WALDHEIMIA. 211 



Lapland and Sitka (^Middemlorff^. It lias been found fossil at 

 Beauport (Duu'son) ; and at Cape Hope, James's Bay, 52° 10' N. 

 {Drc.vler Coll.). Hence, though nowhere abundant, this species 

 seems to be circumpolar. The young specimens are fragile and 

 sea-green ; but the old ones become solid, globose, and tar-colored. 



Oeuus ^VALDIIEI.HIA, King. 



Shell smooth. The genus Waldheiniia has the internal append- 

 age composed of two free slender branches arising from the hinge, 

 which advance about two thirds the distance across the shell, then 

 curve upwards and backwards, then inwards, and unite at the 

 centre. 



Waldlieimia cranium. 



Surface smooth, whitish, minutely punctured. 



Anomia cranium, Gmel. Syst. Nat. 3347. — Turton, Conch. Diet. 5. 



Terehratula cranium, Mijller, Zool. Dan. Prodr. 249, No. 3006. — Montagu, Trans. Lin. 

 Soc. xi. 188, pi. 13, fig. 2. — Brown, 111 Conch. Gr. Brit. 68, pi. 22, figs. 10-12.— 

 ToRBES and Hanl. Brit Moll. ii. 357, pi. 57, fig. 10. — Loven, Iml. Moll. Scand. 29. 



A single specimen, obtained Ijy Mr. Willis at St. Margaret's Bay, 

 seemed to me to come under this species. The specimen was small 

 and imperfectly examined. It was rounded-ovate, rather globose, 

 thill and translucent, the surface without grooves, but finely punc- 

 tured ; color yellowish-white. The more minute characters were 

 not noted. 



