MARGARITA. 279 



Margarita cinerea. 



Shell low-conical, thin, ash colored, unibilicated, with four to six elevated and 

 numerous smaller revolving ridges, and regular, eroded, elevated lines of growth. 



Turbo cincreus, CouxnouY, Bost. Journ. Nat. Hist. ii. 99, pi. 3, fig. 9. 



Trochus costalis, Loven, in letters. 



Margarita cinerea, Gould, Inv. 1st cd. 252. — De Kay, N. Y. Moll. 108, pi. 6, fig. 113. 



— SxiiMPSox, Clieek Lists, 4. 

 Mnrqarlta striata, Broderit and Soweeby. 

 Margarita sorclida, Hancock. 



Shell small, tliiu, of a low conical or pyramidal shape ; color a 

 dull ashy-white, sometimes tinted with green ; whorls five to seven, 

 convex, and rendered angular by prominent, irregularly 

 disposed revolving ridges, of which from four to six are ^'°' 

 more elevated, with less conspicuous intervening ones ; and 

 the lowest of these elevated ridges forms a limit, at which 

 the whorl slopes abruptly, and presents a broad, slightly ^^ cinerea. 

 convex base, marked with fine, equal, and equidistant re- 

 volving lines ; the whole surface is also covered with crowded, very 

 fine, and distinctly prominent Hues of growth; the umbilicus is broad 

 and deep, and bounded by the last revolving line, Avhich forms an 

 angle terminating at the most anterior point of the otherwise circu- 

 lar aperture, and here causes an angular prolongation ; outer lip 

 regularly curved, sharp, finely scalloped ; it rises on the left margin, 

 and terminates just behind the uml>ilicus, slightly expanding and 

 partially covering it ; a very thin stratum of enamel sometimes ex- 

 tends across the body of the shell ; throat within with lines corre- 

 sponding to the external marking ; operculum circular, multi-spiral. 

 Height, four fifths of an inch ; base a little less. 



Found in a very fresh and Ijeautiful condition, but rather rare as 

 yet, in the stomachs of fishes caught in Massachusetts Bay. Grand 

 Manan to Cape Cod (^Stimpson) ; Halifax (^Willis) ; N. W. of Green- 

 land (^Hai/es) ; St. Anne, &c. (Bell). 



It is distinguished by the lieautiful, sharp lines of growth, which 

 are not interrupted by the spiral ridges, and by these ridges cover- 

 ing all the base ; also, by the slight projecting angle of the aper- 

 ture. It is very closely allied to 31. striata, Broderip and Sowerby, 

 " Zool. Journ." iv. 371, and figured in Sowerby's " Conch. Illust." 

 (^Ma)'g-arUa), fig. 3. By the kindness of Mr. Sowerby, liowever, I 

 have been enabled to compare the two. In M. striata the whorls 

 are not angulated by the revolving lines, the largest of which are 



