98 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



The type and one other specimen (Cat. no. 206877, U.S.N.M.) were 

 dredged by the U. S. Bureau of Fisheries at station 2813, in 40 

 fathoms, on coral sand bottom, off the Galapagos Islands, South 

 America. It has ten post-nuclear whorls and measures: Length 5.6 

 mm., diameter 1.2 mm. 



Named for Prof. B. Shimek. 



TURBONILLA (PYRGISCUS) SANCTORUM, new species. 

 Plate 9, figs. 2, 2a. 



Shell elongate-conic, milk-white. Nuclear whorls two and one- 

 fourth, forming a depressed, helicoid spire, the axis of which is at 

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

 about one-fourth immersed. Post-nuclear whorls very strongly 

 rounded, appressed at the summits, contracted at the periphery, 

 marked by strong sublamellar, slightly protractive axial ribs, of 

 which 16 occur upon the first to eighth, 18 upon the ninth, and 20 

 upon the penultimate turn. Intercostal spaces about four times 

 as wide as the ribs, marked by two series of broad spiral pits, one of 

 which is at the periphery, the other a little posterior to the middle of 

 the space between the sutures. In addition to these pits there are 

 fine, almost equal, incised spiral lines, of which eight occur between 

 the peripheral and median pits and ten between the median and 

 the summit. Sutures strongly constricted. Periphery marked by a 

 narrow plain band. Base well rounded, marked by the feeble con- 

 tinuations of the axial ribs and fourteen equal, fine wavy, incised 

 spiral lines. Aperture subquadrate; posterior angle obtuse; outer 

 lip thin, showing the external markings within; columella very 

 oblique, almost straight, reflected. 



The type and twenty specimens (Cat. no. 162514, U.S.N.M.) were 

 dredged at U. S. Bureau of Fisheries station 2823, off La Paz, in 26^ 

 fathoms, off Lower California. The type has ten post-nuclear whorls 

 and measures: Length 5.8 mm., diameter 1.3 mm. Cat. no. 162516, 

 U.S.N.M., contains four specimens dredged at U. S. Bureau of Fish- 

 eries station 2827, off Ceralvo Island, Gulf of California, in 10 fathoms, 

 oft' Lower California. 



TURBONILLA (PYRGISCUS) EUCOSMOBASIS Dall and Bartsch. 



Plate 10, figs. 11, llrt. 



Turbonilla (Pyrgiscus) eucosmobasis Dall and Bartsch, Proc. U. S. Nat. Mus., 

 vol. 33, 1907, pp. 507-508, pi. 45, figs. 8, 8a. 



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

 rather small, composed of two and one-half whorls, helicoid with 

 much depressed spire, somewhat obliquely 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 



