| S ep tember, F 4 
The following table exhibits the distribution in time of the | 
species of the suborder Condylarthra: | 
906 Editors’ Table. 
PERIPTYCHIDA. 
Puerco ep. Wasatch ep, 
SNE ETR AE ase skein ecw di e.0s cook saaa] I 
E A i o E eve auras I 
Periptychus LEN 3 
Hemithlæus ...... E TEE W Primate. (ae KAA 2 
Anisonchus.,... ADEE e he toh ee i es ste teen 5 
Hinploctaus i dik dia. 4 ] 
e R Rp a ae I Nea 
PHENACODONTID&. 
Ro A EA E a eins cd I 
Protogonia Gorice oe... . 2 
a E N .ouN 2 7 
a T I E icc ccc I D 
MENISCOTHERIIDÆ. 
Meniscotherium ,.... ined l 3 bo 
33 
: EXPLANATION OF PLATES. 
PLATE XXVIII. \ 
Skull of Phenacodus primevus, from specimen figured in Plate XXIX, -E 
nat, size. Fig. a, right side of skull; 4, top of skull; e, right mandi 
ramus from above. 
PLATE XXIX. 
Skeleton of Phenacodus primævus, one-seventh nat. size; found by Mr. e 
man, mounted by Mr. J. Geismar. From the Wasatch beds 1883 
Horn river, Wyoming. (This plate was published in the ae 
PLATE XXX. | 
_ J. Le Wot 
Skeleton of Phenacodus vortmani, two-ninths nat. size, found by Mr J ‘santed by 
man in the Wasatch beds of the Big Horn river, Wyoming, and m 
r. J. Geismar. Mus, Cope. Fig. a, manubrium sterni. 
—o:— 
EDITORS TABLE. 
EDITORS: A. S. PACKARD, JR., AND E. D. COPE. 
The use of trinomial nomenclature in biology has ge | 
revived in the United States during the last ten years, 
adoption has been easy because it supplies a want. : 
are often very recognizable, as are in fact species which inosch : 
late with other species at the present time, so as to be ins Ei 
by definition. For the recognition of such forms the trino™ 
nomenclature is indispensable, 
All the innovations in nomenclature from this side the wate! 
