78 PROCEEDINGS OF THE NATIONAL MUSEUM vol. Ti. 



by rather strong, almost vertical axial ribs, of which 16 occur upon 

 the first and second and 14 upon the remaining whorls. These axial 

 ribs expand slightl.y near the summit, where they become enfeebled 

 and are separated by spaces about one and a half times as wide as 

 the ribs. Suture moderately constricted. Periphery of the last whorl 

 rounded. Base very short, strongly rounded. Entire surface marked 

 by closely spaced, fine spiral striations, which are best shown in the 

 intercostal spaces. Aperture fractured anteriorly; posterior angle 

 obtuse; inner lip provided with an obsolete fold near its insertion. 



The type, Cat. No. 108052, 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 nine postnuclear 

 whorls and measures: Length, 3.3 mm.; diameter, 0.7 mm. 



TURBONILLA (STRIOTURBONILLA) THEONA, new species. 



Shell elongate-conic, bluish white, semi-translucent. Nuclear 

 whorls two and a half, forming a rather large helicoid spire, the axis 

 of which is almost at right angles to that of the succeeding turns, in 

 the first of which the nuclear spire is about one-fifth immersed. Post- 

 nuclear whorls moderately rounded, almost appressed at the summit, 

 marked by low, rounded, almost vertical ribs, of which 20 occur upon 

 the first to sixth, 22 upon the seventh and the last whorl. Inter- 

 costal spaces but feebly depressed. Suture moderately constricted. 

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

 rounded, smooth. The entire surface of the shell is marked by fine 

 lines of growth and very fine microscopic spiral striations. Aperture 

 subquadrate; posterior angle obtuse; outer lip thin, showing the 

 external markings within by transmitted light; inner lip almost 

 straight, reflected over and appressed to the base for about a third of 

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



The type. Cat. No. 108059, 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 nine postnuclear 

 whorls and measures: Length, 4.6 mm.; diameter, 1.1 mm. 



Cat. No. 108063, U.S.N.M., contains about 50 additional specimens 

 from the type locality. 



TUUBONU.LA (.STRIOTURBONILLA) ELECTRA, new species 



Shell rather large, elongate-conic, bluish white, semitranslucent. 

 Nuclear whorls two and a half, forming a depressed helicoid spire, the 

 axis of which is almost at right angles to that of the succeeding turns, 

 in the first of which the nuclear spire is about one-fourth immersed. 

 Postnuclear whorls moderately well rounded, narrowly shouldered at 

 the summit, marked with slightly protractively slanting axial ribs, 

 which are but feebly developed. On the first turn they are merely 



