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



Dimensions : — Altitude of the type specimen, 34 mm. ; maxi- 

 mum width of the shell, 24 mm. 



Type: — No. 178, and cotype No. 179, Cal. Acad. Sci., from 

 the lower Miocene of Kern River, locality 65, on the west bank 

 of a small canyon 1^4 miles northeast of Barker's ranch house. 



Thais blakei, new species 

 Plate 6, figures 4a and 4b. 



Shell solid, fusiform, with six whorls ; spire moderately 

 high; whorls of the spire with a well rounded angle near the 

 anterior margin, flat or concave above, restricted near the 

 suture, sculptured with spiral cords and coarse, raised, axial 

 lines of growth ; seven or eight spiral cords on the penultimate 

 whorl, separated by wider interspaces which occasionally carry 

 a fine intercalary thread ; suture appressed ; body-whorl with a 

 well rounded shoulder a little in front of the suture, concave 

 above, inflated below, sculptured in the same manner as the 

 whorls of the spire ; aperture ovate, outer lip thickened, denticu- 

 late within, inner lip smooth, incrusted ; canal short, recurved ; 

 columella twisted, with anterior sulcus. 



Dimensions : — Altitude of the type, apex defective, 34 mm. ; 

 maximum latitude of the shell, 17 mm. ; length of the aperture, 

 including the canal, 21 mm. ; width of the aperture, 6 mm. 



Type: — No. 180, and cot3^pe No. 181, Cal. Acad. Sci., lower 

 Miocene of Kern River, California, locality 65, on the west 

 bank of a small canyon P/4 miles northeast of Barker's ranch 

 house. 



Thais blakei resembles Thais edmondi Arnold in general 

 form. It may be distinguished from the latter by its uniformly 

 larger size, longer canal, and the lack of nodes on the shoulder 

 or angle of the whorls. 



Thais panzana, new species 

 Plate 6, figure 6. 



Shell solid, of moderate size; whorls five or six; spire ele- 

 vated, conical; suture distinct, channeled; whorls of the spire 

 conical, slightl)'- concave above the middle, with a row of nodes, 

 around the anterior margin giving them an angular appear- 



