MARGARITA. 291 



garita striata LEACH in Appendix to Ross's Voyage to North Pole 

 (inadequately defined, but from types, teste Forbes & Hanley). 

 GRAY, Zool. Journ. ii, p. 567. Turbo carneus LOWE, Zool. Journ. 

 ii, p. 107, t. 5, f. 12, 13 ; Brit. Mar. Conch., p. 170. Margarita 

 carnea SOWB. Mai. and Conch. Mag., p. 25 ; Conch., Illust. f. 9. 

 BROWN, Conch. G. Brit., p. 17, t. 10, f. 36, 37. Trochus gronlandi- 

 cus umbilicatus, etc., CHEMNITZ, Conchylien Cab., v, p. 108, 1. 171, f. 

 1671 (1781), (iwt binomial}. T. grcenlandicus Chem. JEFFREYS, 

 Brit. Conch, iii, p. 298, t, 61, f. 5. (not T. gronlandicus Chem. 

 PmLippr, Conchy]. Cab., p. 247, t. 37, f. 5, a form probably equaling 

 M. helicina or M. umbilicalis). Margarita grdnlandiea SARS, Moll. 

 Reg. Arct. Norvegia?, p. 133, t. iii, f. 9 (Dentition). M. sulcataSo\\ T B. 

 Mai. and Conch. Mag. i, p. 26 ; Conch. Illust., f. 1. SOWB. in Reeve, 

 Conch. Icon., f. 3. Trochus rossii, PHIL., Conchy 1. Cab., p. 288, t. 

 42, f. 9. M. grcenlandiea Cheinn. LECHE, Kongl. Sw. Vetensk. 

 Akademiens Handlingar, xvi, p. 40, 1878, and vars. rudis, Icevigata 

 Morch, intermedia nov. (Nova Zembla). M. undulata Sowb. MID- 

 DENDORFF, Mai. Rossica, ii, p. 72. T. cinerareus O. FAB. Fauna 

 Groenl., p. 392. T.fabricii Phil., Conchyl. Cab., p. 284, t. 42, f. 2. 



The spiral riblets are much finer and more numerous than in M. 

 cinerea. Jeffreys describes var. albida, shell whitish ; var. dilatata, 

 more depressed and expanded at the sides, encircled on the upper 

 part by only a few spiral stria? or impressed lines; var. Iczvior 

 smaller, more conical, solid and glossy, quite smooth with the excep- 

 tion of one or two slight spiral ribs on the uppermost whorls, flesh 

 color. The M. undulata is a common species in collections; I have 

 seen numerous specimens of the form nearly smooth beneath. The 

 subsutural folds are often obsolete or nearly so. Sowerby's M.sul- 

 cata is figured on pi. 39, fig. 60. Philippi's poor figures of T. rossii 

 (=sulcata Sowb. teste Phil. !) are given on pi. 39, figs. 40, 41. 



The T. cinerareus Fab., fabricii Phil., is figured on PI. 39, figs. 

 53, 54. It is probably a variety. 



M. (.'ixEREA Couthouy. PI. 44, figs. 20 ; pi. 60, fig. 29 ; pi. 44, fig. 

 25 ; pi. 37, fig. 5. 



Shell umbilicate, conical, thin, cinereous or brownish colored; 

 surface lusterless, finely, sharply densely obliquely striate, spirally 

 lirate ; the lira? are coarse and unequal, 2 to 4 being more prominent 

 on the upper surface, those on the base are decidedly smaller, closer, 



