NEW FOSSIL MOLLUSCA OF CALIFORNIA. 33 1 



2. Littorina subobesa n. sp. Plate xlvii, figs. 3 and 4, 

 twice natural size. 



Outline ovate, less round than that of L. ?'udis, approach- 

 ing that of L. obcsa of the Pacific islands, without the 

 subangled base; whorls 4 to 5, rounded, polished, with 

 microscopic revolving impressed lines closely arranged; 

 mouth over half of length, semioval, the columellar mar- 

 gin being nearly straight; imperforate. Length 0.60 to 

 0.70, width 0.40 to 0.45 inch. Morley, Shasta County, 

 colored brown; Marysville Buttes, yellowish; False Bay, 

 San Diego, blackish. These colors, however, may not 

 have been those of the living shells. The first locality is 

 certainly cretaceous A, the others cretaceous B, or 

 Eocene, containing many species of that age. The shells 

 figured are from the first two localities. 



Collected for the Mining Bureau by its assistants, and 

 duplicates presented to the California Academy of Sci- 

 ences. Those from the second place named have a very 

 fresh appearance but were found in a very hard lime- 

 stone. I formerly supposed them to be a form of L. cont- 

 ractu Gabb, but they seem too different and too uniform 

 in their differences to be so called. I referred to them 

 by that name in my catalogue of San Diego Fossils, 

 Bulletin of Mining Bureau, No. 4, 1894, p. 61. 



3. Calliostoma lignitica n. sp. Plate xlvii, fig. 5, twice 

 natural size. 



Outline pyramidal; higher than wide; whorls six, first 

 three turbinate, smooth (worn?), fourth with 20 vertical 

 ribs crossed by three strong revolving ribs regularly can- 

 cellating the surface and continuing with wider intervals 

 to the body -whorl; upper surface of whorls nearly flat, 

 with a peripheral right angle from which the side of whorl 

 drops vertically; sutures nearly hid by a prominent rib; 

 body-whorl absent from only specimen, but must have 



