LLOYD’S NATURAL HISTORY. 
w 
=J 
Ov 
GENUS PHASCOLOTHERIUM. 
Phascolotherium, Owen, Trans. Geol. Soc., ser. 2, vol. i., pt. i, 
p. 58 (1841); Lydekker, Cat. Foss. Mamm:, pt. vim 
270 (1887). 
This genus, as represented by P. dbuck/andi of the lower 
Jurassic rocks of Stonesfield, near Oxford, was one of the 
earliest discovered of the Secondary Marsupials, and is charac- 
terised by having only seven pairs of cheek-teeth (including 
premolars and molars). The molars had three cusps arranged 
in a longitudinal lin2, of which the middle one was much 
larger than the others, while there were minute accessory cusps 
at the two extremities of each tooth, and a distinct ledge at 
the base of the inner side. The whole length of the lower 
jaw was only about an inch, 
GENUS AMPHILESTES. 
Amphilestes, Owen, Encyclopedia Britannica, 8th ed., vol. 
XViil., p. 157 (1859); Lydekker, Cat. Foss. Mamm. Brit. 
Nus., pt ‘v., p- 271 (1657). 
In this genus, as represented by 4. broderipi, of the Stones- 
field rocks, the molar teeth were of the same general structure 
as in Phascolotherium, but much more numerous, the total 
number of teeth being probably the same as in the next genus. 
The one species was exceedingly minute. 
GENUS AMBLOTHERIUM. 
Amblotherium, Owen, Mesozoic Mamm., p. 2g (1871); Lydek- 
ker, Cat. Foss. Mamm. Brit. Mus., pt. v., p. 274 (1887). 
A second group of the family is represented by the minute 
Amblotherium soricinum, of the upper Jurassic Purbeck rocks 
