Fossil Freshwater MoUusks. from Oreg.cn 



closest relative of the species is Lanx undulate (Meek)' described 

 from the Kaw-Sow Mountains, Nevada. That species, however, 

 has distinct undulations on the posterior slope and the anterior 

 slope is more decidedly concave. In, the series of specimens of 

 moribundus the shape is found to be decidedly variable in outline 

 but the height of the shell is more constant. It was also found at 

 localities 209 and 219, both in the vicinity of Warner Lake. 



LANX NUTTALLII (HALDEMAN) ? 

 Plate 1, figure 7 



Ancylus (Velletea) nuttallii Haldeman, Monog. Freshwater Univalve 

 Shells, pt. 3, p. 3, inside of back cover, 1842. Oregon DeKay, New York Moll., 

 p. 13, 1843. 



Acroloxus nuttallii Hald. Binney, Smith. Misc. Coll. No. 143, p. 147, 

 1865. Original description repeated. Cooper, Proc. Calif. Acad. Sci. Vol. 4, 

 p. 100, 1870. Brief description, no localities. Cooper, Proc. Calif. Acad. Sei. 

 Vol. 4, p. 174, 1972. Snake River, Washington, one-half inch long, sinistral 

 apex. Alameda County, [California?] 



Ancylus nuttalli Hald. Carpenter, Smith. Misc. Coll. 252, p. 85, 1872. 

 A note by J. G. Cooper states that this is questionably equal to A. caurinus 

 (Wm. Cooper (nomen nudum) of the Pac. Bail. E. Eep. Vol. 12, pt. 2, p. 378, 

 1860. J. G. Cooper later (Proc. Calif. Acad. Sci. 2nd ser. Vol. 3, pp. 70-91, 

 1890) considered caurinus distinct and Dall (Harriman Alaska Exp. Vol. 13, 

 1905) doubtfully referred it to A. fragilis, so the above note in Carpenter's 

 report may safely be ignored. 



Acroloxus nuttalli Hald. Carpenter, Smith. Misc. Coll. No. 252, p. 161, 

 1872. Oregon. Copy of Binney 's record, Syn. Air Breath. Moll, of N. A., 

 Smith. Inst. No. Ill, Dec. 9, 1863. 



Lanx nuttalli (Haldeman), Hannibal, Proc. Mai. Soc. London, Vol. 10, 

 p. 149, 1912. Brief description. Listed from Columbia Eiver and tributaries. 

 Following are listed as synonyms: crassus Haldeman; kooteniensis Baird; 

 subrotundatus Tryon. 



Lanx nuttallii (Haldeman), Walker, Univ. Mich. Misc. Pub. No. 6, p. 117, 

 1918. Citations of Binney and Haldeman as above. 



The identification of the fossil shell from Warner Lake beds, 

 University of Oregon locality 212, with this species has necessarily 

 been made with some doubt. A: nuttallii has never been figured, 

 apparently, and no description of more than three lines has been 

 seen. Of course for identification purposes we have little more 

 than a nude name. If the fossil were perfect, Haldeman 's name 

 would be ignored as unrecognizable but, as the figure on Plate 1 

 shows, our shell is decidedly too imperfect to serve as a type speci- 

 men. The apex and part of the margin are missing. 



GENUS: PALUDESTRINA D'ORBIGNY 

 PALUDESTRINA MICROCOCCUS (PILSBRY) 



Plate 4, figure 5 



Amnicola micrococcus Pilsbry, in Stearns, North Am. Fauna No. 7, p. 

 277, fig. 1, 1893. Oasis Valley, Nevada. Death Valley, California. Pilsbry, 



5 Meek, F. B. Proc. Acad. Nat. Sci. Phila., 1870, p. 57. Geol. Exp. 40th Parallel, Vol. 

 *. p. 186, pi. 17, figs. 12 a-b, 1877. 



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