CRETACEOUS FOSSILS. 105 



times there is a smaller one on the penultimate volution. I have 

 not always been able to detect the latter. 



Figures, natural size. The View of the aperture is a restoration, based on seve- 

 ral fragments showing different portions of that aspect of the shell. 



Localities: Bull's Head Point, Martinez; Clayton, Contra Costa County, in 

 strata overlying the coal (in Division B.); and some specimens were collected 

 near San Diego, by Dr. Cooper. 



FICUS, Klein. 



Sycotypus, Brown. 



? F. cypr^oides, n. s. 



PI. 19, Fig. 58. 



Shell subcorneal, resembling a young Cyproza; spire very low; 

 whorls four, barely exsert; body whorl large, broadly rounded 

 above, sides nearly straight and approaching anteriorly; suture 

 faint. Surface marked by rather distinct lines of growth, and 

 anteriorly by a few obsolete, oblique, revolving lines. Aperture 

 simple ; columella very slightly curved in the middle. 



Figure, natural size. 



Locality: Tuscan Springs, Tehama County; collected by Dr. Veatch. 



The remarkable resemblance of this shell to a young, imperfect Cyjircea, has 

 suggested its specific name. That this is its adult, perfect form, cannot be doubted, 

 since I have seen half a dozen good specimens. It is probable that the generic 

 reference given above will have to be changed ; but I know of no described genus 

 more suitable than the one to which it is referred, and do not feel warranted, 

 with the material before me, in instituting a new genus to receive the shell. 



LUNATIA, Lam. 



L. AVELLANA, n. S. 

 PI. 19, Fig. 60. 



Subglobose, spire somewhat elevated; whorls five, convex; 

 suture impressed. Aperture subelliptical, narrow behind, 

 rounded; a little produced anteriorly. Columella incrusted by 

 a moderate callus of uniform thickness throughout its whole 



PAL. VOL. I. — 14 



