126 REVIEWS 
The trains of fluvio-glacial alluvium and erratic blocks into which the 
moraines pass, cross the deep cut in which the Dordogne flows and 
reach the hills of Limousin. The phenomena are not to be explained 
by individual glaciers, but imply the existence of a true ice-cap cover- 
ing the entire region. The formations here described are only to be 
seen on the plateaux overlooking the valleys for 100 to 300 meters. 
After the erosion of these plateaux during an interglacial epoch, the 
valleys were occupied by local glaciers. The quaternary age of the 
moraines formed by these is demonstrated by fossils of various kinds. 
The glacial formations of the plateaux are referred to the upper Pliocene 
by a comparison with the phenomena of adjacent regions. 
la Os C.. 
Neocene Mollusca of Texas, or Fossils from the Deep Well at Galveston. 
By G. D. Harris. Bulletins of American Paleontology, No. 3. 
This bulletin is a condensation of a portion of the Monograph of 
the Marine Tertiary Mollusca of Texas, prepared by Professor Harris 
but as yet unpublished owing to the lack of funds of the Geological 
Survey of Texas. 
The material described in the bulletin is unique, for up to this 
date no other marine Neocene fossils are known from the gulf slope 
west of Mississippi. , Seventy-five species and varieties, twenty-three of 
which are new, distributed among forty-seven genera, are noted or 
described in the paper, which is illustrated by four plates. 
S. W. 
