THE GENERAL SUBJECT. 
Mamm. 3 
Clarke, W. E., & Roebuck, W. D. A Handbook of the Vertebrate 
Fauna of Yorkshire, being a Catalogue of British Mammals, Birds, 
Reptiles, Amphibians, and Fishes, showing what species are or have, 
within historical periods, been found in the county. London : 1881, 
pp. i.-xii. & 1-149. 
Of 72 species enumerated as still British, 50 occur in Yorkshire. 
Cope, E. D. On the origin of the Foot Structures of the Ungulates. 
Am. Nat. xv. pp. 269-273. 
. On the Effect of Impacts and Strains on the Feet of Mammalia. 
Am. Nat. xv. pp. 542-547. 
An interesting paper showing the influence of mechanical forces on the 
development of the various forms of Mammalian feet, specialized as 
regards (1) the reduction of the number of digits; (2) the formation of a 
second hinge-joint in the tarsus (in Artiodactylates) ; (3) the formation 
of trochlear ridges and keels on the articular ends of the bones. 
. The Bad Lands of the Wind River and their Fauna. Am. Nat. 
xiv. pp. 745-748. 
In this important paper [omitted accidentally from Zool. Rec. xvii.] 
notices are given of 19 species of fossil Mammals recently obtained from 
the “bad lands” of the upper part of the Big Horn River in Western 
Central Wyoming. 10 species are new, new genera being proposed for 
two of them. Some additional species are described, 1. c. p. 908. [See 
Lemuravido’, Vesper tilionidw, Erinaceidce, Leptictidce, Oxijcenidce^ Lophio~ 
dantidce^ Rhinocerotidcej Chalicotheriidoi.'] 
. On some Mammalia of the Lowest Eocene Beds of New Mexico. 
P. Am. Phil. Soc. xix. pp. 484-495. (Separately issued as “Palaeon- 
tological Bulletin, No. 33.”) 
Describes 12 new species, 8 of the genera being new, some of great 
interest. [See Leptictidce, Mesonychidos, Fhenacodontidce, Anoplotheriidce.'] 
. Contributions to the History of the Yertebrata of the Lower 
Eocene of Wyoming and New Mexico made during 1881. P. Am. 
Phil. Soc. XX. pp. 139-197. (“ Palasontological Bulletin, No. 34.”) 
Contains an account of the vertebrate fossils, chiefly Mammalia, from 
the Lower Eocene deposits of the Big Horn River district. Many of the 
forms found belong to new genera or species. [See Lemuravidce, Lim- 
noiheriidm, Miacidce, Leplictidce, Mesonychidce, Lophiodontidce, Corypho^ 
dontidce, Fhenacodontidce, Anoplotheriidce, Stylinodontidce.'] 
. Mammalia of the Lowest Eocene. Am. Nat. xv. pp. 829-831. 
Calls attention to some of the more characteristic Mammalia found in 
early Tertiary rocks, “ probably the Puerco formation,” which lies below 
the Wasatch, in New Mexico.” A new Creodont and 2 new “Suilloid” 
genera are described, though the two latter are later on (vide infra, p. 23) 
considered as probably belonging to the Fhenacodontidce. 
