ART. 18 SMALL SHELLS DREDGED BY ' ' ALBATROSS DALL 83 



thirds of its length to the base, provided with a weak fold at its 

 insertion. 



The type, Cat. No. 108061, 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 7.5 whorls and 

 measures: Length, 4.9 mm.; diameter, 1.5 mm. 



Subgenus Pyrgiscus Philippi 



TURBONILLA (PYRGISCUS) CONOMA, new species 



Shell large, very broadly elongate-conic, cream yellow. Nuclear 

 whorls two and a half, forming a depressed helicoid spire, the axis of 

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

 of which is about one-fifth immersed. First postnuclear whorls 

 strongly rounded, inflated, smooth, the rest almost flattened, narrowly 

 shouldered at the summit and crossed by stout, slightly pro tractively 

 slanting axial ribs, of which 20 occur upon the second, 18 upon 

 the third, 20 upon the fourth, 24 upon the fifth and sixth, and 26 

 upon the last whorl. These ribs are very broad and low and about 

 twice as wide as the spaces that separate them. The intercostal 

 spaces are marked by 13 subequally spaced incised spiral lines, of 

 which the peripheral one is the strongest. In addition to this the en- 

 tire surface is marked by numerous fine lines of growth and spiral 

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

 well rounded, marked by about 16 incised, fine, irregularly spaced, 

 wavy spiral striations. Aperture large, subquadrate; posterior angle 

 obtuse; outer lip fractured; inner lip almost straight, stout, provided 

 with an obsolete fold a little anterior to its insertion. 



The type, Cat. No. 108049, 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 7.5 postnu- 

 clear whorls and measures: Length, 5.5 mm.; diameter, 2.1 mm. 



Cat. No. 360178, U.S.N.M., contains an additional specimen from 

 the type locality. 



TURBONILLA (PYRGISCUS) MIONA, new species 



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

 depressed helicoid spire the axis of which is at right angles to that of the 

 succeeding turns, in the first of which the nuclear spire is about one- 

 fourth immersed. Postnuclear whorls well rounded, appressed at the 

 summit, the first almost smooth, the rest marked by strong, slightly 

 protractively slanting, low, rounded axial ribs, of which 20 occur upon 

 the second and third, 18 upon the remaining turns. Intercostal 

 spaces a little narrower than the ribs, crossed by eight incised spiral 

 lines of which the posterior four are grouped in pairs. Suture moder- 

 ately constricted. Periphery of the last whorl well rounded. Base 



