418 The American Naturalist. [May, 
sis, it is referred to a new genus, Sarcolestes, with the specific name 
leedsii. (Quart. Journ. Geol. Soc., 1893.) 
Crenozotc.—The British Museum has lately received an extinct 
skate from the Lower Tertiary Limestome near Cairo, Egypt. It is 
described by Mr. A. S. Woodward under the name Mylobatis pentonii. 
The specimen consists of the jaws, showing the dentition, which, accord- 
ing to the writer is the largest specimen of Mylisbotis dentition that 
has hitherto reached any museum. The maximum width of the disk 
of this extinct species is estimated at not less than five meters. (Pro- 
ceeds. Zool. Soc. London, 1893.) 
