1916] 



Dickerson: Tejon Eocene of California 



503 



pits were once occupied by pebbles which the animal had agglutinized 

 to its shell. Only the type specimen and a fragment are known. 



Named for Mr. Chester Stock who has assisted the writer on 

 numerous occasions and who collected the type from the Tejon of 

 Rose Canon. 



Dimensions: — Height of broken type, 18 mm.; width of body 

 whorl, 30 mm. 



Occurrence: — University of California Locality 2226, Tejon 

 group, Rose Canon, San Diego County, California. 



