NO. 1903. WEST AMERICAN PYRAMIDELTJD MOLLUSKS—BARTSClf. 271 



which 20 occur upon the second, 18 upon the third to sixth, 20 upon 

 the seventh, 26 upon the eighth to tenth, and 30 upon the penulti- 

 mate whorl; upon the last 5 whorls they are less regular in size and 

 spacing than on the preceding. Intercostal spaces about twice as 

 wide as the ribs on the first 7 whorls, averaging a little less in width 

 upon the remaining; the intercostal spaces are strongly impressed, 

 and marked with 6 strongly impressed series of spirally spaced pits, 

 the fii'st one below the summit being a little farther from the summit 

 than from its neighbor; between these spiral pits occur finer incised 

 lines, of which there are 10 between the summit and the first strong 

 pit, 1 each between the first and second, and second and third, 2 

 between the third and fourth, 3 between the fourth and fifth, and 

 2 between the fifth and sixth; the strong incised fines pass up on the 

 sides of the ribs, constricting the ribs where they meet them; the 

 fine lines arc not a])parent upon the ribs. Sutures strongly con- 

 stricted. Periphery of the last whorl well rounded. Base sliort, 

 well rounded, marked by about 20 very slender incised spiral lines. 

 Aperture oval; posterior angle obtuse; outer lip thin, showing the 

 external sculpture within; inner lip slightly curved, oblique, reflected, 

 but not adnate to the base; parietal wall covered with a thin callus. 



The type (Cat. No. 229011, U.S.N.M.) was collected by Mr. C. W. 

 Gripp, ofl' San Diego, California, and measures: Length, 11 mm.; 

 diameter, 2.7 mm. 



This species follows Turhonilla (Pyrgiscus) castanella in the key. 



TURBONILLA (PYRGISCUS) CALLIMENE, new species. 



Plate 36, fig. 7. 



Shell moderately large, elongate-conic, flesh colored. Nuclear 

 whorls decollated. Post-nuclear whorls rather high between the 

 sutures, moderately shouldered at the summit, marked by nujiierous, 

 well-developed, almost vertical, axial ribs, of which 18 occur upon 

 the second and third, 20 upon the fourth, 24 upon the fifth, 28 upon 

 the sixth, 30 upon the seventh, and 34 upon the penultimate turn. 

 Intercostal spaces strongly impressed, about as wide as the ribs. 

 In addition to the axial sculpture, the whorls are crossed by five 

 strong lines of pits, which are distributed over the anterior two- 

 thirds between the sutures, the intercostal spaces on the posterior 

 third being smooth. The anterior three of these five lines of pits 

 are of equal strength and equally spaced; the posterior two are weaker 

 and a little closer together than the rest, the second one being a httie 

 farther distant from the median than that is from its neighbor anterior 

 to it. Periphery and the somewhat attenuated base of the last whorl 

 well rounded, marked by the feeble continuations of the axial ribs 

 and by nine incised, spiral lines, wliich vary considerably in strength 

 and spacing. The first two of these, below the five already described, 

 are of about the same strength as those immediately above the suture; 



