PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 11 



(marked w in tbe list) from the material obtained in sinking a well* at 

 a distance of from ninety to one hundred and sixty feet below the 

 surface of the earth, and not far from the present sea-level. The matrix 

 is usually rather soft, composed of loosely aggregated grains of sand 

 or fine sandy mud, occasionally hardened by infiltration of lime-bearing 

 water. 



In the accompanying list, those species found living (R) at the present 

 day in the fauna of the Californian coast, between San Francisco and 

 San Diego, are marked L, those at present making part of the northern 

 or Oregonian fauna N, and those belonging to the fauna of Lower Cali- 

 fornia, the Gulf of California, Mexico, and Central America are marked 

 S. The extinct species (F) form a very small proportion of the whole, 

 as will be readily seen. 



7907 



T 7 • /v t _ / t-f- 1. \ "T~\ „ n 



San Diego. 



R 



N, L 



8 







R 



N,L 



y 





M 



K 



L 



/91U 





l| 



B 



L, S 



1 







R 



L, S 



2 





" 



R 



L 



3 







R 



L 



4 







R 



N, L 



5 



If /■ *1 v t j r>% i 





R 



N 



6 







R 



L 



7 







R 



L 



8 







R 



L 



y 







R 



L, S 



7920 







R 



L 



1 





1 



R 



N, L? 



2 





'* 



R 



X, L 



3 





- 



R 



L, S 



4 







R 



L. S 



5 







R 



S 



6 





<( 



R 



N, L 



7 





U 



R 



L 





1 I'iviorkln d/j/'w/t/t) #/ivtu i <? e T.itti 



<« 



it 





9 





ii 



R 



S 



7930 







R 



L 



1 





Santa Barbara. 



R 



L 



2 





San Diego. 



R 



L 



3 





u 



R 



N,L 



4 





" w. 



F 





5 





a 



F 





6 





(< 



R 



S 



7 







R 



L, S 



8 





<< 



R 



N 



9 





«< 



R 



N 



7940 





u 



R 



S 



1 





l« 



F 





2 





a 



F 





3 





t< 



F 





4 





«« 



R 



Lis 



5 





a 



R 



L, S 



6 





" IT. 



R 



L, S 



7 





i« 



R 



N,L 



8 





ft 



F 





9 





«< 



F 





7350 





«< 



R 



L 



1 





H 



R 



N, L 



2 





a 



R 



N 



* A list of species obtained from this well, with descriptions of new species, was 

 published by me in the Proc. Cal. Acad. Sci., v, pp. 296-299, 1874. 



