LAMELLIBRINCHIATA. 



27 



grooved on both sides, and four in the left valve grooved on one side 

 only. 



78. T. pectinata, Lamarh, Anim. sans vert., I.e., \\.,p. 514. 

 Loealitics. — Hampden. Living in Australia and Tasmania. 



The specimen is too imperfect to describe, but I see no reason for 

 supposing it to be another species. 



79. T. Semiundulata, McCoij ; Jenldns, Quar. Jour. Science, ii., 

 p. 630, pi. S,f. 7. Posterior side with about twelve transverse rounded 

 ribs, which are not quite so broad as the interspaces, and smooth 

 except near the umbo, where they are moniliform ; remainder of the 

 shell with low, slightly undulating, concentric thin ribs, crossed by 

 radiating lines near the umbo. 



Localities. — Avvamoa. A fragment only. 



Family — Arcii)^. 

 BARBATIA. 



80. B. Sinuata, Lamarh ; Cat. Marine 3Ioll.,p. 79. 

 Localities. — Wanganui (u) ; Shakespeare Cliff. 



CUCULLiEA. 



Equivalve, inequilateral, veutricose, radiately striated ; hinge with 

 the teeth dilated and bent down at the outer ends, divided into a few 

 large longitudinal plaits ; ligamental area moderate, smooth. 



The New Zealand tertiary Ciicullceas are very difficult to distinguish 

 from one another, as their external markings are alike, and they may 

 perhaps be all forms of one species. 



81. C. ponderosa, sp. nov. Yentricose, nearly as high as long, 

 posterior side rather Ihittened ; umbones distant, hinge at right angles 

 to the axis of the shell. Height, 4 ; length, 4'3. 



Localities. — Korakonui, East Coast, Wellington ; Lake Wakatipu ; 

 Awatere(?). 



Var. B. — Longer. Height, 3'7 ; length, 4-5. 

 Localities. — Waikari, Canterbury ; AVhangarei. 



82. C. WOrthingtoni, sp. nov. Ventricose, much larger than 

 high ; posterior side produced, rather dilated ; umbones distant ; hinge 

 at right angles to the axis of the shell. Height, 2-9; length, 4. 



Localities. — Waitaki ; Lake Wakatipu. 



83. C. alta, Sowerhy (in Darwin's Geo. Ohs. on South America, p. 

 252). Yentricose; nearly as high as long; posterior side rather pro- 

 duced and rather flattened ; umbones distant ; hinge sub-oblique. 

 Height, 2-4; length, 2'8. 



Localities. — Raglan ; Curiosity Shop ; Tokomairiro ; East Coast, 

 Wellington ; Kokohu ; Lake Wakatipu ; Lyndon ; Callighan's Creek. 

 Var. B. — Longer. Height, 3*4 ; length, 4. 

 Localities. — Callighan's Hill, east side. 



