WEST AMERICAN PYRAMIDELLID MOLLUSKS. 73 



and probably the first post-nuclear whorl; those remaining measure: 

 Length 9.5 mm., diameter 2.7 mm. Two topotypes are in the collec- 

 tion of the University of California. 



TURBONILLA (PYRGOLAMPROS) LITUYANA. new species. 

 Plate 5, fig. 8. 



Shell elongate-conic, light wax 3^ellow, with a supra and subperiph- 

 eral light chestnut band, separated by a very narrow, dark wax 

 yellow peripheral zone. (Nuclear whorls decollated.) Post-nuclear 

 whorls rather high between the sutures, eaily ones with moderately 

 strong, broad, low, almost vertical axial ribs, which become quite 

 obsolete on the last turn and a half. About 22 of these ribs appear 

 upon the eighth whorl. Intercostal spaces narrow and weakly 

 impressed. Sutures well rounded. Periphery and base of the last 

 whorl well rounded, the latter marked by continuations of the obsolete 

 riblets and the fine, close, wavy s})iral striations which also cover the 

 entire surface of the spire. Aperture oval; posterior angle acute; 

 outer lip thin; columella slender, oblique, slightly curved and revolute, 

 with a slight fold at its insertion; parietal wall covered by a thin callus. 



The type (Cat. no. 1G0208, U.S.N.M.) was collected by Dr. W. H. 

 Dall, at Lituya Bay, Alaska. It has the last nine post-nuclear whorls, 

 having lost the nucleus and probably the first two post-nuclear turns, 

 and measures: Length 1L5 mm., diameter 3.7 mm. Two additional 

 specimens (Cat. no. 160207, U.S.N.M.) were also collected by Doctor 

 Dall in the same locality, in 8 fathoms, on sandy bottom. 



TURBONILLA (PYRGOLAMPROS) OREGONENSIS Dall and Bartsch. 



Plate 5, fig. 5. 



Turbonilla (Pyrgolampros) oregonensis Dall and Bartsch, Proc. U. S. Nat. Mus., 

 vol. 33, 1907, pp. 503, 504, pi. 45, fig. 2. 



Shell elongate-conic, wax yellow, with two yellowish-brown spiral 

 bands, the posterior one of which encircles the turns a little above 

 the periphery, while the anterior one, which is a little wider, is imme- 

 diately posterior to it, the two being separated by a space about 

 as wide as the posterior band. (Nuclear whorls decollated in all our 

 specimens.) Post-nuclear turns very slightly rounded, moderately 

 contracted at the peripheiy, and closely appressed to the preceding 

 turn at the summit. There are no well-defined ribs, the axial sculpture 

 being reduced to mere lines of growth, with here and there a weakly 

 impressed area, probably representing an obsolete intercostal space. 

 Sutures strongly impressed. Periphery of the last whorl faintly 

 angulated. Base short, well rounded. Entire surface marked by 

 fine, regular, close, spiral striation. Aperture pyriform, posterior 

 angle acute; outer lip thin, columella somewhat twisted, scarcely 

 revolute at its free end. 



