OF SANTO DOMINGO. 



221 



MARGINELLA. Lam. 



M. coniform is. Sby., Quart. Jour., Vol. VI., p. 45. 

 " Id. Guppy, loc. cit. Vol. XXII., p. 288, pi. 17, fig. 2. 



A veiy variable species whicli I have failed to divide after a careful study of its 

 modifications. It is sometimes broad, sometimes slender ; the spire is sometimes ele- 

 vated, sometimes depressed, and some of the mature shells arc twice as large as 

 others. Still, the gradations between all of these variations are so numerous and so 

 complete that I am forced to consider them all one species. 



M . (Glabella) S o w e r b y i . Gabb, u. s. 



Shell volutiform, spire high, whorls five ; body whorl regularly tapering in advance. Aperture linear, inner 

 lip with four folds, the last one terminal and all slightly grooved on the summits ; outer lip with numerous small 

 teeth, one or two at the posterior end, larger than the others. Length .6 inch, width .45 inch. 



Easily recognized by its high spire and by the sulcate columellar folds. 



M. chrysomelina. Rodf. Am. N. Y. Lye, N. Hist., Vol. IV, p. 492, pi. 17, fig. 2. ' ' ■ 



M. pudica. Gaskoin, Proc. Zol. Soc, 1849, p. 18. . - 



Rare — Living in the West Indies. 



^ STROMBINA. Morch. ' 



S. gradate. Guppy. . , 



Golumbella id. Guppy, Quart. Jour., Vol. XXII., p. 288, pi. IG, fig. 10. 



In a note Mr. Guppy refers this species to Strombina and suggests relationship 

 with Pleurotoma. The shell is characterized by two or three prominent tubercles of 

 variable size on the upper part of the body whorl, which give it a triangular form. These 

 are variable; sometimes very prominent, in other cases almost wanting. 



S. amhigua. Guppy, loc. cit., p. 288, IG, fig. 8. 



Has not been found in Santo Domingo. 



S . i n fl a t a . Gabb, n. s. 



Shell elongate, spire elevated, whorls eight, convex on the sides and truncated adjoining the suture. Surface of 

 the body whorl transversely striate in advance. Aperture narrowed in advance, canal somewliat recurved ; inner lip 

 encrusted and transversely striate ; outer lip but slightly thickened and interiorly striate, but not denticulated. 



In size and general appearance, this shell is not unlike S. gradata, but it dilfers 

 from that species in its much broader body whorl, shorter spire, in the absence of all 

 ornament excejjt a few revolving strise in advance and in the outer lip being slightly 

 thickened and striate internallv instead of being: denticulated. 



S. Haitensis. Sby., sp. 



Golumbella TIaitensis, Sby., Quart. Jour., Vol. VI., p. 4G. 

 S . C a r i b 33 a . Gabb, n. s. 



Shell small, robust, spire high, whorls nhie, minutely truncated on the upper margin ; body whorl marked by a 

 few revolving strife in advance and with a thickening opposite the lip, making a sub-elliptical cross-section. Aper- 

 ture broad ; outer lip very thick, with a few teeth internally, the internal notch remote from the posterior angle. 

 Inner lip encrusted and with four or five minute teeth. Canal very short and recurved. 

 A. P. S. — VOL. XV. 3d. 



