Vol. XI] BERRY— FOSSIL CHITONS 429 



Remarks: It is unfortunate that only a single valve has been 

 discovered in all Dr. Clark's screenings of the only fossil Lepi- 

 dopleurid we have seen. It is a modest little species, apparently 



Fig. 4 



Fig. 4. Leptochiton clarki Berry, new species. Ventral aspect of same; 

 same scale as Fig. 3 ; camera outline. 



allied to the prevailing group of species now living along the 

 coast, although, chiefly because of the peculiar form of the 

 sutural laminae, I have been unable to identify it with any of 

 them. From L. nexus (Carpenter), as represented by a speci- 

 men from off Laguna," it differs in the much less sharply defined 

 lateral areas and their much more distinct radial liration, as 

 well as rather more numerous lirae of the central areas (55-60 

 instead of 50), which are not separated into distinct scales or 

 granules. 



Fig. 5 



Fig. 5. Leptochiton heat hi Berry. Dorsal aspect of right side of valve 

 v of paratype [124a] a recent specimen from 15 fathoms, off Monterey, Cali- 

 fornia ; same scale ; camera outline. 



Fig. 6 



Fig. 6. Leptochiton heathi Berry. Ventral aspect of same ; same scale ; 

 camera outline. 



From valves of L. heathi Berry, that of the fossil specimen 

 differs in being shorter and wider, in having a more angular 



s c. f. Proc. Cal. Acad. Sci., (4), v. 9, p. 8. 



