OF SANTO DOMINGO. 



209 



sub-quad rate ; canal short, twisted ; inner lip covered with a heavy plate, of which the free edge pi'ojects somewhat; 

 outer lip heavy, margin acute ; sinus large, deep, and adjoining the suture. Length 2.5 inches, width 1 inch. 



CLAVATULA. Lam. / , 



C. lab lata. Gabb, n. s. 



Shell regularly fusiform, spire nearly as long as the aperture; whorls nine, angulated above, concave and sloping 

 from the angle to the suture, bearing about nine or ten broad rounded oblique tubercles on the outer side of the 

 angle. Surface of the upper whorl faintly striate by revolving lines ; body whorl marked only by the coronal tubercles 

 and lines of growth in some specimens ; in others faintly striate like the spire. Aperture narrow, canal moderately 

 produced, very faintly twisted ; inner lip simple; outer lip irregularly rugose internally, prominent in th^ middle, 

 acute on the margin, and thickened behind ; sinus deep, adjoining the body whoil, margin internally thickened. 

 Length .85 inch, width .4 inch. 



DEFRANCIA. Millet. 



D. gracilis. Gabb, n. s. 



Shell elongate slender-fusiform ; spire longer than the mouth, whorls eleven, of which three are nuclear, 

 slightly rounded on the sides ; suture bordered by a thickened line. Surface marked by numerous rounded longi- 

 tudinal ribs extending to the suture and crossed by two sets of revolving lines, one series prominent and somewhat 

 distantly placed, the interspaces filled with minute threads. This revolving sculpture varies somewhat in degree. 

 Aperture narrow ; canal moderate, broad ; columella encrusted, slightly tortuous, a broad low tooth near the sinus ; 

 outer lip very thick, with an acuie slightly rctiexed margin and a faint notch anteriorly ; posterior sinus deep, close 

 to the suture. Length L3 inch, width .3 inch. 



A rare shell, remai'kable for its long slender form. 



D. fusiform is. Gabb, n. s. 



Shell elongate, fusiform, spire a little longer than the mouth ; whorls twelve, the first one or one and a half 

 nuclear, the others convex in the middle and strongly carinated ; suture bordered by a thickened rib. Surface 

 ornamented by a few large longitudinal ribs (about eight), crossed by prominent revolving ribs with broad inter- 

 spaces in which arc fine revolving lines. There are usually three of these larger revolving ribs on the upper whorl, 

 the upper one of which is generally accompanied by a smaller one placed above and close to it. Mouth toroad above, 

 narrowed and produced in a long canal, the end of which is slightly expanded. Inner lip heavily encrusted ; outer 

 lip very thick with a thin margin, internally grooved, the grooves corresponding to the external revolving lines. 

 Sinus deep, widened a little at the bottom, placed above the angle. Length L5 inch, width .5. 



A shell resembUngi^^«S(is in external form and with the large ribs of T. Jaquensis 

 combined with nearly the same revolving ornaments as D. gracilis. Its spii'e is pro- 

 portionally much higher than T. Jaquensis, and its whole form is unlike the other 

 species. 



D. p a u p e r c u 1 a. Gabb, n. s. 



Shell small, compact, elongate ; sides curved ; spire one and a half times the length of the mouth ; suture well 

 marked and bordered by a raised line ; whorls about seven ; sides gently curved, forming a nearly coniinuous line 

 from the apex to the anterior end. Surface prominently clathrate. Aperture narrow, canal short and broad ; 

 columella arched ; outer lip thickened, sinus moderate, near the suture. Length .35 inch, width .1 inch. 



Ver}^ rare. A single specimen found. Distinguished by its small size, its curved 

 sides, and its strongly cancellate sculpture. 



GLYPHOSTOMA. Gabb, n. Gen. 

 Shell like Befranciu, but with the entire length of the inner lip strongly crenulatcd or transverselj' rugose. 



This genus bears the same relation to .Defrancia that MetuleUa {'id s/'ju-n) bears 



