82 



BULLETIN G8, UNITED STATES NATI0N.4L MUSEUM. 



and deeply incised spiral lines. Aperture })ear shaped; posterior 

 angle acute; outer lip rather thick; columella short, oblique and 

 somewhat re volute. 



The type (Cat. no. 206866, U.S.N.M.) was dredged in 10 fathoms, 

 off San Pedro, California. It has nine post-nuclear whorls and 

 measures: Length 7.5 mm., diameter 2.3 mm. 



TURBONILLA (PYRGISCUS) JEWETTI, new species. 



Plate 7, figs. 2, 2a. 



Shell short, robust, rose pink, wax yellow at tip. Nuclear whorls 

 two and one-half, very small, low, helicoid, having their axis at right 

 angles to that of the succeeding turns, in the first of which they are 

 about one- third immersed. Post-nuclear whorls flattened, shoul- 

 dered at the summit, marked by strong, rounded, slightly protract- 

 ive axial ribs; of which 18 occur upon the second, 20 upon the third, 

 22 upon the fourth and fifth, 24 upon the sixth, and 26 upon the 

 penultimate turn. Intercostal spaces about equal to the ribs, 

 strongly impressed, marked by five series of equal and equally 

 spaced spiral pits, the first of which is at the periphery, the last a 

 little farther from the summit than its neighbor. Sutures strongly 

 marked, rendered sinuous by the ribs. Periphery of the last whorl 

 rounded, marked by the feeble continuations of the axial ribs. Base 

 moderately long, well rounded, marked by eight unequal and 

 unequally spaced spiral striations, the two immediately below the 

 periphery being stronger than the rest and somewhat interrupted. 

 Aperture oval; outer lip thick within, columella stout, somewhat 

 twisted and slightly re volute. 



The type (Cat. no. 153048, U.S.N.M.) and another specimen were 

 obtained at low tide at San Diego, California. The type has eight 

 post-nuclear whorls and measures : Length 5.5 mm., diameter 1.9 mm. 



Named for the late Col. Ezekiel Jewett. 



We have examined the following specimens: 



