220 SMITH : ON THE GENUS AST ARTE. 



tion de Mr. Spengler, comme variete de la Vejiiis borealis de 

 Linnaeus." 



Although the variety semisidcata Leach, is generally fairly 

 recognisable by its more compressed form and stronger sculpture, 

 especially towards the beaks, still all the intermediate and 

 connecting links between it and typical examples of A. borealis 

 are met with, and it becomes a matter of impossibility to draw 

 any fixed line of demarcation. To the typical form belong atra 

 Pallas teste Middendorff, borealis Nilsson, compressa Martens 

 partly, corrugata Brown, depjxssa Brown perhaps, and cyprinoides 

 Duval, and the following more closely approach the variety 

 setnisulcata, viz. : — veneriformis Wood, ladea Broderip and Sov/., 

 and richardsoni Reeve. 



12.— ASTARTE ROLLANDII Bernardi. 



Jour., de Conchyl., 1858, vol. vii., p. 386, pi. xiii., f 4. 



Habitat. — Petropaulovski, Kamtchatka. 



This species is remarkable on account of its very circular 

 form and the great thickness of the hinge. It appears to 

 approach more closely A. borealis than any other species. 



13.— ASTARTE FABULA Reeve. 



1855. A. fabula Reeve. Belcher's Last Arctic Voy., vol. ii., 



p. 398, pi. xxxiii., f. 5(7 — b. 

 1874. A. semilirata Sowerby. Con. Icon., vol. xix., f 15. 

 1877. A. fabula Smith. Annals Mag. Nat. Hist., Aug., 1877, 



vol. XX., p. 144. 

 1877. A. fabula Jeffreys. Annals Mag. Nat. Hist, Sept., 1877. 



vol. XX., p. 234. 

 Habitat. — Dumbbell Harbour and Discovery Bay (Feilden); 

 Regent Inlet (Ross) ; Cape Bowen (Dr. Sutherland) ; Franz 

 Joseph's Land (Leigh Smith). 



J.C, iii., July, 1881 



