64G PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



on the second to fourth, twenty; on the fifth they become decidedly 

 feeble; and on the remainder they are not at all differentiated. In 

 addition to the axial sculpture the surface of the shell is marked 

 by very fine, wavy, closely spaced spiral striations. Periphery of 

 the last whorl well rounded. Base moderately long, well rounded, 

 marked by lines of growth and spiral striations comparable to those 

 on the spire. Aperture broadly oval; outer lip thin, showing the 

 color markings wnthin. Columella curved, somewhat twisted, and 

 slightly revolute; parietal wall glazed with a thin callus. 



The type and 17 specimens, Cat. No. 214135, U.S.N.M., was 

 dredged by the U. S. steamer Alhaty^oss at station 5743, in 10-15^ 

 fathoms, on very fine sand and mud bottom, San Francisco Bay, 

 California. The type has lost the nucleus and probably the first 

 of the postnuclear turns. The eight remaining measure — length, 6.8 

 mm.; diameter, 2 mm. 



There are three additional lots of specimens in the collection of 

 the United States National Museum, likewise dredged by the U. S. 

 Bureau of Fisheries steamer Albatross in San Francisco Bay. These 

 are: Cat. No. 214433, 3 specimens, from station 5729, in 4| fath- 

 oms, on mud bottom; Cat. No. 214434, 16 specimens, from station 

 5744, in 5| fathoms, on sandy mud bottom; Cat. No. 214436, 4 

 specimens, from station 5703, in 8^ fathoms, on mud bottom. 



This species belongs to the obsoletely sculptured group of Pyrgo- 

 lampros^ embracing halistrepta^ pesa, rineUa, lituyana, and ore- 

 gonensis. 



TURBONIIiLA (PYRGOLAMPROS) HEMPHILLI, new species. 



Plate 44, fig. 8. 

 Shell elongate conic. Nuclear whorls moderately large, one and 

 one-half planorboid, having their axis at right angles to that of the 

 succeeding turns, in the first of which they are scarcely at all im- 

 mersed. The sides of the nuclear whorls project slightly beyond the 

 outline of the spire. Postnuclear turns feebly rounded, appressed 

 at the summit, marked by moderately strong, low, almost vertical 

 axial ribs, which are very feeble on the first two turns, on the third 

 and fourth there are 16, on the fifth to seventh there are 18, while 

 on the last turn they become decidedly enfeebled and too irregular 

 to permit counting. Intercostal spaces shallow, about as wide as the 

 ribs. Suture moderately constricted. The summit of the whorls 

 falls a little anterior to the periphery and gives to the whorls a 

 slightly over-hanging appearance. Periphery inflated, w^ell rounded. 

 Base moderately long, well rounded, marked by the feeble continua- 

 tions of the axial ribs, which extend to the umbilical chink. Entire 

 surface marked by fine, closely spaced, spiral striations. Aperture 

 broadly oval, posterior angle acute ; outer lip thin ; inner lip strongly 



