Fublications of the United States Government. 31 



From Tulare Valley: Meretri.r Tularena, n.sp.; Area microdonta, 

 n.sp.; Stramonlta petrosa, n.sp. 



From San Pedro: Telllna Pedroana, n.sp.; Tapes diversum, n.sp.; 

 Saxicava abrupta, n.sp.; Petrlcola Pedroana, n.sp.; Schtzothtxrus Nut- 

 talli, n.sp.; Mytilus Pedroana, n.sp.; Penitella spelssa, n.sp. (Recent); 

 Fissurella crenitlata, Sow.; Bicccinum interstriatumf 



From Carmello : Lutraria Traskei, n.sp. 



From Colorado Desert: Pecten deserti, n.sp.; Anomia subcostata, 

 n sp.; Ostrea vespertina, n.sp.; 0. Ileermanni, n.sp.; Anodonta Califor- 

 nieiisis, Lea. 



From San Fernando: Ostrea sp.? Pecten sp.? 



From Benicia : Turritella biseriata, n.sp.; Trochus sp.? 



Appendix, Article IV. Letter from Prof. J. W. Bailej"^, describing 

 the structure of the fossil plant from Posuncula River, p. 337. (This 

 plant was from a bowlder in the bed of Kern River, west slope of the 

 Sierra Nevada.) 



Pacific Railroad Reports, Vol. VI. Geological report of routes 

 in California and Oregon explored by Lieuts. R. S. 

 Williamson and H. L. Abbott; by John S. Newberry. 

 (33d Cong., 2d sess., Senate Ex. Doc. 78. 1857.) 



This report contains the following : 

 Chapter I. Geology of the vicinity of San Francisco. 

 II. Geology of the Sacramento Valley. 



III. Geology of the Western range, Sierra Nevada. 



IV. Geology of Pit River and Klamath Basin. 



Vol. VI, No. 2. Description of the Tertiary fossils col- 

 lected on the survey; by T. A. Conrad. 



The following species are described and figured in this report : 



Schizopi/ga Californiana, n.sp., Santa Clara, Cal. 



Cryptomya ovalis, n.sp., Monterey County. 



Thracia mactropsis, n.sp., Monterey County. 



Mya Monterei/ana, n.sp., Monterey County. 



M.f subsinuata, n.sp., Monterey County. 



Arcopagia medialis, n.sp., Monterey County. 



Tapes linteatum, n.sp., California. 



Area canalis, n.sp., Santa Barbara. 



A. trilineata, n.sp., Santa Barbara. 



A. congesta, California. 



Axinwa Barharensis, n.sp., Santa Barbara. 



Mulinia densata, n.sp., Santa Barbara. 



Dosinia longula, n.sp., Monterey. 



D. alta, n.sp., Monterey. 



Pecten Pabloensis, n.sp., San Pablo Bay. 



Pallimn estrellanum, n.sp., Estrella Valley. 



Janira bella, n.sp., Santa Barbara. 



Ostrea titan, n.sp., San Luis Obispo. 



Malea ring ens; Dolium ring ens (Cassis), Swain son. 



Turritella altilira, n.sp., Gatun, Isthmus of Darien. 



T. Gatunensis, n.sp , Gatun. 



