MARINE MOLLUSCA OF THE UNITED STATES. 89 
longitudinally furrowed; spire short, obtuse; suture strongly 
impressed, aperture orbicular; umbilicus large, deep. Dull ash- 
color. 
Height 5, diam. 5 mill. 
’ Casco Bay, Maine. 
6. M. unpunaTA, Sowerby. Fig. 174. 
Malacol and Conch. Mag. i., 26. 
Margarita striata, var. Grenlandica, Moller, Ind. Moll. Green. 1842. 
Turbo incarnatus, Couthouy, Bost. Journ. Nat. Hist., ii. 98, t. 3, f. 18. 1838. 
Trochus tumidus, Montagu, Leth. Suey. t. 30, f. 8. 
Shell orbicular, small, smooth and shining; whorls four or 
five, convex, with numerous strie, alternately finer and undulated 
near the sutures by short folds or wrinkles ; umbilicus quite large 
and deep; aperture nearly circular, very oblique. Uniform red 
of various shades. 
Height 7.5, diam. 10 mill. 
New England. (EHur.) 
Trochus Grenlandicus, Chemnitz, 1781, may be this species. 
7. M. wentorna, Fabricius. Fig. 175. 
(Turbo.) Fauna Grenl. 1780. 
Margarita arctica, Leach, Ross’ Voyage. 1819. 
Turbo inflatus, Totten, Am. Journ. Science, xxvi. 368, f. 5. 18384. 
Shell small, thin, translucent, shining and globular; whorls 
five, convex, with revolving minute lines on the base; spire low, 
convex ; suture impressed ; aperture large, circular and expanded; 
umbilicus large and deep. Pale horn-color. 
Height 5, diam. 6.25 mill. 
New England. 
8. M. cAMPANULATA, Morse. Fig. 176. 
Shell small, depressed, orbicular, smooth, shining, translucent ; 
spire minute, pointed, aperture large, companulate. Light olive 
or horn-color. 
Length 3.5, diam. 7 mill. 
New England. 
9. M. arGenTATA, Gould. Fig. 177. 
Invert. Mass. Edit. i. 256, f. 174. 1841. 
Trochus glaucus, Moller, Ind. Moll. Greenl. 1842. 
Shell minute, conical, with an obtuse tip; pearly white ; whorls 
four, convex, the last slightly angular, covered with fine, crowded, 
revolving lines; suture deep; aperture circular. 
Height 2.5, diam. 3 mill. 
New England. (Hurope.) 
