236 Serentifie Intelligence. 
dolerite, called basalt and anamesite, the chrysolitic kind or peri- 
dotite, and the chloritic kind called diabase; and, in alternations 
been analyzed: the porphyritic dolerite afforded 49 per cent of 
silica; the anamesite, 44 per cent; the diabase, 51 per cent; the 
green trachyte, 72 per cent. Dr. Blake concludes from the facts 
that the views of Richthofen with regard to the relative ages of 
the different kinds of eruptive rocks will not apply to those of the 
Puebla Mountains. 
4. Bulletin of the United States Geological and Geographical 
hs D ment of the Interior. No. L 
e Lemurs 
Phoneus (Macherodus) oreodontis Cope, Poébrotherium Hallit 
Leidy, P. Wilsonii Leidy; species of Mypisodus, Hypertragulus, 
eptom _ Elotherium and Symborodon, Cope announces that 
the Pliocene camels of the Rocky Mountain region had a full set 
of ere incisors. 
e have received the following from Dr, Hayden with regard 
to Bulletin No. 2, which will soon be issued: This number con- 
tains a long article by Prof. Cope on the relation of the Cretaceous 
