BIBLIOGR. APPENDIX—G. PERISSODACTYLA. 1035 
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Leidy, J. [On Rhinoceros occidentalis. ] < Proce. Acad. Nat. Sci. Phila. v, 1850, p. 119. 
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Leidy, J. [Onsome fragments of Palwotherium proutii.] < Proce. Acad. Nat. Sci. Phila. v, 1851, 
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Leidy, J. [On two species of fossil rhineceros from Nebraska.] < Proc. Acad. Nat. Sci. Phila. 
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[Kefers R. nebrascensis and R. occidentalis to Acerotherium.] 
1852.—Hays, I. [Remarks on a tooth of a fossil tapir from North Carolina.] < Proc. Acad. Nat. Sci. 
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Leidy, J. [Remarks on some fossil teeth of rhinoceros—R. americanus—from Nebraska. ] 
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1853.—Joly, N., and Lavocat, A. Etudes anatomiques sur une mule fissipéde aux pieds antérieurs. 
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1863.—Ritimeyer, L. Beitriige zur Kenntniss der fossilen Pferde und zur vergleichenden Odonto- 
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Gill, T. [Communication respecting a new generic type of the family Tapirida--Elasmogna- 
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1866.—Swallow, G. C. Notice of remains of the horse in the altered drift of Kansas. < Trans. Acad. 
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