336 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Ussuria, Fleiningites, Amhites, Kyniatites, Lecanites, 

 Prionolobus, Gyronites, Aspidites, Meekoceras, Clypites, 

 Ophtceras, Otoceras, and Medlicottia. The two latter gen- 

 era begin in the Permian, Aledlicottia becoming scarcer, and 

 Otoceras more abundant in the Lower Trias. It now seems 

 probable that the bed with Otoceras and Medlicottia may- 

 belong to the upper Permian. 



Jakiitic Stage. The Jakutic stage is most typically 

 developed in the Salt Range of India, where it comprises 

 the Ceratite sandstone. In the Himalayas it is represented 

 by the Subrobustus beds, with a fauna almost identical with 

 that of the Ceratite sandstones. In northern Siberia, where 

 it was first described, it consists of the lower black cal- 

 careous beds of Mengilaech near the mouth of the Olenek 

 River. In former publications the writer (32 and 33) 

 placed the Meekoceras beds of Idaho in the Jakutic stage ; 

 but further investigation in the field in both California and 

 Idaho make it probable that that they contain also a Brah- 

 manic fauna. 



In the upper part of the Werfen beds of the Mediter- 

 ranean region is found the equivalent of the Jakutic stage, 

 but the fauna is entirely distinct, the most characteristic 

 forms being Tirolites cassianus. Dinar ites dalmatianus, 

 Aspidites eurasiaticus, and Meekoceras ? caprilente. This 

 species has recently been described by A. Bittner(2) from 

 Darwas in Bokhara, in Central Asia; it therefore seems 

 possible that in Jakutic time a connection began to be estab- 

 lished between the Mediterranean and the Oriental regions. 



Characteristic genera of the Jakutic stage are Damibites, 

 Ceratites, Dinarites, Tirolites, Sibirites, Hedenstrcemia, 

 Lecanites, Aspidites, Meekoceras, Proptychites, Flemingites, 

 and Prosphingites. Of these, Lecanites and Plemingites 

 are not found in the Arctic-Pacific region at all. Heden- 

 strcemia mojsisovicsi Diener and Ceratites subrobustus 

 Mojsisovics are common to the Indian and the northern 

 Siberian provinces. 



During Brahmanic time there was a very intimate con- 

 nection of the Himalayan and Salt Range provinces of the 



