86 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



TURBONILLA (PYRGISCUS) WELDI, new species. 

 Plate 8, fig. 11. 



Shell large, chestnut brown with a broad peripheral light band, 

 and a light area about the columella. (Nuclear whorls decollated.) 

 Post-nuclear whorls well rounded, somewhat overhanging, strongly 

 contracted at the suture, appressed at the summit, marked by moder- 

 ately strong, rounded, slightly retractive axial ribs, of which 24 

 occur upon the third to fifth, 28 upon the sixth, and about 35 upon 

 the penultimate turn, upon which they are less regular than on the 

 others. Intercostal spaces a little ^\^der than the ribs, marked by 

 eight broad, deep spiral series of pits wliich are subequal, excepting 

 the three aboA^e the peripheral one, the median one of which is much 

 narrower than the rest. Sutures strongly constricted. Periphery 

 and base of the last whorl inflated, well rounded, marked by the 

 feeble continuations of the axial ribs, a broad line of pits immediately 

 below the periphery, and seven equal and equally spaced, broad, well 

 incised spiral lines. Aperture large, broadly oval, posterior angle 

 acute; outer lip very strongly curved, thin, showing the external 

 markings witliin; columella slender, twisted, curved and slightly 

 revolute. 



The type (Cat. no. 206868, U.S.N.M.) was dredged by the Uni- 

 versity of California at station 14, off Point Fermin, California. It 

 has lost the nucleus and probably the first post-nuclear whorl. The 

 eight remaining whorls measure: Length 8.8 mm., diameter 2.7 mm. 



Named for Prof. Laenas G. Weld. 



TURBONILLA (PYRGISCUS) NEREIA, new species. 

 Plate 8, figs. 1, la. 



Shell broadh" conic, pale yellow, with a broad dark wax yellow 

 band, which extends over a little more than one-half the distance 

 from the middle of the whorls to the summit, between the sutures. 

 A secondary of the same color extends from a little posterior to the 

 periphery to the middle of the base. Nuclear whorls small, two and 

 one-half, forming a depressed helicoid spire, the axis of which is at 

 right angles to that of the succeeding turns, in the first of wliich they 

 are very slightly immersed. Post-nuclear whorls flattened in the 

 middle, slightly rounded at the summit and at the periphery, orna- 

 mented by well rounded, strong, almost vertical axial ribs, which 

 become weakened toward the summit. These ribs are scarcely 

 indicated on the first and second whorls, upon the third and fourth 

 there are 20, upon the remaining (excepting the penultimate whorl 

 which has 20) there are 18. Intercostal spaces about double as wide 

 as the ribs, marked by nine spiral series of pits, all of which pass 

 strongly upon the sides of the ribs, but do not cross their summits. 



