206 SMITH : ON THE GENUS ASTARTE. 



1874. Astarte intermedia, id. I.e., f. 13. 



1875. A. com pressa (Linn. Venus) Morch. Arctic Man., p. 131. 

 1878. A. compressa G. O. Sars. Norg. Arkt, Fauna, p. 53. 



Habitat. — Greenland, Finmark, Scotland, Newfoundland, 

 east coast of northern United States, Baltic, Nova Zembla, Franz 

 Joseph Land. 



This species is readily separable from A. sulcata, the only 

 one with which it is likely to be confounded, by 11% generally more 

 elliptic or transversely elongate form and the constafit absence of 

 crenulation within the margin of the valves in adult specimens, 

 although approximations of form are met with, still the prescence 

 or absence of the crenulation at maturity determines the species. 



2._ASTARTE UNDATA Gould. 



1841. Invert. Mass., 1841, p. 80; ed. 2, p. 121. 



1841. A. sulcata Gld. (non Da Costa), I.e., f. 46; ed. 2,f 432. 



1843. A. undata Mighels. Bost. Journ. Nat. Hist., vol. iv., 



P- 319- 

 1843. Crassina latisulca Hanley, 1843. Rec. Biv., p. 87 



(note); p. 350, pi. xiv., f. 35. 

 1845. Astarte undata Philippi. Abbild., ii., p. 55, pi. i., 



f. I. 

 1854. A. undata Sow. Thes., vol. ii., p. 779, pi. clxvii., f 12. 

 1858. A. undata Adams. Genera, vol. ii., p. 484. 

 1863. A. sulcata Jeffreys, partim. Brit. Con., ii., p. 315. 

 1872. A. sulcata Tryon, partim. Proc. Acad. Nat. Sci. Philad., 



1872, p. 247. 

 1872. A. undata Verrill. Amer. Jour. Sci. and Arts, vol. iii., 



p. 287. 

 1874. A. undata Sowerby. Con. Icon., xix., f. 11. 

 1874. A. mortoni Sowerby, I.e., f. 14. 



J.C, iii., July, 18S1 



