154 



FAMILY VENEEIDA:. 



Genus Chione. 



synopsis of the species. 



a. Lamella? thin, erect. 



a. Lamella? distant, interspaces concentrically striated. 



Shell ovately-oblong, anterior side snbangulated ; 

 lamella?, about twelve. G. Allporti. 



Anterior side rounded ; lamella? numerous. 



C. multilamellata. 



b. Lamella? distant, interspaces with radial riblets. 



Cordately ovate, ventricose. C. liormophora. 



Ovately-oblong, less inflated. C. dimorphophylla. 



c. Lamellae crowded ; cordately ovate. C. Cainozoica. 



b. Lamella? thick, or concentrically ridged. 



Trigonal, with fifteen lamella?. C. subroborata. 



Transversely oval, with twenty or more ridges, radially 



striated. G. propinqua. 



c. Surface with radial riblets, decussated by concentric- 



stria?. G dictua. 



d. Surface smooth, concentrically grooved. C. Corioensis. 



Chione Allporti, Ten ison- Woods. 



Reference. — Venus Allporti, Tenison-AVoods, Proc. Roy. Soc. 

 Tasmania for 1875, p. 26, t. 3, f . 10. 



Ovate, oblong, depressed ; anterior side very short, its margin 

 somewhat angulated ; ornamented with twelve concentric- 

 appendiculate lamella?, and concentric stria? ; the ventral aspect 

 of the frills is slightly vertically wrinkled. Margin of the 

 valves minutely crenulated. 



Dimensions. — Anteroposterior diameter, 30 ; umbo-ventral 

 diameter, 22 millimetres. 



Locality. — Table Cape (type in Hobart Mus. !) 



This fossil differs from the living C. lamellata by its more ob~ 

 long outline, the post-dorsal and ventral margins being nearly 

 parallel, whilst the anterior margin is more rapidly descending,, 

 and the ventral margin not so arched ; the umbo is more an- 

 terior, and the frills are simple, and about twice the number. 



Chione multilamellata, spec. nov. Plate xv., figs. 6a— 66. 



Ovately-oblong, thin, moderately convex ; umbones ante- 

 median, inflated, curved forwards ; anterior margin rounded, 

 posteriorly roundly truncated ; ventral margin regularly 

 arched ; post-dorsal margin slightly arched, more rapidly 

 sloping than the shorter, nearly straight front dorsal margin. 

 Lunule broadly cordiform, much raised along the middle line,, 

 and sculptured with fine lamella? of growth. 



The surface is closely lamellated, concentrically lirate and 



