88 AMERICAN MARINE CONCHOLOGY. 



1. M. occiDENTALis, Migliels and Adams. Fig. 169. 



(TrocJius.) Bost. Journ. Nat, Hist., iv. 47, t. 4, f. 16. 1842. 



Margarita alabastrum, Beck. 



Shell small, rather solid, siibtranslucent, pale horn-color, with 



light brown revolving carinaj, three in number on the upper 



whorls, and from four to six on the body-whorl ; whorls seven, 



convex, with distinct sutures ; spire small ; the body-whorl large, 



with coarse revolving striae around the indented umbilical region. 



Height 12.5, diam. 10 mill. 



Maine. (Eur.) 



2. M. ciNEREA, Couthouy. Fig. lYO. 



iTiirbo.) Bost. Joura. Nat. Hist., ii. 99, t. 3, f. 9. 1838. 

 Shell small, thin, pyramidal ; whorls five to seven, with several 

 revolving ribs, the central one largest ; umbilicus broad and deep ; 

 lip sharp ; aperture circular, slightly reflected over the umbilicus. 

 Ashen-graj"^ or greenish. 



Height 12.5, diam. 10 mill. 



Ifeio England. (Eur.) 



3. M. OBSCURA, Couthou3\ Fig. lYl. 



(Turbo.) Bost. Journ. Nat. Hist., ii. 100, t. 3, f. 2. 1833. 



Depressed, conical, solid ; spire obscure, reddish-brown, base 



ash-colored ; whorls angulated by two or three revolving ridges ; 



lines of gi'owth coarse; aperture circular; pearly within. 



Height 10, diam. 15 mill. 



I^ew Engla nd. ( En r. ) 



4. M. VARicosA, Mighels and Adams. Figs. 112, 118. 



Bost. Journ. Nat. Hist., iv. 46, t. 4, f. 14. 1842. 

 Margarita acuminata, Mighels and Adams, ib. f. 15. 1842. 



Shell small, conical, thin, dingy white or drab-color; whorls 

 four, convex, with numerous longitudinal oblique ribs, and 

 crowded revolving strite. Suture distinct, subcanaliculate ; um- 

 bilicus rather large and deep, bounded by two rather rugged 

 varices. Aperture circular, lip sharp. 



Height 6.25, diam. 6.25 mill. 



New England, northioards. (Eur.) 



M. acuminata is the young of this species. Fig. ItS repre- 

 sents it. 



5. M. MiNUTissiMA, Mighels. Fig. 173. 



Bost. Journ. Nat. Hist., iv. 349, t. 16, f. 5. 1843. 

 Shell very minute, subovately globose ; whorls three, convex, 



