Ko. 16^4. WEST AMERICAN PYRAMiDELLIbA-D ALL AND BARTSCH. 507 



stronger upon the sides of the ribs and feebl}^ over their summits. In 

 addition to this sculpture, the spire is marked by many tine lines of 

 growtii and many tine spiral striations between the incised lines. 

 Sutures well marked, simple. Periphery of the last whorl subangu- 

 lated, marked by the feeble continuations of the axial ribs, which dis- 

 appear at the periphery. Base short, marked by 11 continuous, equal, 

 strong, incised spiral lines which are more closely spaced above the 

 umbilical area than at the periphery; the space between the first basal 

 incised line and the first supraperipheral one being- a little wider than 

 the space inclosed between the spiral lines on the spire. Aperture 

 subquadrate, outer lip thin, showing the external sculpture within; 

 columella almost straight and vertical, slightl}' revolute. 



The aboA'e description is based upon 2 cotypes. One, an adult shell 

 (Cat. No. 168867, U.S.N.M.), has the last 10 whorls, having lost the 

 nucleus and probably the first two and one-half post-nuclear turns, 

 and measures: Length 9.7 mm., diameter 2.8 mm. It was dredged by 

 the U. S. Bureau of Fisheries steamer Albatross at Station No. 319-1 in 

 92 fathoms, on gray sand, bottom temperature 45.'^ 9, off Esteros Bay, 

 California. The other (Cat. No. 196232 U.S.N.M.) was collected by 

 Mrs. Oldroyd at San Pedro, California, and has the nucleus and 9 

 post-nuclear turns, and measures: Length 5.5 mm., diameter 1.8 mm. 

 Three specimens (Cat. No. 196233, U.S.N.M.) were dredged by the 

 Fisheries steamer Albatross at Station No. 2902 in 53 fathoms, fine 

 gray sand and mud bottom, temperature 45°, oft' Santa Rosa Island. 

 One in the collection of the University of California comes from Sta- 

 tion No. 122, near Redondo; another in the same institution was 

 dredged at Station No. 12, off Point Vincent. Two (Cat. No. 196231, 

 U.S.N.M.) were dredged in 12 fathoms at San Pedro by Mr. H. N. 

 Lowe. Another specimen was dredged by the University of Cali- 

 fornia at Station No. 30, off Catalina Island, and two at Station No. 58, 

 off San Diego, California, the last two lots being in the University 

 collection. 



TURBONILLA (PYRGISCUS) EUCOSMOBASIS, new species. 



Plate XLV, figs. 8, 8a. 



Shell .quite large, of very regular outline, creamy white. Nucleus 

 rather small, composed of 2^ whorls, helicoid with much depressed 

 spire, somewhat obliqueh^ about one-third immersed in the first of the 

 succeeding turns, the axis of the nuclear spire being almost at a right 

 angle to the axis of the later whorls. Post-nuclear whorls moderately 

 rounded, widest a little above the suture, sloping gently toward the 

 summit and more abrnptl}" toward the base, ornamented by moderately 

 strong, rounded, somewhat flexuous, axial ribs, of which about 18 

 appear upon the second, 20 upon the seventh, 22 upon the eighth., and 



