Report on the zoological collections made in the Indo-Pacific Ocean ...

MOLLXTSCA. 105guishing character in species of this genus. It recalls to mind D.lateralis, mihi, from the island of Rodriguez, although it is sutficientlydistinct in form. The anterior side is longer, the beaks less lateral,and the height of the shell in proportion to the length is greater.45. Kellia jacksoniana. (Plate VII. figs. F, F 1.)Shell obliquely and subquadrately rounded, rather convex, palegrey, a little transparent towards the umbones, inequilateral ; anteriorend, or that toward which the beaks incline, much shorter thanthe posterior. Front margin obliquely curved ; base straightish,but little arcuate. Hinder extremity produced somewhat at thelower part. Surface a little glossy, concentrically striated, some ofthe striae towards the margin more pronounced than those nearer theumbones. The latter a trifle prominent above the hinge-line,approximated, terminating in an incurved vitreous glossy apex.Teeth strong ; in the right valve one immediately beneath the umboand another posterior to the ligament ; the left valve has two beneaththe umbo and one posterior to the ligament. Muscular scarslarge, placed high up, the anterior subpyriform, the posterior longer.Pallial impression joining the scars high up on their outer margin.Length 7 millim., width 8i, diam. of closed valves nearly 5.Hab. Port Jackson {Coppinger).K. rotunda, Deshayes, and K. soUda, Angas, are also Port-Jacksonspecies and the nearest allies of the present one. The former isalmost as long as broad, nearly equilateral, of a thinner growth,and has slighter teeth ; the latter is more solid, more transverse,rather more equilateral, is opaque white, highly glossy, has theinterior thickened and subpuuctate, and the pallial impressionappears to join the lower extremity of the muscular scars.46. Scintilla ciivieri.Deshmjes, Proc. Zool. Soc. 1S55, p. 174 ;Soioerhy, Tlies. Conch, vol. iii.p. 180, pi. 23.5. figs. 59, 60 ; id. Conch. Icon. figs. 15 a, b.? Var. =S. flavida, Deshayes, I. c. p. 175 ; Sowerby, Thes. fig. 64; Conch.Icon. fig. 24?Hah. Port Molle, Queensland {Coppinger) ; Baclayon, island ofBohol, Philippines {Cuming) ; Basay, island of Samar (Cuming, foryar. flavida).The figures of this species in the ' Conch. Icon.' are most inaccurate,and that in the ' Thesaurus,' although much better, is notquite correct. The umbones are smaller, more acute, and inclineanteriorly, and the colour is not nearly so bright as depicted inthe figure. The representation of the var. flavida, fig, 64, is stillmore unfaithful ; the hinder margin is not obliquely truncate, butcurved. I cannot discover any material distinction in this variety.It is smaller, which may be a matter of age, and the type is slightlynarrower than the type of S. eavieri ; but of both forms I have