angusta, marginihus lamellosis ; margine dorsali regulariter ar- 
cuato; intus alba. 
Hab. Malacca (Dr. Traill). Mus. Cuming. 
A very elegant species, of a delicate structure, with the lamelle 
‘thin and wide apart; the interstices shining and concentrically 
striated ; and with the lozenge margined with elevated lamine. 
16. Dostnta grunice, A, Adams. JD. testa solida, compressius- 
cula, orbiculato-cordata, alba, nitida, radiatim obsolete sulcata, 
concentrice striata, striis confertis, elevatis, equalibus, utrinque 
erectis, sublamellaceis ; lunula triangulari, valide impressa, lamina 
cardinali producta, acuta, area lanceolata marginibus angulatis ; 
intus alba ; sinu pallit impressionis obliquo, profundo, angulato. 
Hab. ? Mus. Cuming. 
