440 



CALIFORNIA ACADEMY OF SCIENCES 



[Proc. 4th Ser. 



zag granulation over the two latter regions, the jugal tract 

 smooth; traces of the color pattern of white jugal triangles 

 often persistent, these giving way rather abruptly on the sides 

 to brown ; sutural laminae very long, pointed on the inner front 

 margin, the wide sinus steep-sloped and deep; tegmental bor- 

 der of median valves strongly arcuate in front; teeth of head 

 valve long and projecting, of median valves very weakly de- 

 veloped, of tail valve low, thickened, very irregular in width, 

 and strongly directed forward ; eaves and sinus spongy ; mucro 

 strongly posterior, often overhanging; slits 10 to 11, 1-1 

 (though with slit-rays 2-2), 7 to 9. 



Recorded Range: 



Pleistocene: Lower San Pedro Series — Chiton Bed, 

 Point Fermin, California ( !) ; Nob Hill Cut, San Pedro, Cali- 

 fornia ( !). 



Formation doubtful — Deadman Island, San Pedro, 

 California ( !). 



Living: Vancouver Island, British Columbia (Pilsbry), 

 to Piedras Blancas, San Luis Obispo County, California (Pils- 

 bry) ; between tides. 



Material Examined: 





Valve 



Int. . 

 Ant. 

 Int. . 

 Post. 

 Int.. 

 Post. 

 Ant.. 

 Int.. 

 Ant.. 

 Post. 

 Ant.. 



Int., 



Post 



Ant. 



Int. 



Int. 



Locality 



Chiton Bed, 

 Chiton Bed, 

 Chiton Bed, 

 Chiton Bed, 

 Chiton Bed, 

 Chiton Bed, 

 Chiton Bed, 

 Chiton Bed, 

 Chiton Bed, 

 Chiton Bed, 

 Chiton Bed, 



Pt. Fermin, Cal . 

 Pt. Fermin, Cal . 

 Pt. Fermin, Cal . 

 Pt. Fermin, Cal . 

 Pt. Fermin, Cal. 

 Pt. Fermin, Cal . 

 Pt. Fermin, Cal. 

 Pt. Fermin, Cal. 

 Pt. Fermin, Cal, 

 Pt. Fermin, Cal . 

 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, 

 Deadman Id., San Pedro, Cal 



Collector 



E. P. Chace, 1918 



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

 E. P. & E. M. 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, 1920 



E. P. Chace, 1920 



E. P. Chace, 1920 



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



1920 



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



1920 



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



1920 



OldroydColl 



OldroydColl 



Arnold Coll 



Where Deposited 



Chace Coll 



Berry Coll. Cat. 4040 

 Berry Coll. Cat. 4040 

 Berry Coll. Cat. 4040 

 Berry Coll. Cat. 4040 

 Berry Coll. Cat. 4040 



Chace Coll 



Chace Coll 



Berry Coll. Cat. 4964 

 Chace Coll 



Berry Coll. 



Cat. 4964.. 

 Cal. Acd. Sci. 



Chace Coll 



Dept. Geology, 



Stanford Univ. 

 Dept. Geology, 



Stanford Univ . 

 Dept. Geology, 



Stanford Univ . 



»5-« 



[ 944] 

 [1020] 

 [1027] 

 1028 

 1088 

 1084 

 [1361 

 [1362 

 1362] 

 [1363] 



[1403] 



[1404] 



[1405] 



[ 652] 



[ 653] 



[678] 



Formation 



Lower San 

 Lower San 

 Lower San 

 ower San 

 Lower San 

 Lower San 

 Lower San 

 Lower San 

 Lower San 

 Lower San 



Pedro. 

 Pedro. 

 Pedro , 

 Pedro . 

 Pedro. 

 Pedro . 

 Pedro. 

 Pedro. 

 Pedro . 

 Pedro. 



Lower San Pedro. 

 Lower San Pedro . 

 Lower San Pedro. 

 Lower San Pedro. 

 Lower San Pedro. 

 Lower San Pedro 



Period 



Pleistocene 

 Pleistocene 

 Pleistocene 

 Pleistocene 

 Pleistocene 

 Pleistocene 

 Pleistocene 

 Pleistocene 

 Pleistocene 

 Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 



Pleistocene 



Remarks: Specimens of Nuttallina are far from widely 

 distributed as fossils in spite of their present day abundance. I 

 have seen them in numbers only from the Point Fermin "Chiton 



