118 



BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



angle acute; outer lip thin, showing the external sculpture within; 

 provided with five strong, spiral cords, the anterior one of which is 

 a little closer to its neighbor than the rest,which are equally spaced; 

 columella moderately strong, curved, and revolute. 



The type and 35 specimens (Cat. no. 46501, U.S.N.M.) were col- 

 lected at San Diego, California. The type has ten post-nuclear 

 whorls and measures: Length 8.5 mm., diameter 2.3 mm. 



The following specimens have been examined: 



TURBONILLA (MORMULA) HETEROLOPHA, new species. 

 Plate 11, fig. 9. 



Shell small, slender, chestnut-brown, with wax yellow apex. 

 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 one-fourth immersed. Post-nuclear whorls flat, 

 appressed at the summit, not constricted at the periphery, forming a 

 spire of almost straight, uninterrupted outline. Axial sculpture con- 

 sists of very broad, low, rounded, slightly retractive axial ribs, which 

 are absent on the first turn but of which 20 occur upon the second to 

 fourth, 28 upon the fifth and penultimate turn. Intercostal spaces 

 very narrow, marked by six spiral lines of pits. Sutures poorly de- 

 fined. Periphery and base of the last whorl well rounded, marked by 

 the feeble continuations of the axial ribs and seven equally spaced, 

 incised spiral lines. Aperture oval; posterior angle acute; outer lip 

 thin, showing the external markings within ; reenf orced on the inside 

 by four or five slender, equally spaced, spiral cords; columella strong, 

 somewhat twisted. 



The type and three specimens (Cat. no. 153065, U.S.N.M.) come 

 from San Diego, California. The type has lost the nucleus; the seven 

 post-nuclear whorls measure: Length 5.5 mm., diameter 1.8 mm. 

 Cat. no. 162690, U.S.N.M., contains four specimens from San Hipo- 

 lito Point, Lower California; collected by Mr. Henry Hemphill in 

 whose collection there are five more from the same locality. Cat. 

 no. 206886, U.S.N.M., one from San Diego, dredged in 12 fathoms. 



