Vol. XI| 



BERRY— FOSSIL CH/70XS 



449 



tinctly beveled or grooved; tail valve with a single pair of 

 lateral slits and a small posterior sinus, often showing a minute 

 tooth at its apex; eaves spongy; slits 8, 1-1, 1-1. 



Recorded Range: 



Pleistocene: Lower San Pedro Series — Chiton Bed, 

 Point Fermin, California (Chace and Chace, !) ; near light- 

 house, Point Fermin, California (!). 



Formation doubtful — ? Deadman Island, San Pedro, 

 California ( !). 



Living: Sitka, Alaska, to Morro, San Luis Obispo 

 County, California ( !) ; also reported from Point Fermin, Los 

 Angeles County, California (Williamson) ; usually between 

 tides, but recorded to 30 fathoms. 



Mat cried Examined : 



Remarks: Several fossil valves seem referable to this spe- 

 cies, as they are not only of a size commensurate with that of 

 recent lignosa, but when moistened still exhibit distinct traces 

 of the peculiar flamed color pattern so characteristic of the 

 shell of the living animal. The largest entire specimen [694] 

 has a diameter of 21.2 mm. 



The condition of none of the material at hand is such as to 

 render an illustration worth while. 



12. Mopalia ciliata (Sowerby, 1840) 

 (Plate V, figs. 1-9.) 



1840. Chiton ciliatus Sowerby, Ann. Mag. Nat. Hist (n.s.), 



v. 4, p. 289. 

 1840. Chiton ciliatus Sowerby, Conch. 111., fig. 79. 

 1864. Mopalia Kennerleyi Carpenter, Rep. Brit. Assoc. Adv. 



Sci., 1863, p. 648. 



