Vol. XI] BERRY— FOSSIL CHITONS 409 



chitons are for the most part species still to be found living in 

 this vicinity, but several of these are decidedly rare at so low 

 a latitude, and the entire facies of the association, as will be 

 brought out more fully a little later, is strikingly that of the 

 shores of Monterey and San Luis Obispo counties at the pres- 

 ent day. 



Tonicella I in eat a (Wood) 

 Cyanoplax hartwegii (Carpenter) 



" fackenthallce Berry 



Nuttallina calif ornica (Nuttall) 

 Mopalia muscosa (Gould) 

 " lignosa (Gould) 

 " ciliata (Sowerby) 

 Placiphorclla velata Carpenter 

 Cryptochiton stelleri Middendorff 

 Chceto pleura gemma Carpenter 

 Ischnochiton magdalenensis (Hinds) 



" cooperi Carpenter 



Callistochiton decoratus punctocostatus Pilsbry 



" " ferminicus Berry, new subspecies 



" crassicostatus Pilsbry 



By all odds the most abundant chiton in the bed is Nuttallina 

 californica, to which species are referable over two-fifths of 

 the 350 specimens obtained. Ischnochiton magdalenensis ac- 

 counts for another fifth, and Mopalia muscosa for nearly a 

 seventh of the total, a proportion probably not very different 

 from that one would encounter in tide-pool collecting in the 

 Monterey region at the present time. Of the remaining species, 

 Callistochiton crassicostatus, Cyanoplax hartwegii, Tonicella 

 lineata, and Mopalia ciliata, rank in abundance in the order 

 named. The others are scattering. 



10. Near the lighthouse, Point Fermin, Los Angeles 

 County, California (E. P. and E. M. Chace). 



This appears to be an exposure from which no faunal re- 

 ports have been published. Like the preceding, it appears to 

 be Lower San Pedro, and perhaps represents part of the same 

 general deposit, but the chitons are relatively fewer and Nut- 

 tallina, the most abundant form at the Chiton Bed, is lacking 

 from the list. 



