286 MAEGARITA. 



the umbilicus ; surface very bright, shining, polished, and smooth 

 except for fine subobsolete concentric lines around the umbilicus ; 

 spire conoidal ; apex minute but obtuse ; suture impressed ; whorls 

 about 5, convex, the last -very rapidly widening, somewhat descend- 

 ing toward the aperture ; aperture rounded, oblique, angular 

 above, nacreous inside, the pearly iridescence often visible through 

 the shell ; umbilicus narrow, profound, its opening regularly 

 curved, not separated from the base by a carina. 

 Alt. 6, diam. 7 mill. ; alt. 4, diam. 5 mill. 



England, Scandinavia, Neiv England, northward to Spitzbergen, 

 Greenland and Beliring Straits. ( West America south to Washing- 

 ton Territory?) 



Turbo helicinus O. FABR. Fauna Groenland., p. 393. Margarita 

 helicina, MOLLER, Ind. Moll. Groenl., p. 8. LOVEN, Ind. Moll. 

 Scandin., p. 20. GOULD (Binney's ed.), p. 281, f. 542. SARS, 

 Moll. Reg. Arct. Norveg., p. 132, t. 21, f . 3 ; t. iii, f. 7, 8 (denti- 

 tion). SOWERBY in Reeve, Conch. Icon., f. 15. Trochus helicinus 

 FORBES & HANLEY, Hist. Brit. Moll, ii, p. 531, t. 68, f. 4, 5 ; t. 74, 

 f. 10 ; t. 200, f. 4 (animal). JEFFREYS, Brit. Conch., iii, p. 295 ; v. t. 

 61, f. 4. PHILIPPI, Conchyl. Cab., p. 250, t. 37, f. 10. Tr. 

 neritoideus GM. teste Forbes & Hanley. Turbo margarita 

 MONTAGU, Test. Brit, suppl., p. 143. TURTON, Conch. Diction., p. 

 229. LOWE, Zool. Journ. ii, p. 107, t. 5. f. 10, 11. Helix margarita 

 LASKEY, Mem. Werner Soc. i, p. 408, t. 8, f. 5. FLEMING, Encyc. 

 Edin., t. 203, f. 9 (teste F. & H.). Trochus margarita PHILIPPI, 

 Conchyl. Cab., p. 248, t. 37, f. 7. BROWN, Illust. Conch. Gt. Brit., 

 p. 17, t. 10, f. 28, 29. Margarita vulgaris LEACH, mss. in Sowerby, 

 Mid. and Conch. Magazine, p. 24. SOWERBY, Conch. 111. Mar- 

 garita, f. 13. f Margarita arctica LEACH in Ross's Voyage of 

 Discovery of H. M. S. Isabella and Alexander, to Baffin's Bay, 

 etc., Appendix no. ii, p. 61 (first species of Margarita.), 1819. 

 GOULD, Invert, of Mass., p. 255, f. 163. SOW T B., Mai. and Conch. 

 Mag. i, p. 25 ; Conch. 111., f. 6. PHILIPPI, Conchyl. Cab., p. 248, t, 

 37, f. 8. DEKAY, Mollusca of New York, p. 108, t. 6, f. 107. 

 SOWB. in Rve. Conch. Icon., f: 19. Turbo inflatus TOTTEN, Silli- 

 man's Journ. Sci., xxvi, p. 368, f. 5. Marg. helicoides BECK MS. 

 teste Sowb. Margarita cowpanulata MORSE, Mem. Bost. Soc. N". H. 

 i, p. 284, t. 7, f. 15. BINNEY'S Gould, Inv. Mass., p. 282, f. 543. 

 Tr. borealis PHILIPPI, Conchyl. Cab., p. 283, t. 42, f. 1. M. arctica 



