Vol. VII] WARING -STRATIGRAPHIC AND FAUNAL RELATIONS 77 



Named in honor of Dr. J. Perrin Smith of Stanford Uni- 

 versity. 



Since this manuscript was prepared, Lima hascltinei Dicker- 

 son, has been described,**' from the Martinez in the Mount 

 Diablo quadrangle, with the statement that it is the same 

 species as a Lima found by the Stanford Geol. Survey in the 

 Martinez just north of the Calabasas quadrangle. The writer 

 does not believe that the two species are the same. In compar- 

 ing them, conclusions must necessarily be drawn from a com- 

 parison of the two specimens themselves and from the figures 

 and descriptions of them. The figure of Lima haseltinei Dick- 

 erson (plate 8, fig. 2), is not even similar to Lima perrini War- 

 ing, and one can judge little better by comparison of the speci- 

 mens themselves. The small specimen (pi. 9, fig. 11) included 

 by Dickerson in his description of L. haseltinei could not pos- 

 sibly be L. perrini, and the writer has doubts as to its belonging 

 even to the same genus. In his description, however, Dr. 

 Dickerson has combined the characteristics of his two speci- 

 mens in a description of his type, the larger specimen, although 

 he apparently questions the identity of the two specimens him- 

 self. In his description, Lima haseltinei is described as having 

 square ribs. Lima perrini has distinctly fine linear ribs, is pro- 

 portionately higher than long, and one-third larger, besides 

 having a very different hinge-line. Since the type specimen of 

 Lima perrini is a right valve and the type specimen of Lima 

 haseltinei a left valve, no positive determination can be made at 

 this time. When more specimens are found at both localities, it 

 will either prove or disprove the identity of the two; but until 

 then it is best to consider them as distinct species. 



Macrocallista stantoni, new species 

 PI. 14, Figs. 1 and 6 



Shell ovate-trigonal, porcellanous ; umbones prominent, in- 

 curved, and excavated anteriorly ; anterior margin broadly 

 cuned ; basal margin broadly convex ; posterior sharply curved 

 and slightly produced at the base of the umbonal ridge which is 

 prominent and near the posterior cardinal margin; surface 



"Univ. Cal. Rul. Dept. Geol., vol. 8. no. 6, p. 126, pi. 8. fig. 2, 1914. 



