142 University of California Publications in Geology [VOL. 8 



whorl large ; mouth ovate ; outer lip simple ; inner lip smooth ; umbilicus 

 open and appears to be bounded by a line. 



Dimensions. Height, 18 mm. ; width of body whorl, 21 mm. 



Occurrence. This species is abundant in the basal beds of the Mar- 

 tinez, University of California Locality 1556, from which the type and 

 co-type were obtained. It ranges from the basal beds to uppermost 

 Martinez. 



This species is readily distinguished by its prominent spiral lines 

 from all other similar forms in the Eocene, except Bullinula subglobosa 

 Weaver. It differs from Bullinula subglobosa Weaver by having a 

 much wider aperture, by its distinct channeling between whorls, and 

 by a less prominent spire. 



AMAUKOPSIS MARTINEZENSIS, n. sp. 

 Plate 13, figures 4o, 46 



Shell elongated with very high spire for this genus; whorls six; 

 rounded on sides; suture deeply channeled and bordered by a narrow 

 flat margin which slopes to the suture. Aperture half oval; outer lip 

 simple ; inner lip thinly incrusted forming a fold which at first sight 

 seems to be an umbilicus. Surface marked by fine but well-marked 

 revolving lines and lines of growth. 



Dimensions. Height, 33 mm. ; width of body whorl, 28 mm. 



Occurrence. Martinez Group, University of California Locality 

 1540, one mile south of Stewartville. 



This species appears to be the precursor of Amauropsis alveata 

 (Conrad). It has a narrow channeling on upper portion of whorl 

 while A. alveata has a wide slightly concave channeling. The spire 

 of this species is decidedly higher than that of A. alveata. It differs 

 from A. oviformis Gabb in its greater height and in its decoration. 



TUKITELLA CLAEKI, n. sp. 



Plate 13, figure 8 



Shell short, conical with eleven whorls. When uneroded the whorls 

 lines with flatly channeled interspaces equal in width to ribs. The 

 are nearly flat. A faint angulation can be seen slightly below the 

 center of certain whorls. This angle is marked by a spiral line which 

 is somewhat stronger than the rest. The body whorl appears to have 

 a double angulation, the spiral line below its impressed linear suture 

 marking the upper angle. The decoration consists of flat-topped spiral 



