Geol.— Vol. II.] ANDERSON— CRETACEOUS DEPOSITS. 93 



Meek under that name; yet Meek's species is smooth while 

 this one is costate, and there are some differences to be 

 seen in the septation. Neither does it agree with the cos- 

 tate variety of Gabb, which is that usually found near 

 Martinez. 



It appears remarkable that the widely distributed species 

 of cephalopod, Baculites vagina, has not been recognized 

 in the California Cretaceous deposits. It occurs both in 

 Southern India and on the west coast of Chile, and ought 

 to be found in the rich deposits of California, Oregon, and 

 British Columbia. Perhaps the nearest approach to it is 

 the above named species, brought from Orange County, 

 California, by Dr. H. W. Fairbanks. There is certainly a 

 very near relationship between the forms from Quiriquina 

 Island and the Santa Ana Mountains of Orange County. 



Occurrence. — This species is found associated with many 

 Lower Chico fossils near Silverado Canyon, in the Santa 

 Ana Mountains of Orange County, California. It occurs 

 along with Anchura calif ornica, Actmonella oviformis, 

 Pholadomya anadna, and Chione varians. 



Desmoceras. 



In the middle Cretaceous of California, forms of Desmoc- 

 eras belonging to the group D. plamilatiini are numerous. 

 Four or five types have been recognized that are capable of 

 specific discrimination, some of them having ver}'^ strong 

 resemblances to Atlantic forms, such as D. mayorianum 

 d'Orbigny. 



Among the members of this group is Desmoceras hoff- 

 manni Gabb.^ Gabb seems not to have recognized evident 

 differences among them and accordingly classed all under 

 one species, which does not appear to be justified. More 

 than twenty fairly well preserved specimens of this group 

 in the collections of Stanford University and the University 

 of California may easily be divided into three subgroups. 

 There can hardly be a doubt as to the distinctness of two 



1 Pal. Cal., Vol. I, PI. XI, not Vol. II, PI. XX. 



