292 MARGARITA. 



more regular and equal, 8 to 12 in number; base radiately densely 

 striate ; upper part of the whorls often with small ill-defined folds. 

 Spire elevated ; apex minute, rather obtuse ; upper three whorls 

 strongly carinate ; antepenultimate generally bicarinate ; last whorl 

 subangular at the circumference, flattened, only slightly convex on 

 the base ; aperture subcircular, slightly subangular above and at 

 base of the columella, oblique, lined with silvery iridescent nacre; 

 outer lip simple, columellar lip a little straightened in the middle, 

 forming an obtuse angle at its junction with the basal lip ; umbilicus 

 marked only by growth-lines within, bounded by an angle. 

 Alt. l],diam. 10 mill. 



Massachusetts, Hebrides, Norway vorthward ; BeJirivg Sea. 



Margarita striata Brod. & Sowb. in Zool. Journ. iv, 1829, p. 371. 

 — SowERBY, Mai. and Conch. Mag. i, p. 25 ; Conch. III., £ 3, 18.— 

 MiDDENDORFF, Mai. Rossica ii, p. 74.— Sowb. in Reeve, Conch. 

 Icon., f. 7 (Not M. striata Leach). — 31. maxima Sowb., /. c, f. 24. — 

 Turbo cinereus Couthouy, Journ. Bost. Soc. N H. ii, p. 99, t. 3, f. 

 9 (1838'39).— Jf. cinerea Gould, Invert, of Mass., p. 252 ; Binney's 

 ed., p. 279, fig. 539.— DeKay, N. Y. Moll, p. 108, t. 6, f. 113.— 

 Sars, Moll. Reg. Arct. Norv., p. 134, t. 9, f 1 ; t. 21, f. 4, 5 ; t. iii, f. 

 11 (Dentition). — Tr. cinereus Couth. Jeff., Brit. Conch, v (suppl ), 

 p. 202. — Leche, Kongl. Sven. Vet. Akademieus Handl., xvi, p. 42 

 (Nova Zembla!). — (not Tr. cineretis Da Costa, Brit. Conch., p. 42, 

 t. 3, f. 9, 10, and of some other English authors, a species synony- 

 mous with the West Indian Tr. (Omphalius) excavatvs Jjam.). — 31. 

 sordidaHAyscocK, Ann. & Mag. N. H. 1846, xviii, p. 324. — Trochus 

 polaris Phil., Conchyl. Cab., p. 249, t. 37, f 9. — Turbo corneus 

 KiENER, Species et Icon, genre Turbo, t. 19, f. 2. — Trochvs corneus 

 Fischer, Coq. Vivantes, p. 70, 1. 19, f. 2 (genre Turbo).— 31a rgarita 

 cornea Sowerby in Reeve, Conch. Icon., f 21. — T. {Margarita) 

 beecheyanus von Martkns, Mai. Blatter, xix, p. 89, t. 3, f 1, 2. — 

 M. striata Brod. & Sby. Friele, Norwegian North Atlantic Expedi- 

 tion, Moll., ii, p. 31, and var. margaritifera Friele, I. c, p. 32, t. 

 12, f. 2, 3. 



A variable species. The dense fine striation, coarse spiral liration 

 of the upper surface and more finely, regularly lirate base are the 

 more obvious characters. In some specimens the basal lirse are 

 almost obsolete except around the umbilicus ; figs. 27, 28, pi. 60, 



