108 NEW-YORK FAUNA — MOLLUSCA. 



Margarita arctica. 



PLATE VI. FIG. 107. 



(STATE COLLECTION.) 



Margarita arctica. Leach, Ross's Voyage 1819, appendix. 

 Turbo inflatus. Totten, Am. Jour. Sc. Vol. 28, p. 363, fig. 5. 

 T. id. Russei., Essex Jour. Nat. Hist. Vol. 1, p. 73. 

 M. arctica. Gould, Invertebrata of Mass. p. 255, fig. 1G3. 



Description. Shell small, thin, translucent, shining and globular. Whorls five, convex, 

 obsoletely and transversely striate, and with revolving minute lines on the base : spire low, 

 convex, and shorter than the aperture ; suture impressed ; aperture large, circular and ex- 

 panded ; lip simple, sharp, and somewhat reflected at the umbilicus, which is large and deep. 

 Opercle horny, multispiral. 



Color. Pale brownish yellow or horn-color, immaculate, of a somewhat pearly lustre, and 

 feebly iridescent. 



Length, ' 2. Width, 0-25. 



This has not been observed as yet nearer to our shores than the coast of Massachusetts. 



Margarita cinerea. 



PLATE VI. FIG. 113. 



(STATE COLLECTION.) 



Turbo cinereut. Couthouv, Bost. Jour. Nat. Hist. Vol 2, p. 99, pi. 3, fig. 9. 

 M. cmerta. Gould, Invertebrata of Mass. p. 252. 



Description. Shell small, thin, pyramidal. Whorls five to seven, and rendered angular 

 by four to six revolving elevated ribs, diminishing in number as they approach the apex : 

 central rib largest ; surface with minute oblique stria?, not interrupted by the ribs, and giving 

 a somewhat nodulous appearance ; umbilicus broad and deep ; lip sharp ; aperture circular, 

 slightly angulated at the junction of the outer lip, which is crenulated by the termination of 

 the striae, and slightly reflected over the umbilicus. Opercle horny, transparent, multispiral. 



Color. Uniform ashen, slightly tinged with green. 



Length, 0*5. Width, 0-4. 



From the stomachs of fishes on the coast of Massachusetts, and on the coast of Maine. 



