266 PROCEEDINOS OF THE NATIONAL MUSEUM. vol.42. 



before reaching the suture, thus leaving a narrow plain band immedi- 

 ately above the suture. Sutures well impressed. Periphery of the last 

 whorl and short base well rounded, smooth, except for fine incre- 

 mental lines and the numerous, exceedingly fine, closely-spaced, 

 wavy, spiral striations which cover the entire surface of the shell. 

 Aperture subquadrate ; posterior angle obtuse ; outer Hp thin, showing 

 the external sculpture within; inner lip almost straight, slightly 

 revolute; parietal wall glazed with a thin callus. 



The type (Cat. No. 211549, U.S.N.M.) has 13 post-nuclear whorls 

 and measures: Length, 8 mm.; diameter, 1.8 mm. It and another 

 specimen, wliich is in Dr. F. C. Baker's collection, came from San 

 Diego Bay, California. 



This species follows TurboniUa (Strioturhonilla) nicliolsi in the key. 



TURBONILLA (STRIOTURBONILLA) DRACONA, new species. 



Plate 35, figs. 2, 2a. 



Shell very elongate-conic, bluish- wliite. Nuclear whorls small, 2, 

 helicoid, having their axes at right angles to that of the succeeding 

 turns. Post-nuclear whorls well rounded, somewhat shouldered at 

 the summit, marked by strong, somewhat curved, decidedly protrac- 

 tive, axial ribs, wliich extend undiminished from the summit to the 

 periphery, between the sutures, while on the last whorl they continue 

 feebly over the base. Of these ribs, 14 occur upon the first, 16 upon 

 the second, 18 upon the third to eighth, 20 upon the ninth and tenth, 

 and 22 upon the penultimate turn. Intercostal spaces about IJ 

 times as wide as the axial ribs, deep. Sutures deeply impressed, 

 rendered sinuous by the summits of the ribs. Periphery and the short 

 base of the last whorl well rounded, marked by the feeble continua- 

 tions of the axial ribs and numerous, exceedingly fine, closely spaced, 

 spiral striations; the latter may also be seen on the spire. Aperture 

 moderateh' large, subquadrate; posterior angle obtuse; outer lip thin, 

 showing the external sculpture within, inner lip moderately long, 

 almost straight, provided with a very feeble fold at its insertion. 



The type (Cat. No. 211548, U.S.N.M.) was collected by Mr. Kelsey 

 at San Diego, California. It has 12 post-nuclear whorls and measures: 

 Length, 6.9 mm.; diameter, 1.5 mm. 



Tliis species follows TurboniUa (Strioturhonilla) serrse in the key. 



TURBONILLA (STRIOTURBONILLA) COOKEANA, new species. 

 Plate 35, fig. 3. 



SheU elongate-conic, yellowish-white, with a darker yellow band a 

 little posterior to the middle between the sutures. (Nuclear whorls 

 decollated.) Post-nuclear whorls moderately rounded, somewhat 

 exserted near the summit; marked by moderately strong rounded, 

 slightly pro tractive axial ribs, of which 18 occur upon the second to 

 fourth, 20 upon the fifth and sixth, 24 upon the seventh and eighth, 



