Charles Earle—Evolution of the American Tapir. ool 
(Fig. 1la.), giving a sharp-lanceolate edge view (Fig. 11b.). In 
this case Cytherideis gracilis (Reuss) and C. botellina (Jones) are 
among its nearest allies; but neither of them matches it exactly. 
I propose to name it C. equalis. 
From the Bear-River Formation ; Cokeville, S.-W. Wyoming. 
15. CYTHERIDEIS IMPRESSA, sp. nov. Pl. XV. Figs. 12a, b. 
Length -6, height -25, thickness 17 mm. 
A narrow and curved carapace of nearly equal thickness throughout 
except where constricted with a broad and shallow impression in 
the middle of the ventral region. 
From the Bear-River Formation ; Cokeville, 8.-W. Wyoming. 
EXPLANATION OF PLATE XY. 
All the figures magnified 20 diameters. 
Fic. 1. Metacypris consobrina, sp. nov.; a, carapace, left valve shown; 8, edge 
view; ¢, end view. 
», 2 ———— subcordata, sp. noy.; a, left valve shown; 6, edge view; 
ce, end view. 
3 cuneiformis, sp. nov.; @, right valve shown; 0, edge view; 
é, end view. 
», 4. Cytheridea truncata, sp. noy.; 4, left valve shown; 8, ventral edge. 
5. Cypridea tuberculata (Sow.), var. Wyomingensis, nov.; a, right valve 
shown ; 6, ventral edge. 
. The same; a, left valve shown; 3, ventral edge. 
. Cytheridea tenuis, sp. nov.; a, left valve shown; 6, edge view. 
. Potamocypris afinis, sp. nov.; a, right valve shown; 34, ventral edge. 
. Metacypris simplex, sp. nov.; a, right valve shown; 0, edge view; 
¢é, end view. 
», 10. Potamocypris unisuleata, Jones; a, left valve; 6, edge view. 
», Ll. Cytherideis equalis, sp. nov.; a, carapace, left valve shown; 4, edge view. 
», 12. ———— impressa, sp. nov.; a, right valve shown; 36, edge view. 
», 13. Cythere monticula, sp. nov.; a, left valve shown; 4, ventral view. 
», 14. Candona subreniformis, sp. nov.; a, right valve; 4, edge view. 
», 15. Cypris Purbeckensis, K. Forbes; a, carapace, right valve shown; 4, edgeview. 
», 16. Candona subovata, sp. nov.; a, right valve shown; 4, edge view. 
I1.—Tux Evocurion oF THE AMERICAN TAPIR. 
By Cuartzs Harz, B.S8c., 
of the American Museum of Natural History, New York. 
HE genus Tapirus of all the recent Ungulata, is the most dis- 
continuous in its distribution over the THarth’s surface. 
Wallace, in his great work on the “Geographical distribution of 
Animals,” in referring to extinct Tapirs, remarks: “the singular 
distribution of the living species is thus explained, since we see 
that they are an old world group, which only entered the 
American continent at a comparatively recent epoch.” He reaches 
this conclusion by the fact that at the time his work was written 
(1876) the only known remains of the Tapiride in America were 
from the Post-Pliocene deposits. 
Our knowledge has been greatly increased as regards fossil tapirs 
in America within the past few years, and the discovery of the genus 
Protapirus of Filhol, by the expedition sent out by the American 
Museum of Natural History in the Lower Miocene of Western 
Dakota, has added another very important link in the phylogeny of 
