1899.] NATURAL SCIENCES OF PHILADELPHIA. 169 



badly broken, differs so decidedly from the other species in the 

 abrupt taper of its spire, flattened whorls and numerous, nearly 

 straight ribs, as to seem worthy of description. 



It is small, opaque white, with considerable lustre, with upper 

 portion much more abruptly tapered than the lower. The 8 whorls 

 flattened, the only curvature being just above the suture Avhich is 

 so deep and straight that each whorl extends out abruptly beyond 

 the preceding one. Transverse ribs irregularly developed due to an 

 injury, about 30 narrow, perpendicular, straight on the upper 

 whorls, becoming slightly curved above, on the lower whorls, sep- 

 arated by wider, moderately deep spaces, which end at the periph- 

 ery of the Avell-rounded body-whorl in clean-cut, rounded ends. 

 Base elongate, well-rounded. Inner-lip straight, thickened. 



Length, 3| mm. ; diameter, about 1 mm. 

 Turbonilla Dalli, new species. Plate VIII, fig. 8. 



This is a large, stout, regularly coiled, very beautiful species, 

 bluish white, semitransparent, with dull lustre. Suture unusually 

 deep, but not channeled. Whoids very convex, 12 below the 

 prominent nucleus of 2 projecting whorls transverse to the axis. 

 Transverse ribs 16, often opaque wliite, very prominent, slightly 

 oblique, separated by very deep, concave, about equally wide 

 spaces, Avhich terminate in clean, square-cut ends, sometimes just 

 above the suture. Base short, moderately convex, smooth. Aper- 

 ture squarish; the outer-lip thin, greatly expanded, turning in 

 abruptly to meet the straight, much thickened, not reflected, 

 pillar-lip in a rounded angle. The entire surface covered with 

 exceedingly fine microscopic stria?. 



Length of largest specimen (apex gone), 8| mm. ; diameter, 

 2i mm.; length of aperture, 1^ mm. 



Three live specimens (No. 72,049) were found at Sarasota Bay, 

 Fla., by Mr. H. Hemphill. A single, large, imperfect specimen 

 (No. 94,804, U. S. N. M.), from Cape Hatteras, N. C, loaned 

 me by Dr. Dall, agrees perfectly with these specimens. 



A poor worn specimen (No. 10,310, Peabody Museum ), from 

 Egraont Keys, Fla. 

 Turbonilla HempMUi, new species. Plate VIII, fig. 3. 



This species is closely related to the preceding, but is more 

 slender, longer, Avith more pointed apex, smaller nucleus, less con- 

 vex whorls, more numerous ribs and more elongated aperture. 



