WEST AMERICAN PYRAMIDELLID MOLLUSKS. 113 



TURBONILLA (MORMULA) CATALINENSIS, new species. 

 Plate 11, figs. 10, 10a. 



Shell elongate-conic, very slender. Nuclear whorls two and one- 

 half, forming a depressed, helicoid spire, whose axis is at right angles 

 to that of the succeeding turns, in the first of which it is about one- 

 fourth immersed. Post-nuclear whorls well rounded, with appressed 

 summits, moderately constricted at the sutures, marked at irregular 

 intervals by strong varices; axial ribs somewhat sinuous, low, well 

 rounded, weakening toward the summit; 16 upon the first, 18 upon 

 the second to eighth, 24 upon the ninth and tenth, 26 upon the 

 eleventh and twelfth, 28 upon the thirteenth and penultimate turn. 

 Intercostal spaces as wide as the ribs, marked by nine equally spaced 

 spiral lines, which pass up on the sides of the ribs, but do not cross 

 their summits; space between the incised spiral lines is marked by 

 exceedingly fine spiral striations. Periphery of last whorl well 

 rounded. Base short, well rounded, marked by the feeble con- 

 tinuations of the axial ribs, and seven well incised spiral striations. 

 Aperture rhomboidal; posterior angle obtuse; outer lip thin, showing 

 the external markings within; as well as four color bands, one of 

 which is at the periphery, another midway between the periphery 

 and summit, the third at the summit, the fourth on the middle of 

 the base; in addition to these bands there are four strong spiral 

 folds, two on the base and two on the lip, which show deeply within 

 the aperture; columella slender, somewhat twisted and slightly 

 revolute. 



The type and another specimen (Cat. no. 160147, U.S.N.M.) were 

 dredged off Catalina Island. The type has 16 post-nuclear whorls 

 and measures: Length 16.5 mm., diameter 4 mm. Two specimens 

 were dredged b}" the University of California, at station 21 (3) off 

 Catalina Island, California. 



TURBONILLA (MORMULA) ESCHSCHOLTZI Dall and Bartsch. 



Plate 11, fig. 8. 



Turbonilla (Morinula) eschscholtzi Dall and Bartsch, Proc. U. S. Nat. Mus., 

 vol. 33, 1907, p. 513, pi. 45, fig. 10. 



Shell large, elongate-conic, brown, having three obscure bands of 

 dark brown, one of which is at the summit, another at the periphery, 

 while the third is halfway between these on the exposed portion of 

 the whorl of the spire. Nuclear whorls decollated. Post-nuclear 

 turns moderately rounded, ornamented by low, rounded, rather dis- 

 tantly spaced, slightly protractive axial ribs which become weakened 

 and somewhat flattened as they approach the appressed summit, and 

 many fine lines of growth both on the ribs and in the intercostal 



