13 



The specimen originally figured by me from Jamaica was a 

 small example of this spacies which is much better figured and 

 described by Dall under the name of dcmivrgus. It n abundant 

 and of large size at Spring val-. 



My reference to comparilis ( Vu >mey and Holmes) is 

 uncertain, but I am inclined to suepsct'th t P. tccentricus ('.abb 

 belongs to this species. 



Pecien cfasica rdo — Con k a p. 



Arnold. California Pecten-. P. 71, PI. xi, F. 5. 6 also 

 PI. xvi, xvii, xviii. 



To avoid having to make a new name I take this as an 

 approximate identification merely. There is a large number of 

 Pectens in the miocene and their range of size and variation is so 

 great that without an ample supply of specimens and access to all 

 the literature it is difficult to be certain about the right name, 

 The Pectens not less than certain other Molluska found in the 

 Miocene Beds attain a great individual as well as numerical 

 development and the larger specimens assume characters different 

 from those of the smaller ones. 



Corbula viminea — Guppv. 



Journ. Geol. Soc. 1866, P. 293 PI. xviii F. n. 

 Dall, Flor. Foss. Pt. i;i., P. S50. 



Ostrea percrassa — Conrad. 



Tertiary Fossi's, Page 50. PI. xxv, F. 1 



Our specimens are thick and heavy, but they agree with 

 Conrad's Figure. The nam -j is appropriate. It may possibly be 

 the same as Ostrea iryonii Gab. ( Miocene Fossils 1S7S, P. 34S 

 PI. xlv, F. 27). The other two Forms of Oyster foand in the 



