254 The American Geologist. April, 1892 
w. Osborn, H. F.—On the Molars of the Perissodactyla. 
Review of No. 43 (Am. Geol., 7, p. 236, 1891; also vide No. y of 
this catalogue) by Mr. Lydekker. Geol. Mag., III, 8. July, pp. 
317 321. 
50. Osborn, H. F.—Some Characteristics of the Primitive 
Vertebrate Brain. Amer. Morph. Soc., Boston, Dec. 30, 1890- 
51. Panton, J. H.—The Mastodon and Mammoth in Onta- 
rio, Canada. Abstract inGeol. Mag., III, 8, Nov., p. 504. 
o2. Safford, J. M.—Exhibition of certain bones of Megal- 
onyx, not before known. <A. A. A. 8., 1891. Abstract in Am. 
Geol. 8, Octo. p. 232, also note /d, Sept.. p. 193. 
03. Safford, J. M.—The Pelvis of the Megalonyx and the 
lot of undescribed Bones, among which it is found from Big 
Bone Cave in Tennessee. Geol. Soc. Am. Aug., 1891. 
54. Seott, W. B.—On the Osteology of Mesohippus and 
Leptomeryx, with Observations on the Modes and Factors of 
Evolution in the Mammalia. Jour. Morph. v, No. 3, Dee., pp. 
301-406; ill. Issued Jan. 30, 1892. 
oD. Scott, W. B.—On the Osteology of Pcebrotherium, A 
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June, pp. 1-78; ill. 
x. Seott, W. B.—On the Osteology of Pceebrotherium. Re- 
view in Am. Geol. 8, Nov, p. 327. 
06. Seott, W. B.—The Princeton Scientific Expedition of 
1891. Princeton College Bull., 1891, 4 pp. part geology. 
y. Seott, W. B. and Osborn, H. F.—Preliminary account 
of the fossil mammals from the White River and Loup Fork 
formations, contained in oe Museum of Comparative Zoology. 
Vide No. 43 (Am. Geol. 7, p. 236, 1891). Review in Am. Geol. 
7, Feb., pp. 134-135. 
D7. Shufeldt, R. W.—A Study of the fossil Avifauna of the 
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D8. Shufeldt, R. W.—Fossil Birds from the Equus Beds of 
Oregon. Am. Nat. 25, Sept., pp. 818-821. Describing fourteen 
new species. 
z. Shufeldt, R. W.—Ona Collection of Fossil Birds from the 
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aa. Shufeldt, R. W.—On a Collection of Fossil Birds from 
the Equus Beds of Oregon. Am. Nat. 25, April, pp. 359-362 
