48 PALAEONTOLOGY OF CALIFORNIA. 



every species. The most important character, that of the callus, was entirely lost 

 sight of from the fact that the specimens were mutilated, and the author was not 

 even aware of its existence. His name Schizopyga will therefore have to be 

 dropped, and Ccesia adopted in its place. 



For the leading points of synonomy of these two species, see appended list. 



FICUS, Bolt. 



F. PYRIFORMIS, 11. S. 

 PL 14, Fig. 4. 



Shell pyriform, body whorls rounded, slightly flattened on the 

 sides, shouldered, the top sloping upward, with nearly a straight 

 line to the suture; whorls four to four and a half, spire low, suture 

 indistinct. Aperture rather narrow, canal moderate, and slightly 

 curved. Surface ornamented by about forty small, distinct revolv- 

 ing ribs, with occasional smaller ones interposed, all crossed by 

 prominent lines of growth, more closely placed, and not so large 

 as the revolving sculpture. 



Length, 2.3 inch (end of canal broken) ; width, 1.2 inch; height of apex from 

 posterior angle of aperture, .35 inch. 



From the Miocene, Martinez. Collected by Mr. Mathewson. 



From the recent F. Dussumieri, its nearest ally, this species differs by its slightly 

 higher spire and less slender, regular form, narrowing more suddenly in advance. 

 Prom the lines of growth, the canal, which is broken in the present specimen, 

 seems to have been shorter than in the living shell. 



F. NODIFERUS, U. S. 

 PL 14, Fig. 5 



Shell subpyriform, short, robust, subangulated, side and top 

 of body whorl flattened, upper surface nearly straight, and sloping 

 directly upwards to the suture; upper angle of the whorl carry- 

 ing a series of about ten flattened nodes, in some cases double ; 

 below these, about the middle of the whorl, is another series, less 



