382 PKOCEEDINGS OF THE CALIFORNIA 



doubt, as it appears to me, that the inclosing rocks in each .case exercise 'an 

 important iuflueuce on the mineral contents of the vein. 

 San Francisco, December 2d, 1867. 



Mr. Stearns read the following : 

 List of Shells collected at Bodega Bay, California, June, 1867. 



BY ROBERT E. C. STEARNS. 



In pursuance of the idea mentioned in my paper on the shells of Baulines Bay, 

 of examining the bays and coast to the north of San Francisco, I made a brief trip 

 to Bodega Bay in company with my friend Dr. Newcomb, on the thirteenth of 

 June, 1867. Most of the species enumerated were collected within a very limited 

 area, between tide marks, at the extreme point of Bodega Head, as the arm of 

 land is called, which extending in a southerly direction from the general line of the 

 coast, incloses what is known as Bodega Bay. The bay itself is, for the greater part, 

 left bare at low tide, and the flats then exposed, composed of sandy mud, contain 

 abundance of the common bivalves of the coast, principally Mcccoma, (two species) 

 and Tapes, in all its varieties : Saxidomus gracilis may also be found here in con- 

 siderable quantities, and is at certain seasons dug by the Indians, together with the 

 other bo called " clams." At the spot where the principal portion of this collection 

 was made, the outcropping rock is a coarse granite, upon which Litorina planaxis 

 is found in great numbers. The limited time at my disposal, at the season when the 

 trip was made, was only sufficient to admit of a brief, and therefore unsatisfactory 

 reconnoissance ; nevertheless, at least seventeen species were detected which have not 

 heretofore been found (or reported) so far to the north. Many of these species I 

 failed to find at Baulines, and some of them have not been reported north of 

 the Bay of Monterey. At Baulines, the rocks are principally shales, and contain 

 many species of pholads, which as will be seen by a glance at this list, if not 

 entirely absent, must be rare at Bodega; the various "nestlers" which are found 

 associated with the borers are also wanting; Haliotis rufesccns is abundant upon 

 the rocky islets off the coast, but not even a fragment of H. Cracherodii was met 

 with. 



1. Crvptomya Californica, Conr. 



2. Schizothaerus Nuttalli, Conr. 



3. Entodesma saxicola, Baird. 



4. Mytilimeria Nuttalli, Conr. 



5. Machaera patula, Dixon. 



6. Macoma secta, Conr.* 



7. nasuta, Conr. 



8. Tellina Bodegensis, Hds. 



9. Tapes staminea, Conr.:}; 



10. var. Petitii, Desh4 



11. var. ruderata, Desh4 



12. var. diversa, Sby4 



13. Saxidomus gracilis, Gould.* 



14. Chama exogyra, Conr.* 



15. Cardium corbis, Mart. 



16. Lazaria sub-quadrata, Cpr. 



17. Kellia Laperousii, Desh. 



18. Lasea rubra, Mont. 



19. Mytilus Californianus, Conr. 



20. edulis, Linn. 



21. Modiola fornicata, Cpr.* 



22. recta, Conr.* 



23. Axinoea subobsoleta, Cpr. 



24. Pecten hastatus, Sby. 



25. Hinnites giganteus, Gray. 



26. Placunanomia machrochisma, Desh. 



27. Helix Nickliniana, Lea. 



28. Columbiana, Lea. 



