iOQ CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



AMAUROPSIS ANDERSONI, new species. 

 Plate 12, figures 2a and 2b. 



Shell of medium size, solid, thick, moderately elevated, 

 smooth except for growth-lines, with five whorls ; spire-whorls 

 rounded, their upper half being slightly tabulate, this tabulation 

 better marked on the body- whorl but none of the specimens has 

 this feature as well developed as AmaUropsis alveata (Conrad). 

 The general dimensions are about the same as in ^. alveata, 

 though the width in most specimens is slightly greater. The 

 body-whorl is decidedly globose with semilunar mouth; outer 

 lip simple; inner lip slightly incrusted and nearly covering a 

 small narrow umbilicus. 



Dimensions : Length, 27mm ; width of body-whorl, 25mm. 



This species resembles Amauropsis oviformis (Gabb) in gen- 

 eral outline but its umbilicus is much narrower and its spire- 

 whorls less rounded than in that species. 



Type: — No. 244, Cal. Acad. Sci. Locality 25, Roseburg 

 Quadrangle, Oregon, near the center of Sec. 19, T. 26 S., R. 3 

 W., on the east bank of Little River at its confluence with the 

 Umpqua, underneath the bridge at that point. Coll., Bruce 

 Martin. 



Named for Mr. F. M. Anderson, Curator of the Department 

 of Invertebrate Paleontology, California Academy of Sciences, 

 who made extensive collections from the region with which this 

 paper deals. 



AMAUROPSIS UMPQUAENSIS, new species. 

 Plate 12, figures Za and Zh. 



Shell large, solid, thick, much elevated, smooth except for in- 

 cremental lines, with six or seven whorls ; spire-whorls rounded 

 and their upper third somewhat tabulated. This species is 

 much longer than A. andersoni Dickerson or A. alveata Gabb, 

 and the spire is much higher; body-whorl longer than the 

 width; outer lip simple, with a marked shouldering at linear 

 impressed suture ; inner lip covered by a thin callus which nearly 

 covers a small narrow umbilicus. 



Dimensions : Length, 41mm ; width of body-whorl, 

 33mm. 



Type:— No. 245, Cal. Acad. Sci. Locality 25, Roseburg 

 Quadrangle, Oregon, near the center of Sec. 19, T. 26. S., 



