208 



Ojst the topography and geology 



T. (Surcula) lougicaudata. Gabb, n. s. 



Shell long, slender fusiform ; spire elevated, somewhat shorter than the body whorl ; whorls ten, the upper ones 

 prominent in the middle, slightly concave near the suture. Suture impressed, bordered by a thickened anargin. 

 Body whorl long, slender, outlines gently sinuous. Canal long, tapering, very slightly recurved ; aperture long, 

 narrow; columella slightly tortuous, inner lip encrusted by a very thin callus; sinus, small, deep, adjoining the 

 suture. Surface marked by numerous acute, revolving ribs, with concave interspaces and crossed by longitudinal ribs 

 following the direction of the lines of growth which, by their intersection, produce a semi-clathrate appearance. Near 

 the suture, over the space occupied by the sinus, the revolving ribs are replaced by fine lines. Length about an inch. 



This species is not unlike T. consoles in its sculpture ; but it difters in form. In 

 this, the spire is shorter than the body whorl ; in that, it is much longer ; in this, the 

 canal is straighter and the notch is nearer the suture than in that ; and, iinally, this 

 does not possess the heavy revolving rib just below the suture, which is one of the 

 most constant characters of co?2Sors. - 



T. (Surcula) humerosa. Gabb, n. s. 



Shell elongate fusiform, spire high, turriculated ; whorls ten, prominent and angulated on the sides, broadly and 

 deei^ly concave above. Suture bordered by a thickened line. Body whorl broad in the middle, concave above, con- 

 vexly narrowing below and suddenly constricted at the base, beyond which projects a long, slender, straight canal. 

 Surface marked by revolving ribs showing more or less tendency to alternation in size ; above the angle, these ribs 

 are smaller and more uniform. On the angle is a series of flattened tubercles, about a dozen to a volution. Aperture 

 wide and bi-angular above, narrowed in advance. Inner Hp but faintly encrusted. Sinus deep, oblique and placed 

 between the suture and the angle of the whorl. Length about an inch. 



A peculiar shell unlike any other Turris, in the formation. It looks like a small 

 Fusus. One specimen, on account of an injury during its growth, has the body 

 whorl rounded, instead of angulated on the shoulder. * 



T. (Bela) Dominicensis. Gabb, n. s. .. - . 



Shell minute, turriculated ; spire about twice as long as the mouth ; whorls eight, the first two nucleai', the 

 others angulated, straight and sloping above, convex below. Body whorl convex in the middle, concavely tapering 

 below. Suture linear, bordered by a slightly thickened line. Surface ornamented by small, revolving ribs, crossed 

 by minute but distinctly prominent lines of growth. On the angle is a series of tvibercles, about eight to a volution, 

 which sometimes extend above and below as broadly rounded ribs or undiilations. Aperture moderately broad, 

 regiUarly tapering in advance. Canal broad, short. Inner lip polished. Sinus very broad and shallow, the deepest 

 jjart immediately above the angle. Length .2 inch. ' . ■ ' 



T. (Drillia) gibbosa. Chemn., sp. " - 



Pleurotoma gibbosa, Chemn. Conch., Vol. XI. p. 190. , - - • 



BriUia gibbosa, H. and A. Ad. Gen. Rec. Moll. 



T. (Drillia) v e n u s t a. Sby., sp. 



Pleurotoma venusta, Sby. Quart. Jour. Vol. VI. p. 59, pi. 10, fig. 7, id. Guppy, Quart. Jour. Vol. XXII. p. 289. 

 T. (Drillia) squamosa. Gabb, n. s. 



Shell large, heavy, turriculated ; spire about H times the length of the mouth. Whorls ten, prominently convex 

 in the middle, concave or laterally flattened immediately below the suture. Suture bordered by a thickening of 

 the succeeding whorl. Surface covered by prominent oblique ribs, about ten to a volution. These ribs are laterally 

 flattened in the young shell, but develope to an elongated tubercle in the adult. The whole surface is transversely 

 striated by minute, broken, elevated, thread-like lines, which are in turn crossed or interrupted by the lines of 

 growth, which in places, especially adjoining the suture and on the large ribs, stand out as squamose plates. Mouth 



