46 Mighels^ and Adams^ Descriptions of 



MARGARITA VARICOSA. 



Plate IV. Fig. 14. 



M. testa parva, tenui, conica ; anfractibus quatuor, convexis ; longitudinaliter 

 costulatia, transverse striatis j sutura sub-canaliculata ; umbilico magno, profando. 



Shell small, thin, low, conical, of a dingy white or drab 

 color ; whorls four, convex, covered with numerous longitu- 

 dinal, oblique ribs, intersected by a great number of treuis- 

 verse, revolving striae, which are most conspicuous on the 

 lower part and base of the lower whorl. The striae on the 

 upper part of the whorls can only be seen with a magnifier. 

 Suture distinct, sub-canaliculate ; umbilicus rather large and 

 deep, bounded by two rather rugged varices, intersected by 

 the ribs which are continued to the verge of the umbilicus ; 

 aperture circular ; labrum simple, sharp ; within perlaceous. 



Height, ,25 inch ; diameter of base equal to the height ; 

 divergence, 90 degrees. 



Habitat. Bay Chaleur ; taken from the stomach of a cod- 

 fish, {Morrhua Americana, Storer,) in the summer of 1841, 

 by our fisherman, Mr. Foster. 



Remarks. Only a single specimen of the above dimen- 

 sions has been obtained, and one other, much smaller and 

 somewhat worn. It is easily distinguished from all its con- 

 geners by the longitudinal, oblique ribs, and the two varices 

 at the base. It is in the cabinet of J. W. Mighels. 



MARGARITA ACUiMINATA. 



Plate IV. Fig. 15. 



M. teslA parva, orbicular!, tenui, albicante ; [spir^ acuminata ; anfractibus 

 quatuor, rotundatis, laevibus; sutura valde imprcBsa ; apertura orbiculaii, intus 

 iridescente ; umbilico parvo. 



Shell small, orbicular, sub-conical, thin, of a grayish white 

 or russet-color ; spire acuminate ; whorls four, well rounded, 

 smooth, covered with a thin, semi-transparent epidermis,- 

 striae of growth very fine and compact ; suture well impressed ; 

 aperture orbicular, considerably oblique, beautifully iridescent 

 within ; operculum horny, spiral. 



