232 T/ieAiiiiri(((ii (irohxjiM . octubfi-, iH'.n 
Kquus beds of vvostoni Texas, with which stono implements art- 
also found, embedded in the same stratum. This skull was 
broken in upon the forehead, as if Ity a rounded stone used as a 
Aveapon : and it was .suggested that the prehistoric extinction of 
the genus Ecjuus on this continent, as also of other large Pleis- 
tocene animals, may have resulted from their chase and slaughter 
for food by the contemporaneous savage tri])es of men. 
K.rlilltltion of certain hoiios <>/ M( (/(iloityj: not before kiioiru. 
By Ja.me-s M. Saffori). The bones were recently found em- 
bedded in earth on the floor of. Big Bone cave, in eastern Tenne- 
see. They include the pelvis, and supplement the collection of 
3Iegalonyx bones long ago found in the same cave and described 
b}' Leidy. It is therefore likely that the two collections represent 
the same individual. The lateness of extinction of this animal 
is indicated by portions of tlie cartilage of the joints still adher- 
ing to the bones. 
Prof. Vj. D. Cope, in discussion, stated that Megalonyx appears 
to have been an exclusively North American genus. 
On the YtrohahJe existence of a second driftJess aren in the Mis- 
sippi basin. By R. D. Salisbury. This area lies in the space 
between the Mississippi and the Illinois river near the mouth of 
the latter stream, and is comprised in Calhoun county and the 
southern part of Pike county, Illinois. Its extent is perhaps 500 
square miles. Hundreds of good sections observed on the high 
summit i)lain of this area and at heads of its ravines show no 
glacial drift or till. On its borders the drift is attenuated, like 
the tracts of the earh' drift sheet bordering the Wisconsin drift- 
less area. The topographic features of castellated rock clitls and 
pinnacles are similar in l)oth these areas. The surface of this 
smalU'i- diiftless area is mostly loess, from 15 to 50 or fio feet in 
thickness; and this is often seen to rest conformably on a gravel 
and sand deposit, which may be the representative of the La- 
fayette formation or Orange Sands. 
The Cincinnati ice dam. By Frank Lkvkrett. Examination 
of the Ohio valley during this summer shows that fine silt over- 
lies the till along the valley l)oth above and below Cinciiniati. 
This silt constitutes a continuous formation, and must l)e 
ascribed to deposition during a time of very gentle drainage sub- 
sequent to the retreat of the ice-sheet from its extreme limit, 
which crosses the Ohio v'ww into Kentuckv as traced bv l*rof. G. 
