98 Mr. J. C. MelviU on the 



confusion. It has been placed by Mr. Edgar Smith in the 

 National Collection as Standella Ji/ra, Melv., in direct 

 sequence with >S'. Solandri, Gray. 



Lucina {Codakia) angela^ sp. n. 

 (PI. II. fig. 8.) 



L. testa parva, orbiculari, albo-calcarea, fere sequilaterali ; umboni- 

 bus contiguis, prominulis, margine dorsali antice pauUum oxca- 

 vato, delude leniter rotnudato per margiuem ventralcm usque ad 

 latus posticum ; superficie externa longitudinaliter teuuicostata ; 

 costis ad quinquaginta, delicate imbricatuiis, oblique arcuatis, 

 concentrice irregTilariter plicata ; costis trans medium versus latus 

 anticum pulchre divaricatis, ligamento vix externo ; pagina interna 

 subpellucentc, albida, nitida ; margine uudique pulchre crenulato ; 

 dentibus in utraque valva cardinalibus, simul ac lateralibus, 

 duobus ; impressione palliali couspicua, baud sinuosa. 



Alt. 8, lat. 9, diam. 4 mm. 



Hah. Gwadur, on hard sandy mud, dredged at 8 fathoms. 



Allied to L. jihula^ Ad. & Rve., and pecten, Lam., this 

 little species differs from both in form and the character of the 

 divaricating ribs. The form is more trnly orbicular and 

 almost equilateral. The umbones are prominent, contiguous, 

 and inclined anteriorly, on which side the dorsal margin is 

 slightly excavate, but soon rounds oflf towards the ventral 

 margin and forms an almost complete circle. The divari- 

 cating ribs are slightly beyond the centre of the surface and 

 towards the anterior side ; the total number of ribs is about 

 fifty, they are close and finely imbricate ; the shell is rudely 

 and irregularly, here and there concentrically, plaited. 

 "Within, the surface is white, shining, subpellucid, the whole 

 rounded margin is finely crenulatc ; each valve possesses two 

 lateral and two cardinal teeth, and the pallial impression is 

 entire and conspicuous. The ligament appears in part con- 

 cealed by the valve-margin. 



Several examples. 



Cryptodon victoriah's, sp. n. (PI. II. figs. 9, 9 a.) 



0. testa delicata, albo-lactca, OTato-orbiculari, a^quivalvi, paullum 

 ina;quilaterali, undique concentrice pulcherrime lamellata ; lamcllis 

 teueris, arctis, apud umbones sa;pe evanidis, iu numero circa 

 sexaginta ; urabonibus contiguis, antice inversis, latere postico 

 longitudinaliter obliijuiplicato, antice lunula distincta ad marginem 

 serrata, excavata ; superticie sub lentc hie illic pellucide punctata ; 

 dcntc cardinali valva) dextra>magno, couspicuo; pagina inlu^ lactca, 

 vix nitcute, punctis pellucidis nitidis et striis longitudinalibus 

 notata ; linca palliali completa. 



Alt. 24, lat. 24, diam. 14 (sp. maj.). 



