Vol. IV] ANDERSON AND MARTIN— NEOCENE RECORD 73 



Occurrence : — From the lower Miocene of Kern River, Cali- 

 fornia, locality 65. 



Type: — No. 153, and cotype No. 154, Cal. Acad. Sci., Kern 

 County, California, on the west bank of a small canyon, P/4 

 miles northeast of Barker's ranch house. 



Genus AGASOMA Gabb 



Agasoma columbianum, new species 



Plate 5, figures 6a and 6b. 



Shell large for the genus, conical above and below, revolute, 

 tuberculated ; spire high, having five or six conical whorls, slop- 

 ing evenly to an acute apex ; body-whorl angulated, carrying 

 three rows of laterally elongated tubercules ; the upper row 

 most prominent and separated from the next row below by a 

 concave surface ; aperture ovate, broad in the middle, narrow 

 before and extended into a moderately long recurved canal; 

 outer lip thin and entire; inner lip incrusted; surface of the 

 shell ornamented chiefly with revolving threads, three of which 

 are prominent, forming the angles and elevated into tubercules ; 

 the spiral threads alternating in size and of three or four 

 ranks, crossed at unequal intervals by sinuous lines of growth ; 

 suture broadened by thickened and wrinkled collar ; canal wide 

 and curved; the aperture is greater in length than the height 

 of the spire. 



Dimensions : — Altitude of the type specimen, 56 mm. ; maxi- 

 mum width of the shell, 40 mm. ; length of the aperture, 35 to 

 40 mm. 



Occurrence : — Pittsburg Bluff, Nehalem River, and near 

 Clatskanie, Oregon. This species is not uncommon in the 

 01igocene( ?) of the Pittsburg horizon. It is not known in the 

 rocks of the Astoria Group or in the older rocks below. It is 

 usually associated with Macrocallista pittsburgensis Dall, 

 Molopophorids gabbi Dall, and Nucida shumardi Dall. 



Type: — No. 155, and cotype No. 156, Cal. Acad. Sci., Pitts- 

 burg Bluff, Nehalem River, Oregon. 



Agasoma acuminatum, new species 

 Plate 5, figures 4a and 4b 

 Shell rather large, fusiform ; spire elevated though shorter 

 than the mouth, with five or six whorls ; whorls angulated a 



