Voiu XI] BERRY-FOSSIL CHITONS 



Material Examined : 



443 



Locality 



Chiton Bed, Pt, Fermin, Gal 

 Chiton Bed, Pt. Fermin, Cal . 

 Chiton Bed, Pt. Fermin, Cal . 



Chiton Bed, Pt. Fermin, Cal. 



Chiton Bed, Pt. Fermin, Cal. 



Chiton Bed, Pt. Fermin, Cal. 

 Chiton Bed, Pt. Fermin, Cal . 

 Chiton Bed, Pt. Fermin, Cal. 



Chiton Bed, Pt. Fermin, Cal . 



Nob Hill Cut, San Pedro, Cal. 



Nob Hill Cut, San Pedro, Cal. 



Nob Hill Cut, San Pedro, Cal. 



Crawfish George's, San Pedro, 

 Cat 



Crawfish George's, San Pedro, 

 Cal 



Crawfish George's, San Pedro, 

 Cal 



Coal mine, Pt. Loma, Cal . . . 



Deadman Id., San Pedro, Cal. 



Deadman Id., San Pedro, Cal. 

 Deadman Id., San Pedro, Cal. 

 Deadman Id., San Pedro, Cal. 

 Deadman Id., San Pedro, Cal. 

 Deadman Id., San Pedro, Cal. 

 Deadman Id., San Pedro, Cal. 

 Deadman Id., San Pedro, Cal. 

 Deadman Id., San Pedro, Cal. 



Collector 



R. P.&E. M.Chace, 1918 

 E. P. & E. M. Chace, 1918 

 E. P. Chace, 1918 



E. P. & E. M. Chace, 1918 



E. P. & E. M. Chace, 1918 



E. P.&E. M.Chace, 1918 



E. P. Chace, 1920 



E. P. Chace & S. S. Berry, 



1920 



E. P. Chace & S. S. Berry, 



1920 



OldroydCol! 



OldroydColl 



OldroydColl 



E. P. Chace, 1918 



E. P. Chace, 1918 



E. P. Chace, 1918 



C. L. Hubbs 



Arnold Coll 



Arnold Coll 



Arnold Coll 



Arnold Coll 



R. Arnold, May, 1901 ... 



Arnold Coll 



Arnold Coll 



Arnold Coll 



Arnold Coll 



Where Deposited 



Berry Coll. Cat. 4041 



Cal. Acd. Sci 



Berry Coll. Cat. 4041. 



/Chace Coll I 



1 Berry Coll. Cat. 4041 



I Cal. Acd. Sci i 



iBerry Coll. Cat. 410o{ 



Berry Coll. Cat.4105. . 

 Chace Coll 



Chace Coll 



Chace Coll 



Dept. Geology, 



Stanford Univ 



Dept. Geology, 



Stanford Univ 



Dept. Geology, 



Stanford Univ 



Berry Coll. Cat. 4046. 



Berry Coll. Cat. 4046 . 



Berry Coll. Cat, 4046 

 Berry Coll. Cat. 3932 

 Dept. Geology, 



Stanford Univ 



Dept. Geology, 



Stanford Univ 



Dept. Geology, 



Stanford Univ 



Dept. Geology, 



Stanford Univ 



Dept. Geology, 



Stanford Univ 



Dept, Geology, 



Stanford Univ 



Dept. Geology, 



Stanford Univ 



Dept. Geology, 



Stanford Univ 



Dept. Geology, 



Stanford Univ 



•2.21; 



11004 

 [1088 



| 94f) 



11035 



11089 



[1090 

 1 1364 



(1406 



[1407 



[ 654 



! 655 



[ 656 



[ 952 



[ 953 



[ 953 

 [ 550 



[ 689 



[ 697 



[ 719 



[ 690 



[ 692 



[ 702 



[ 720 



I 703 



I 721 



Formation 



Lower San Pedro . 

 Lower San Pedro 

 Lower San Pedro . 



Lower San Pedro . 



Lower San Pedro . 



Lower San Pedro . 

 Lower San Pedro. 



Lower San Pedro . 



Lower San Pedro. 



Lower San Pedro. 



Lower San Pedro. 



Lower San Pedro. 



Lower San Pedro. 



Lower San Pedro. 



Lower San Pedro 

 Upper San Peilro 



Period 



Pleistocene 

 Pleistocene 

 Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 

 Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 

 Pleistocene 



? Pleistocene 



? Pleistocene 



? Pleistocene 



? Pleistocene 



.' Pleistocene 



.' Pleistocene 



'.' Pleistocene 



1 Pleistocene 



Remarks: Valves of this species are not always easy to 

 discriminate from those of several of its living- allies, especially 

 as they are so often worn and broken. Well preserved speci- 

 mens should be quite readily identifiable by their coarse sculp- 

 turing, the longitudinal ribs of the central areas being heavier 

 and fewer than in such species as M. hindsii, while the ribs 

 bounding the central areas, as well as these areas themselves, 

 are more strongly granose. In shape the valves are generally 

 quite elevated and have an unusually shallow jugal sinus. 



Dall and Pilsbry have already called attention to the fact 

 that in this species the tegmentum of the median valves has a 

 sort of rounded, false beak in the middle in front, which is an 



