NO. 12 STRONG AND HERTLEIN : MARINE MOLLUSKS 193 



of varicose swellings are similar to those on some species of Strombina 

 in their younger stages but these specimens seem to be fully mature. 

 The general aspect is more that of Mitrella. 



Epitonium (Asperoscala) slevini Strong & Hertlein, new species 



Plate 18, Fig. 9 



Shell small, pure white; nuclear whorls 4, elevated, noticeably 

 smaller than the first postnuclear whorl, smooth; postnuclear whorls 6, 

 well rounded, separated by a deep suture, regularly increasing in size, 

 forming a slender turreted spire; axial sculpture of 14 thin, strongly 

 reflected varices, without angle or spine where they curve into the suture 

 in which they meet and fuse, ascending the spire in a continuous line 

 approximately parallel with the right side of the shell ; on the base the 

 varices continue without change to the base of the columellar lip; spiral 

 sculpture of strongly incised spiral lines of which about 12 appear on 

 the spire and 18 on the last whorl; aperture nearly entirely broken 

 away in the type. The type measures : length, 4.3 mm ; diameter, 2.0 mm. 



Holotype: No. 724 (Calif. Acad. Sci. Paleo. Type Coll.), from 

 Loc. 27,228 (C.A.S.), dredged in from 3 to 9 fms. off Taboga Island, 

 Panama. It is probably not fully adult. L. G. Hertlein collector. Three 

 additional but younger specimens were dredged at the same locality. 



No other species with similar spiral sculpture and approximately 

 this number of unarmed varices seems to have been described from the 

 west coast of the Americas. 



This species is named for Mr. Joseph R. Slevin, Curator of Herpe- 

 tology of the California Academy of Sciences, who has collected numer- 

 ous specimens for the Department of Paleontology of the same insti- 

 tution. 



Epitonium (Nitidiscala) wurtsbaughi Strong & Hertlein, 



new species 

 Plate 18, Fig. 14 



Shell small, pure white; nuclear whorls a little over 3, elevated, 

 smooth ; postnuclear whorls 6, well rounded, separated by a deep suture, 

 rapidly enlarging, forming a broadly turreted spire; axial sculpture of 

 7, thin, high varices which meet and fuse in the suture and ascend the 

 spire in a continuous line approximately parallel with the right side of 



