CRETACEOUS FOSSILS. 107 



bilicus small, partially covered. Surface marked by irregular 

 lines of growth. 



Figure, natural size. 



Locality: Alizos Creek, near Fort Tejon. All of the specimens of this species 

 were collected by Dr. Geo. H. Horn. 



L. NUCTFORMIS, 11. S. 

 PI. 28, Fig. 218. 



Shell small, subglobose ; spire moderately high ; whorls not 

 enveloped to such an extent as in the preceding species, five to 

 six in number ; the extreme apical whorl very minute. Mouth 

 wide, broadly rounded in advance. Outer lip nearly straight, or 

 slightly more prominent near the suture ; inner lip simple, or but 

 slightly thickened. Umbilicus open, deeply perforated. Surface 

 marked only by lines of growth. 



Figure, natural size. 



Locality: Alizos Creek, near Fort T€jon; and near Clayton (Division B.). A 

 number of specimens, apparently belonging to this species, were collected by Dr. 

 Cooper at San Diego ; but they are not in a sufficiently good state of preservation 

 to decide the point positively. 



? L. (GYRODES ?) CONRADIANA, n. S. 

 PI. 29, Fig. 219. 



Shell large, compressed-subglobose ; spire somewhat promi- 

 nent; whorls five, rounded ; suture linear. Aperture elongated, 

 terminating about equally at its upper and lower extremity. 

 Outer lip sinuous, most prominent near the suture, and retreating 

 below in a broad curve; inner lip simple. Umbilicus broadly 

 open, perspective, forming about half of the diameter of the lower 

 aspect of the shell; margin subangular. Surface, externally and 

 in the umbilicus, marked by fine lines of growth. 



Figure, natural size. 



Locality : Two specimens, from Division A., on the San Luis Gonzaga Ranch, 

 at the east end of Pacheco's Pass. 



