76 PROCEEDINGS OF THE NATIONAL MUSEUM vol.70 



The type, Cat. No. 108366, U.S.N. M., comes from United States 

 Bureau of Fisheries Station 2415, 440 fathoms, sandy bottom, 45.6° 

 bottom temperature, off Georgia. The type has 6.1 postnuclear 

 whorls and measures: Length, 5.2 mm.; diameter, 2.2 mm. 



Cat. No. 107992, U.S.N.M., contains another specimen from United 

 States Bureau of Fisheries Station 2668 in 294 fathoms, sandy bottom, 

 46.3° bottom temperature, off Fernandina, Fhi. 



Genus TURBONILLA Risso 



Subgenus Ptycheulimella Sacco 



TURBONILLA (PTYCHEULIMELLA) HESPERA, new species 



Shell elongate-conic, bluish white. Nuclear whorls two and a half 

 forming a depressed helicoid spire, the axis of which is almost at 

 right angles to that of the suceeding turns, in the first of which the 

 nuclear spire is about one-fourth immersed. The edge of the nuclear 

 spire extends slightly beyond the outline of the postnuclear spire on 

 the left side. Postnuclear whorls rather high between summit and 

 suture, very narrowly shouldered at the summit, the early ones marked 

 by feebly developed, protractively slanting axial ribs, which are 

 broader than the spaces that separate them. They are too ill defined 

 to permit of proper counting. In addition to the obsolete ribs the 

 spire is marked by fine lines of growth and very closely spaced micro- 

 scopic spiral striations. Periphery of the last whorls strongly rounded . 

 Base very short, inflated, strongly rounded. Aperture broadly oval; 

 posterior angle obtuse; outer lip thin; inner lip almost straight, 

 slender, slightly reflected and appressed to the base for the posterior 

 half of its length, provided with an obsolete fold near its insertion. 



The type. Cat. No. 360181, U.S.N.M., comes from United States 

 Bureau of Fisheries Station 2668 in 294 fathoms, sandy bottom, 

 46.3° bottom temperature off Fernandina, Fla. It has 10 postnuclear 

 whorls and measures: Length 5.3 mm.; diameter, 1.2 mm. 



Cat. No. 360169, U.S.N.M., contains another specimen from the 

 type locality. 



TURBONILLA (PTYCHEULIMELLA) MELEA, new species 



Shell small, slender, elongate-conic, milk white. Nuclear whorls 

 two and a half, forming a depressed helicoid spire having its axis at 

 right angles to that of the succeeding turns, in the first of which the 

 nuclear spire is about one-third immersed. Postnuclear whorls flat- 

 tened, very narrowly shouldered at the summit, marked by somewhat 

 irregularly developed and spaced obsolete axial ribs, which are so ill 

 defined that they do not permit of counting, and fine lines of growth 

 and closely spaced microscopic striations only. SutiiYe moderately 

 constricted. Periphery of the last whorl well rounded. Base short, 

 well rounded, marked by the fine spiral sculpture only. Aperture 



