288 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



Two specimens of this species (Cat. No. 127542, U.S.N.M.) come 

 from San Hipolito Point, Lower California. The type has ,10 post- 

 nuclear whorls and measures: Length, S mm.; diameter, 1.2 mm. 



The present species differs from Odostomia (Scalenostoma) dotella 

 DaU and Bartsch in being much larger, much more acicular, and in 

 being brown instead of translucent. 



ODOSTOMIA (HEIDA) KELSEYI, new species. 

 Plate 38, figs. 6, 6a. 



Shell small, ovate, bluish-white. Nuclear whorls small, obliquely 

 immersed in the first of the succeeding turns, above which only the 

 tilted edge of the last volution projects. Post-nuclear whorls mod- 

 erately rounded, narrowly shouldered at the summit, marked only by 

 moderately retractive lines of growth and numerous exceedmgly fine, 

 spiral striations. Sutures subchanneled. Periphery of the last whorl 

 somewhat inflated, well rounded. Base moderately long, sloping evenly 

 from the periphery to the anterior extremity, the area about the 

 umbilicus havmg a pinched-in effect, and is surrounded by a somewhat 

 tumid area. Aperture large, broadly oval, somewhat flaring at the 

 anterior lateral angle ; posterior angle acute ; outer lip thin ; inner lip 

 decidedly curved and slightly revolute; parietal waU covered with a 

 thick caUus which joms the caUus of the columella to the posterior 

 angle of the aperture, rendering the peritreme complete. No fold is 

 visible on the columella. Operculum horny, thin pauci-spiral, 

 concavo-convex, the convex side being the outer. 



Two specimens of this species were collected at San Diego, CaH- 

 fornia. One of these, the type (Cat. No. 211544, U.S.N.M.), has 5 

 post-nuclear whorls and measures: Length, 2.7 mm.; diameter, 1.5 

 mm. The other specimen is in IVIr. Kelsey's collection. 



EXPLANATION OF PLATES. 



Plate 35. 



Fig. 1. Turbonilla (Strioturbonilla) encella; type; 4.5 mm.; p. 265. 



The fine spiral striations have been omitted in this figure. 

 la. Nucleus of the same much enlarged. 



2. Turbonilla (Strioturbonilla) dracona; type; 6.9 mm.; p. 266. 



The fine spiral striations have been omitted in this figure. 

 2a. Nucleus of the same much enlarged. 



3. Turbonilla (Strioturbonilla) coolceana; type; 6.9 mm. ; p. 266. 



4. Turbonilla (Chemnitzia) clarinda; type; 4.7 mm.; p. 264. 

 4a. Nucleus of the same much enlarged. 



5. Turbonilla (Pyrgolampros) pesa; type; 6 mm.; p. 269. 



6. Turbonilla (Pyrgolampros) rinella; type; 8.5 mm.; p. 270. 



7. Turbonilla (Pyrgolampros) talma; type; 9 mm.; p. 267. 



8. Turbonilla (Strioturbonilla) dinora; type; 9.2 mm.; p. 264. 



The fine spiral striations have been omitted in this figure. 



9. Turbonilla (Pyrgolampros) gloriosa; type; 8.3 mm.; p. 268. 



10. Turbonilla (Strioturbonilla) bakeri; type; 8 mm.; p. 265. 



The fine spiral striations have been omitted in this figure. 

 10a. Nucleus of the same much enlarged. 



11. Turbonilla (Pyrgolampros) macouni; type; 9 mm.; p. 268. 



