332 CALIFORNIA ACADEMY OF SCIENCES. 



closely resembled the preceding one; height of spire 

 0.50 inch, breadth 0.50. On the proportionate scale the 

 base of shell must have been about 0.75 inch wide. It 

 much resembled the living C. gemmulatum Carp., in form, 

 but differed in sculpture ; also differs from the other two 

 species before described from the cretaceous beds of Cal- 

 ifornia. Found by W. L. Watts in the head-wall of the 

 San Joaquin coal mine, together with several other spe- 

 cies of Cret. A and B.* 



4. Sigaretus costatus n. sp. Plate xlvii, fig. 6, twice 

 natural size. 



Outline oval; whorls about three, the outer enclosing 

 the others, haliotiform; surface covered by about 18 con- 

 centric ribs, strong, rounded, and with very narrow inter- 

 vals between ; they appear granulated by intersection 

 of coarse lines of growth. Length 0.45 inch, breadth 

 0.35, height 0.12. 



One specimen from head-wall of San Joaquin Mine. 

 It is filled with asphaltum, coloring it dark brown, and 

 appears similar in form to the Stomatia intermedia of 

 San Diego Cret. A (Bulletin iv, 1894, p. 46, pi. 3, fig. 

 43), but has no other resemblance, and comes nearer 

 "St'num -planicostum" Gabb,of the Los Angeles Pliocene, 

 which, however, is identical with the living Sigaretus 

 deb His Gould, of Catalina Island to Gulf of California. 



5. Opis triangulata J. G. Cooper (Stanton). Plate xlvii, 

 figs. 7, 8, 9, the two last twice the natural size. 



Corbula triangulata Cooper. State Min. Bur. Bull, iv, 49, pi. 2, 



fig. 42. 

 Opis triangulata Cooper. Stanton, Bull. 133, U. S. Geol. Sur. , 



1896, p. 59. 



* The Polamides carbonicola, described in Bulletin 4, 1894, p. 44, 

 from the California Coal Mine, near Huron, Fresno County, has lately been 

 received from Cret. B. beds near San Diego, many feet higher than the 

 lignite, but with other fossils of similar age. 



