— 65 — 

 Explanation of Plates— Continued. 



0!) 



B 



Formation and 

 Locality. 



Cret. 



Tert. 



M 



47 



48-49 



50-51 



52 



53 



54 



55-56 



57 

 58 

 59 

 60 

 61-62 

 63 

 64 



65-67 



Crassatella lomana. For fine sculpture see description 



Megerlia dubitanda. Upper and lower odd valves 



Waldheimia imbricata --- 



Agasoma {Trophosycon) barkerianum. Mouth imperfect 



Pinna alamedensis. Yates' tj'pe was nearly twice as long as 

 this, and complete in form -- 



Pinna venturensis. Three fourths the size of largest found, 

 and with fewer ribs. Ventura County 



Pecten discus Conv&A. From the shells -. 



Lately received specimens from Tar Canon, Kern County, 

 on the "\V., have ears nearly perfect. They are nearly of 

 the outline given by Conrad, and have about six delicate 

 riblets radiating from the umbo, crossed by lines of 

 growth. One valve was flatter, as in P. latiauritus, but 

 that has 14-16 ribs. 



Planorbispabloanus.. ] rj.^^^ outlines are correct as copied 



. J , ,• ., • from the fossils, but the surface res- 



Anodonta hgmUca... ^oration is a fancy of the engraver. 



Limnxa contracosta.. J •'' 



Amnicola yatesiana. Magnified five diameters — 



Cucullsea bowersiana. From Orange County 



Agasoma kernianum. Very well represented -- 



Mytilus dichotomus. Umbonal end perfect when described, 

 but broken before figuring --- 



Pecten (Liropecten) estrellanvs Conrad. From two specimens, 

 to show the combination of characters assigned by Conrad 

 to three species ■- --- 



D 

 D 

 D 



CM 



K 

 K 



K 



It should be stated that while the figures represent the best of each 

 species, many points of the descriptions have been supplied from other 

 specimens, 



that are not shown in the figures. 



