82 PROCEEDINGS OF THE NATIONAL MUSEUM vol.70 



Cat. No. 360176, U.S.N.M., contains a young specimen from the 

 type locality, from which we have described the nuclear characters. 



TURBONILLA (STRIOTURBONILLA) IDOTHEA, new species 



Shell small, broadly elongate-conic, white. Nuclear whorls decol- 

 lated. Postnuciear whoris well rounded, very narrowly shouldered 

 at the summit, marked with strong, slightly protractively slanting 

 axial ribs, of which 16 occur upon aU but the last turn, which has 

 18. Intercostal spaces about one and a half times as wide as the 

 ribs, crossed by two incised spiral lines which are stronger than the 

 rest. One of these is at the periphery and the other about two-fifths 

 between the summit and the periphery anterior to the summit. The 

 space between these two incised lines is crossed by 20 equal and 

 equally spaced spiral striations, and the space between the anterior 

 incised line and the summit by 9. Suture moderately constricted. 

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

 rounded, marked by the feeble continuations of the axial ribs, which 

 evanesce before reaching the middle of the base, and numerous closely 

 spaced wavy spiral striations. Aperture moderately large, subquad- 

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

 reflected and appressed to the base for the posterior third of its 

 length, provided with a feeble fold a little anterior to its insertion. 



The type, Cat. No. 360177, 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 six whorls remain- 

 ing, having lost the nucleus and a fraction of the first postnuclear 

 whorl, and measures: Length, 3 mm.; diameter, 1 mm. 



TURBONILLA (STRIOTURBONILLA) NONICA, new species 



Shell elongate-conic, milk 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 succeeding turns, in the first of which the nuclear 

 spire is about one-fourth immersed. Postnuclear whorls tabulately 

 shouldered, well rounded, somewhat constricted at the suture, marked 

 by moderately strong, somewhat curved, retractively slanting axial 

 ribs which are poorly developed on the first whorl, and of which 20 

 occur upon the second, 22 upon the fourth, 24 upon the fifth, 26 upon 

 the sixth, and 30 upon the last turn. Intercostal spaces about as 

 wide as the ribs, crossed by 34 fine spiral striations which are about 

 equal, except those at the summit, which are finer and more closely 

 spaced. Suture strongly constricted. Periphery of the last whorl 

 inflated. Base short, inflated, marked by the continuations of the 

 axial ribs, which extend to the umbilical chink, and spiral sculpture 

 similar to that of the spire. Aperture oval; posterior angle acute; 

 outer lip thin; inner lip short, reflected over and appressed for two- 



