% 



NO. 2193. WEST AMERICAN MARINE MOLLVSKS—BARTSCH. 663 



TURBONILLA (MORMULA) VISCAINOI. new species. 



Plate 43, fig. 3. 



Shell elongate-conic, yellowish-white. Nuclear whorls two, well 

 rounded, forming a moderately elevated helicoid spire, the axis of 

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

 of which the tilted edge is about one-third immersed. Postnuclear 

 whorls well rounded, almost appressed at the summit, crossed by 

 strong, low, well-rounded, distantly spaced, protractive axial ribs, of 

 which 14 occur upon the first and second, IG upon the third to sixth, 

 and 18 upon the remaining turns. In addition to the ribs the whorls 

 are marked at irregiilar intervals by rather strong varices. Inter- 

 costal spaces about three times as wide as the ribs, crossed by five 

 spiral pits, wiiich, if the second w^ere a little more anterior, would 

 divide the space between the summit and the fifth pit, which is at the 

 periphery, into five equal spaces. The spaces between these slender 

 pits are crossed by many very fine spiral striations, of which there 

 are about 13 between the summit and the first pit, 5 between the first 

 and second, 9 between the second and third, 11 between the third 

 and fourth, and 6 between the fourth and peripheral pit. Suture 

 moderately constricted. Periphery of the last whorl well rounded, 

 base short, well rounded, marked by the feeble continuations of the 

 axial ribs, which become evanescent before reaching the middle of 

 the base and many fine wavy spiral striations which agree with those 

 on the spire in strength and spacing. Aperture short, subquadrate, 

 posterior angle obtuse; outer lip thin, showing the external sculpture 

 w^ithin, reenforced within by four slender spiral lamellae, two of 

 which are anterior and two posterior to the periphery; inner lip 

 slightly flexuose, almost straight, and somewhat revolute; parietal 

 wall glazed with a very thin callus. 



The type Cat. No. 268734 U.S.N.M. was dredged by the U. S. 

 Bureau of Fisheries steamer Albatross at station 5678, off Redondo 

 Point, Magdalena Bay, Lower California, in 13^ fathoms on broken 

 shell bottom. The type has nine postnuclear whorls and measures — • 

 length, 4.3 mm. ; diameter, 1.2 mm, 



ODOSTOMIA (CHRYSALLIDA) TARAVALI, new species. 



Plate 46, fig. 3. 



Shell elongate-conic, semitransparent, bluish white. Nuclear 

 whorls, at least 2, well rounded, forming a planorboid 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 half obliquely immersed. 

 Postnuclear whorls flattened, narrowly, tabulatedly shouldered at the 

 summit, marked by strong, w-ell-rounded, retractive axial riba, of 



