FAMILY TURBINHXE MARGARITA. 107 



GENUS MARGARITA. Leach. 



Shell conical, moderately elevated. Whorls few, subinflated ; aperture rounded, imperfect 

 posteriorly ; lip sharp ; umbilicus deep. Opercle multispiral ; the nucleus central. 



Obs. This genus, instituted by Dr. Leach, includes a number of small marine shells 

 hitherto included under the genus Turbo. 



Margarita ornata. 



PLATE VI. FIG. 104. 



(STATE COLLECTION.) 



Description. Shell moderately solid, subconical ; its transverse exceeding its vertical 

 diameter. Whorls four to five, convex ; the body-whorl very large, subinflated. Seven to 

 nine distant revolving costas on its upper surface, which is separated from the simply striate 

 surface beneath by an obsolete carina. Spire scarcely much elevated, faintly striated ; 

 umbilicus large and very profound ; aperture rounded, oblique ; lip thin and simple, entire. 



Color. Bright red. 



Length, 0-1. Width, 0'15. 



I have met with many specimens of this beautiful shell, collected on the shores in the 

 neighborhood of New-York. It is somewhat allied to M. undulata, but is much larger, and 

 the costae subequal. 



Margarita undulata. 



Margarita undulata. Sowerby, Malac. and Conch. Mag. ], p. 26. 



Turbo incarnalus. Coothouy, Bost. Journ. Nat. Hist. Vol. 2, p. 98, pi. 3, fig. 13. 



M. undulata. Gould, Invertebrata of Mass. p. 254, fig. 162. 



Description. Shell orbicular, small, smooth and shining. Whorls four to five, convex, 

 impressed with numerous striae alternating with others still finer, undulated near the sutures by 

 short folds or wrinkles : sutures distinct ; basal striae much finer than those above ; umbilicus 

 large, extending quite to the apex, and partially covered by the reflected inner lip ; aperture 

 nearly circular, very oblique. Opercle thin, horny, multispiral. 



Color. Uniform red, of various shades. 



Length, 0"3. Width, 0"4. 



This boreal shell was discovered nearly simultaneously by Messrs. Couthouy and Sowerby, 

 the latter having the priority of publication. It has been found in the stomachs of fishes, 

 and along the seacoast of Massachusetts. It will probably be detected on our own coast. 



14* 



