I 914 ] Dickerson : Fauna of the Martinez Eocene of California 145 



Dimensions. — Length, 20 mm. ; width of body whorl, 6 mm. 

 Occurrence. — University of California Locality 784, near Lower 

 Lake. 



Named in honor of Mr. Percy W. Thomson, Geologist, Standard Oil 

 Company. 



OVULA MAETINI, n. sp. 

 Plate 14, figures la, lb 



Shell ovoid, widest about one-third of the distance from the upper 

 end, suddenly narrowing below ; under surface flattened. Mouth 

 straight, medium width. Outer lip broad and rounded. Canal un- 

 usually long for this genus. 



Dimensions. — Greatest width, 28 mm. ; length, 42 mm. 



Occurrence. — Martinez Group, University of California Locality 

 243, and two and one-half miles south of Muir Station, and one-half 

 mile east of the road which crosses the Briones Hills going south from 

 Muir Station, on north slope of a small tributary of a tributary of 

 Arroyo del Hambre, elevation 550 feet, 100 yards north of Monterey- 

 Martinez contact. 



This form differs from Cypraea bayerquei Gabb in that its canal is 

 much longer, it is much thicker and its shape is different. 



TEITONIUM(I) BUWALDI, n. sp. 

 Plate 15, figure 3 



Shell fusiform, robust; spire probably high; number of whorls 

 unknown, the spire being defective. Surface of body whorl orna- 

 mented by about fourteen moderately long nodose longitudinal ribs at 

 thickest part of whorl. These ribs are parallel with the axis. They 

 do not extend to the impressed suture above. Slightly below the 

 middle the body whorl is decorated by eight prominent spiral ribs with 

 interspaces twice as wide. Mouth oval ; inner lip slightly incrusted( ?) ; 

 outer lip, defective ; canal long, slightly curved. 



Dimensions. — Length of broken specimen, 37 mm. ; width of body 

 whorl, 25 mm. 



Occurrence. — Only one specimen of this species was found, at 

 University of California Locality 790, near Lower Lake. 

 Named in honor of Mr. J. P. Buwalda. 



