160 PALAEONTOLOGY OF CALIFORNIA. 



SYCODES, N. Gen. 



Shell subpyriforni, nearly of the shape of an immature 

 Cyprcea ; spire low. Aperture simple, narrowing slightly in ad- 

 vance, and with a shallow anterior notch ; columella straight in 

 front. Surface plain, or ornamented ouly by fine lines. 



I described the species on which this genus is founded, in the first vol. Pal. Cal., 

 under the generic name of Ficus. Since then I have been able to determine that 

 the form is constant, and, as I then supposed, the specimens are adult. So far as 

 I know, it is the oldest known form allied to Ficus, being from the Chico Group. 

 The species is rare, all the specimens coming from a single locality. 



The genus is evidently closely related to Ficus, differing principally in its pro- 

 portionally thicker shell, in the straight, short columella, and the anterior part of 

 the mouth continuing wide to the extremity, instead of narrowing as in all the 

 allied genera. 



S. cypr^oides, Gabb. 



(? Ficus cyprceoides, Gabb ; Pal. Cal., Vol. 1, p. 58, pi. 19, fig. 105.) 



EUSPIRA, Ag. 



An Oolitic genus, possessing all of the leading characteristics of the following 

 shell, the flattened and angulated upper surface of the whorls, the closed umbilicus, 

 and slight thickening of the columellar lip. In all of its peculiarities, except the 

 flattening of the upper portion of the volutions, it seems closely allied to Ampul- 

 Una and Lunatia. 



E. ALVEATA, Con. Sp. 



{Natica alveata, Con. ; P. E. R. Rep., Vol. 5, p. 321, pi. 2, fig. 8.) 

 (Amauropsis alveata, Gabb; Pal. Cal., Vol. 1, p. 110, pi. 19, fig. 59; pi. 21, fig. 111.) 

 (Ampullina alveata, Con.' ; Smithsonian Check List, No. 459.) 

 Characteristic of the Martinez and Tejon Groups. Common. 



