PMlcations of the United States Government. 31 



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

 n.sp.; Stramonita petrosa, n.sp. 



From San Pedro: Tellina Pedroana, n.sp.; Tapes diversxim, n.sp.; 

 Saxicava abrupta, n.sp.; Petricola Pedroana, n.sp.; Schizothcerus Nut- 

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

 Fissurella crenulata, Sow.; Buccinum inter striatum f 



From Carmello : Lutraria Traskei, n.sp. 



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

 n sp.; Ostrea vespertina, n.SY).; 0. Heermanni, n.s^. ; Anodonta Calif or- 

 niensis, Lea. 



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



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



Appendix, Article IV. Letter from Prof. J. W. Bailey, 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. Xewberry. 

 (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 : 



Schizopyga Californiana, n.sp., Santa Clara, Cal. 



Cryptomya ovalis, n.sp., Monterey County. 



Thracia mactropsis, n.sp., Monterey County. 



Mya Montereyana, n.sp., Monterey County. 



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



Arcopagia medialis, n.sp., Monterey County. 



Tapes Hnteatum, n.sp., California. 



Area canalis, n.sp., Santa Barbara. 



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



A. congesla, California. 



Axincea Barbarensis, 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. 



Pallium estrellanum, n.sp., Estrella Valley. 



Janira bella, n.sp., Santa Barbara. 



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



Malea ringens; Dolium ringens (Cassis), Swainson. 



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



T. Gatiinensis, n.sp , Gatun. 



