NO. 1903. WEST AMERICAN PYRAMIDELUD MOLLUSKS—BARTSCH. 265 



fornia. It has 12 post-nuclear whorls and measures: Length, 9.2 

 mm.; diameter, 2.2 mm. 



This species is nearest related to the Turbonilla (Strioturhonilla) 

 steamsi, a fossil species from San Diego, California, and follows Tur- 

 bonilla iStrioturhoniUa) stephanogyra in the key. 



TURBONILLA (STRIOTURBONILLA) ENCELLA, new species. 



Plate 35, fig. 1, la. 



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

 lated. Post-nuclear whorls well rounded, slightly shouldered at the 

 summit, crossed b}'^ broad, low, decidedly protractive, axial ribs, 

 which become slightly flattened at the surmnit. Of these ribs, 14 

 occur upon the second of the remaining turns, 16 upon the third to 

 seventh, and 20 upon the penultimate turn. Intercostal spaces a 

 little wider than the ribs, the impressed portion terminating at a 

 little distance posterior to the suture, leaving a narrow, plain band just 

 above this. Suture well marked. Periphery of the last whorl and 

 the moderately long base well rounded, the latter marked by the feeble 

 continuations of the axial ribs, which extend to the umbilical area. 

 Entire surface of spire and base marked by numerous, strong, rather 

 coarse, wavy, spiral striations, which on the spire extend equally 

 strong over the ribs and intercostal spaces. Aperture subciuadrate; 

 posterior angle obtuse; outer lip (fractured) thin; inner lip. moder- 

 ately strong, somewhat curved, and reflected. 



The unique type of this species (Cat. No. 211547, U.S.N.M.) comes 

 from San Pedro, California. It has 9 post-nuclear whorls remaining, 

 having lost the nucleus and probably the first 2 post-nuclear turns, 

 and measures: Length, 4.5 mm.; diameter, 1.2 mm. 



This species recalls Turbonilla (Strioturbonilla) steamsi, which 

 occurs fossil at San Pedro. It differs from it in being much smaller 

 and in having much stronger spiral sculpture. It follows Turbonilla 

 (Strioturbonilla) attrita in the key. 



TURBONILLA (STRIOTURBONILLA) BAKERI, new species. 

 Plate 35, figs. 10, lOo. 



Shell elongate-conic, bluish-white. Nuclear whorls small, 2h, form- 

 ing a quite elevated, helicoid spire, whose axis is at right angles to 

 that of the succeeding turns, in the first of wliich it is about one-fifth 

 immersed. Post-nuclear whorls slightly rounded, narrowly shoul- 

 dered at the summit, somewhat constricted at the suture, marked by 

 very regular, strong, rounded, slightly protractive, axial ribs, which 

 become somewhat expanded at the summit. Of these ribs, 14 occur 

 upon the first four turns, 16 upon the fifth to tenth, 18 upon the 

 eleventh, and 20 upon the penultimate turn. Intercostal spaces 

 strongly impressed, almost as wide as the ribs, terminating shortly 



