450 . The American Naturalist. [May, 
and heat loving spotted hyenas have gnawed the fresh bones of the 
arctic reindeer. 
Puzzles like these may be finally explained by the study of such 
superposed plistocene layers as those of Abbeville, which, according to 
M. G. d’Ault du Mesnil, indicate that the fauna grew newer anda 
warm climate became colder as we approach the latest bed, as follows: 
SOMME GRAVELS, ABBEVILLE. 
(a) UPPER TERRACE (oldest). 
Elephas antiquus, E. primigenius, Rhinoceros merkii, R. tichorinus, 
Hippopotamus major, Ursus speleus, Cervus megacerus, Hyena spelea, 
Macherodus cultridens, Trogontherium cuvieri, Equus caballus, Bos 
primigenius. 
(b) MIDDLE TERRACE. 
Elephas antiquus (declining), E. primigenius, R. tichorninus (increas- 
ing), Equus caballus, Cervus elaphus, Bison priscus, Rhinocerus merkit 
(declining), Hippopotamus major, Ursus speleæus, Oervus megaceros, 
Hyena spelea, Macherodus cultridens, Trogontherium cuvieri, Equus 
caballus, Bos primigenius. 
(c) Lower Terrace (latest). 
Elephas primigenius, Equus caballus (dominant), Rhinocerus ticho- 
rinus (numerous), Reindeer, Cervus elephus, Cervus tarandus, Bos 
primigenius, Ursus (not determined) and Cyrena fluminalis. 
Turning to the associated human remains, in Prof. Dawkins’ first 
period, cave runs into cave and rock shelter into Drift so unclassifiably 
_ that we had better, he thinks, stop subdividing the epoch into 
Mousterian, Solutrian and Magdalenian, and call it all by one na™® 
Paleolithic. 
(period a) Drift Specimens was enough to call a halt to the 
gatherer and the labeller by type and, we might add, clear the 
rs E ENEE a E I E I EE A EET A 
