156 PROCEEDINGS OF THE ACADEMY OF [1899. 



Turbonilla Stimpsoni, new species. Plate VIII, fig. 7. 



Shell j^iire white, slender, with elongated whorls, causing the apex 

 to appear very pointed. Whorls flattened, 9, besides the elongated, 

 smooth, shining, prominent, slightly oblique, flattened nucleus. 

 Suture deep, forming distinct notches in the otherwise straight 

 outlines of the spire, scalloped by the ends of the numerous ribs. 

 These are about 36, narrow, rounded, very oblique (inclined to 

 right), separated by much narrower, rather deep spaces which are 

 crossed by nearly equal, but irregularly spaced, incised lines which 

 form deep pittings. Under a half-inch pocket lens 9 can be 

 counted which increase to 10 or 11 under the microscope, and are 

 seen to cut into the sides of the ribs. On the base the ribs merge 

 into prominent lines of growth which are cut by four widely 

 separated, conspicuous, revolving lines, with a few very fine ones 

 below. Base well-rounded. Aperture elongate-ovate, with the 

 pillar-lip curved and moderately thickened. 



Length, 5f mm. ; diameter, 1 mm. ; length of aperture, 1 mm. 



One specimen (No. 72,042) in the R. Swift collection was found 

 by William Stimpson on the Carolina coast, and was labelled as T. 

 interrupta (Totten). It is very unlike all the known northern 

 forms. The T. ornata d'Orbigny, 1853, not Gould, 1861, has 

 ribs which extend over the base, but according to d'Orbigny' s 

 figure, they are coarser, fewer in number and perpendicular; the 

 whorls are more convex, the spire less acute and the spirals more 

 numerous (Hist. Vile de Cuba, i, p. 221, atlas, Pi. XVI, figs. 

 18-20). 

 Turbonilla incisa, new species. Plate VIII, fig. 12. 



Shell of medium size, moderately stout, white, semitransparent 

 and lustrous, when fresh, with coarse, spiral, incised lines in the 

 intercostal spaces and on the base. Suture well marked. Whorls 

 flattened, 9 below the rather prominent, slightly oblique, flattened 

 nucleus. Transverse ribs 20, broad, bluntly rounded, straight, 

 perpendicular, with wider, shallow interspaces crossed by 7, rarely 

 6, coarse, unequal, incised, spiral lines or grooves, about evenly 

 separated. In one example having 6 lines, the last, just above 

 the suture, is very much broader and deeper than the others. 

 Base well-rounded, cut by about 7, evenly spaced, incised, spiral 

 lines. Aperture somewhat elongated; pillar-lip straight, thin, 

 slightly reflected. 



