CRETACEOUS FOSSILS. 173 



A small inconspicuous species from the Tejon Group, Tejon ; Dr. Horn. It 

 can be distinguished from ? A. (Patella) Traskii, of the Chico Group, by its ovate 

 instead of elliptical outline, and by the beak curving markedly in advance ; the 

 radiating ornaments are also much less marked than in the Northern shell. 



ACT^ONINA, d'Orb. 

 A. PUPOIDES, Gabb. 



PI. 28, Fig. 57. 

 (? A. pupoides, Gabb ; Pal. Gal., Vol. 1, p. 67, pi. 19, fig. 113.) 



This shell was described from a single specimen in which the anterior half was 

 broken away. I have since been able to verify my determination of the genus, 

 and to ascertain the remaining characters of the species. The apex is variable, the 

 form figured being the most common ; in some cases it is higher, in others more 

 blunt. The aperture is small, narrowed behind, rounded in advance ; outer lip 

 acute, slightly sinuous ; inner lip heavily incrusted in advance by a broad, non- 

 plicate callus, which extends around the anterior margin of the mouth, becoming 

 regularly smaller, and disappearing at the anterior end of the outer lip. 



The figure is natural size. 



From the Shasta Group, Cottonwood Creek. 



ACT^EONELLA, d'Orb. 



A. OVIFORMIS, n. .8. 

 PL 28, Fig. 58. 



SHELL elongate ovoid, sides nearly parallel in the middle; spire 

 unknown, whorls five or more, nearly straight on the sides, taper 

 ing, rounded in advance. Aperture narrow, straight, a little wider 

 in front, inner lip heavily incrusted in advance, and with two 

 moderate folds. Surface plain. 



Length (less the spire, broken away), 1.8 inch; width of body whorl, .85 inch. 

 A single broken specimen from the Chico Group, (?) Cottonwood Creek, Shasta 

 County ; easily distinguished by its slender form and subparallel sides. 



