WEST AMERICAN PYRAMIDELLID MOLLUSKS. 67 



mit, ornamented by about 22 niotleiately developed, slightly retractive 

 axial ribs on each of the whorls. These ribs become quite obsolete as 

 they pass over the well-rounded periphery and base of the last whorl. 

 Intercostal spaces weak, much narrower than the ribs. vSutures quite 

 prominent, simple. Aperture large, broaiUy ovate, ])osterior angle 

 obtuse, somewhat effuse at base; outer lip thin, columella slender, 

 quite oblique, twisted, and re volute. 



Doctor Carpenter's type (Cat. no. 44936, U.S.X.M.), upon which 

 the description is based, has 6 post-nuclear whorls and measures: 

 Length 5.8 mm., diameter 2.4 mm. It bears the two localities Puget 

 Sound and Santa Barbara, and probably comes from Puget Sound. 



Three other specimens (Cat. no. 126660, U.S.N.M.) were collected 

 by Dr. C. F. Xewcombe at Victoria, Vancouver Island, British Colum- 

 bia, and five more by the Rev. G. W. Taylor at Departure Bay, British 

 Columbia, one of which is Cat. no. 196205, U.S.N.M., the others being 

 in the Taylor collection. This one has 9 whorls remaining and meas- 

 ures: Length 9.5 mm., diameter 2.S mm. 



TURBONILLA (PYRGOLAMPROS) PEDROANA Dall and Bartsch. 



Plated, figs. 12, 12a. ■* 



Turbonilla (Pyrgolampros) lowei pcdroaria Dall and Bartsch, Mem. Cal. Acad., 

 vol. 3, 1903, p. 279, pi. 2, figs. 3, 3a. 



Shell elongate-conic, posterior two-thirds between the sutures 

 light brown, anterior third and base darker, the two areas being 

 separated by a still darker narrow band. (Nuclear whorls decol- 

 lated.) Post-nuclear whorls flattened in the middle, rounded 

 toward the summit and the suture, ornamented b}' broad, low, 

 well rounded, slightly protractive axial ribs, which become slightly 

 flattened toward the summit; of which 16 appear upon the first and 

 second, IS upon the third to fifth, 20 upon the sixth, 22 upon the 

 seventh and the penultimate turn. Intercostal spaces almost as 

 wide as the ribs, shallow. Sutures well impressed. Periphery and 

 the rather short base of the last whorl somewhat inflated and well 

 rounded. Entire surface of spire and base marked by well incised, 

 closely spaced, fine, spiral striations; aperture rather small, oval; 

 posterior angle acute; outer lip thin, showing the external sculp- 

 ture and coloration within; columella sigmoid, slender and slightly 

 revolute. 



The type (Cat. no. 15275, U.S.N.M.) and three additional specimens 

 were dredged in 10 fathoms off San Pedro, California. The type 

 has 10 post-nuclear whorls and measures: Length 7 mm., diameter 

 2.3 mm. Cat. no. 163255, U.S.N.M., contains three specimens col- 

 lected at San Pedro by Mrs. Oldroyd. One specimen, Cat. no. 

 206865, U.S.N.M., dredged at U. S. Bureau of Fisheries station 

 4309, in 67 to 78 fathoms, on fine sand and broken shell bottom, 

 9 miles ofl" Point Loma Light, California. 



