Abt. 11 NEW AMERICAN MARINE MOLLUSKS BARTSCH 9 



the axial ribs, which evanesce shortly after passing the periph- 

 ery, and numerous, closely spaced spiral striations. Aperture 

 rather large, posterior angle acute; outer lip thin, showing the 

 external markings and color band within; columella slender, some- 

 what sinuous, slightly reflected over the base to which the pos- 

 terior third is adnate ; parietal wall covered by a thin callus. 



The type, Cat. No. 362147, U.S.N.M., has seven and one-half post- 

 nuclear whorls and measures, length, 6.4 mm.; diameter, 2.0 mm. 

 It comes from Shuyak, Afognak Island, Alaska. 



TURBONILLA (PYRGOLAMPROS) EYERDAMI, new species 

 Plate 2, fig. 12 



Shell large, elongate-conic, golden yellow, with a moderately broad 

 band of pale chestnut brown at the periphery. Nuclear whorls 

 decollated. Postnuclear whorls appressed at the summit which is 

 narrowly shouldered, flattened in the middle, moderately constricted 

 at the suture, marked by rather strong, regular and regularly spaced, 

 axial ribs, which are slightly protractively slanting on the early 

 turns, vertical in the middle, and slightly retractively slanting on 

 the last whorl. Twenty-two of these ribs occur upon the first to 

 the third turns, 20 upon the fourth to the seventh, 18 upon the 

 eighth, 22 upon the ninth, and 30 upon the last whorl. These ribs 

 are about as wide as the spaces that separate them. The ribs and 

 the intercostal spaces are marked by numerous, closely spaced spiral 

 striations. Suture moderately constricted. Periphery of the last 

 whorl inflated, well rounded. Base short, somewhat inflated, well 

 rounded, marked by the feeble continuations of the axial riblets, 

 which evanesce shortly after passing the periphery, and numerous 

 lines of growth and closely spaced spiral striations. Aperture oval, 

 posterior angle acute, outer lips thin, showing the external sculpture 

 and the color markings within; columella slightly curved, reflected 

 over and appressed to the base for half of its length; parietal wall 

 covered by a thin callus. 



The type. Cat. No. 362145, U.S.N.M., comes from Shuyak Strait, 

 Afognak Island, Alaska. It has lost the nucleus. The IOI/2 post- 

 nuclear whorls measure, length, 10.5 mm.; diameter, 2.7 mm. This 

 is a member of the Turbonilla {Pyrgolani'pr^os) halia Dall and 

 Bartsch group. It is not particularly closely related to any of the 

 described species. 



TURBONILLA (PYRGISCUS) DELMONTENSIS Bartsch 



Plate 2, fig. 11 



Shell elongate conic, golden brown, with the incised spiral lines 

 edged with red. Nuclear whorls decollated. Postnuclear whorls 

 20441—27 2 



