336 CALIFORNIA ACADEMY OF SCIENCES. 



7. Cardita alticosta Gabb. Plate xlviii, fig. 10, natural 

 size. 



? Cardita alticosta Gabb, Pal. of Cal. ii, 268, pi. xxxvi, fig. 16. 



The type of this species was from near Arivechi, State 

 of Sonora, Mex. Mr. Watts has found apparently the 

 same species, not rare, in the Cret. B or Eocene beds, 

 along the Sespi branch of the Santa Clara River, Ven- 

 tura County and I have had one figured for comparison. 

 It is found associated with C .■planicosta (C. frorm Gabb) , 

 and others of that group of fossils. None of them are 

 perfect enough to show the hinge, but in form and sculp- 

 ture they seem the same. Three or four others of the 

 Arivechi species have also been found in southern Cali- 

 fornia since they were described. 



