62 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



The above is Doctor Carpenter's orio;inal description. An exami- 

 nation of the two speciments in the British Museum sheds little addi- 

 tional light. The fragment is a thick, stumpy shell too poor to be 

 determined. The small individual is of a light-brown color, showing 

 irregular axial ril)s and smooth intercostal spaces. 



TURBONILLA iPYRGOLAMPROS) RIDGWAYI, new species. 

 Plate 6, fisjs. 10, 10«. 



Shell robust, brown. Nuclear whorls two and one-half, moderately 

 large, forming a depressed helicoid spire, the axis of which is almost 

 at right angles to that of the succeeding turns, in the first of which 

 they are about one-fourth immersed. Post-nuclear whorls flattened 

 in the middle, rounded at the moderately strong shoulder at the 

 summit, and at the periphery; marked by strong, well elevated, 

 rounded, almost vertical axial ribs, which are slightly contracted in 

 the middle and somewhat sinuous. Of these ribs, 18 occur upon 

 the third to sixth and 20 upon the penultimate whorl. Intercostal 

 spaces well impressed, decidedly so in the middle, a little wider than 

 the ribs. Sutures strongly marked, rendered sinuous by the ribs at 

 the summits of the whorls. Periphery of the last whorl well rounded. 

 Base moderately long, well rounded, marked by the feeble continua- 

 tions of the axial ribs. Entire surface of base and spire marked 

 by closely crowded, wavy, well-incised spiral striations. Aperture 

 moderately large, oval; posterior angle acute; outer lip thin, show- 

 ing the external sculpture within; columella moderately strong, 

 somewhat curved and revolute, provided with a weak oblique fold 

 at its insertion. 



The type (Cat. no. 162560, U.S.N.M.) comes from San Diego, 

 California. It has seven post-nuclear whorls and measures: Length 

 4.6 mm., diameter 2 mm. 



Named for Robert Ridgway of the U. S. National Museum. 



TURBONILLA (PYRGOLAMPROS) VALDEZI Dall and Bartsch. 



Plate 6, fig.8. 



Turbonilla (Pyrgolampros) gibbosa Dall and Bartsch, Mem. Cal. Acad. Sci., 

 vol. 3, 1903, pp. 27-9, pi. 1, figs. 2, 2a, ncjt Chemnitzia gibbosa Gajifenter, Cat. 

 Maz. Shells, 1856, p. 430, No. 525.' — Turbonilla (Pyrgolampros) valdezi Dall 

 and Bartsch, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 502, pi. 44, figs. 3, 3a. 



Shell inflated, robust, broad and stumpy, of light fulvous coloration. 

 Nuclear whorls decollated in the type. Post-nuclear whorls flattened, 

 somewhat contracted at the periphery and rounded at the summit, 

 traversed by broad, coarse, irregularly slanting axial ribs, which 

 extend over the inflated periphery of the last whorl to the umbilical 



