M0LLTT8CA. 105 



guishing character in species of this genus. It recalls to mind D. 

 lateralis, mihi, from the island of Rodriguez, although it is sufficiently 

 distinct in form. The anterior Bide is longer, the beaks loss 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 suhquadrately rounded, rather convex, pale 

 grey, a little transparent towards the umbones, inequilateral ; ante- 

 rior end, or that toward which the beaks incline, rnuch shorter than 

 the postorior. Front margin obliquely curved ; base straightish, 

 but little arcuate. Hinder extremity produced somewhat at the 

 lower part. Surface a little glossy, concentrically striated, some of 

 the stria) towards the margin more pronounced than those nearer the 

 umbones. The latter a trifle prominent above the hinge-line, 

 approximated, terminating in an incurved vitreous glossy apex. 

 Teeth strong ; in the right valve ono immediately beneath the umbo 

 and another posterior to the ligament ; the left valve has two be- 

 neath the umbo and one posterior to the ligament. Muscular scars 

 la rge, placed high up, the anterior subpyrif orm, 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. solida, Angas, are also Port-Jackson 

 species and the nearest allies of the present one. The former is 

 almost 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 the 

 interior thickened and subpunctate, and the pallial impression 

 appears to join the lower extremity of the muscular scars. 



46. Scintilla cuvieri. 



Deshayes, Proc. Zool. Soc. 1855, p. 174 ; Sotverby, Thes. Conch, vol. iii. 



p. 180, pi. 235. figs. 59, 60 ; id. Conch. Icon. figs. 15 a, b. 

 ? Var. =S. flavida, Deshayes, I. c. p. 175 ; Soioerby, Thes. fig. 64; Conch. 



Icon. fig. 24 ? 



Hab. Port Molle, Queensland (Coppinger) ; Baclayon, island of 

 Bohol, Philippines (Cuming) ; Basay, island of Samar (Cuming, for 

 var. flavida). 



The figures of this species in the ' Conch. Icon.' are most inaccu- 

 rate, and that in the 'Thesaurus,' although much better, is not 

 quite correct. The umbones arc smaller, more acute, and incline 

 anteriorlv, and the colour is not nearly so bright as depicted in 

 the figure. The representation of the var. flavida, fig. 64, is still 

 more unfaithful ; the hinder margin is not obliquely truncate, but 

 curved. I cannot discover any material distinction in this variety. 

 It is smaller, which may be a matter of age, and the type is slightly 

 narrower than the type of S. cuvieri ; but of both forms I have 



