64 
DIENER : TRIAS OP THE HIMALAYAS. 
spinipUcaius, its Indian representative passes through stages resembling 
Tirolites and afterwards Sibirites. 
There is consequently no real affinity between the Indian and 
Siberian types corresponding to their astonishing resemblance in exter- 
nal shape, sculpture and sutures. A new subgeneric denomination, 
Durgaites, might be proposed for the Himalayan forms. 
' The Upper Muschelkalk (No. 4) is a cephalopod-facies, in which very 
few remains of Brachiopoda, Gastropoda and Lamellihranchiata are 
associated with a large number of ammonites. The following species of 
Brachiopoda certainly belong to the Upper Muschelkalk of Spiti : — 
Coenothyris vulgaris Schloth. 
Mentzelia Mentzelii Dunk. 
koeveskalliensis Suess. 
The following species of Gastropoda and Lamellihranchiata must be 
added to this list : — 
Pleurotomaria indica Blaschke. 
Worthenia Dieneri Blaschke. 
Tectospira gracilis Blaschke. 
Omphaloptycha sp. ind. 
Pseudomelania sp. ind. 
Cardiomorpha (?) Haydeni Dien. 
Lima sp. ind. aff. lineata Desh. 
Posidonomya sp. ind. aff. pannonica Mojs. 
The differences between the cephalopod faunae of Spiti and of Pain- 
khanda are of small importance. In both areas the fauna of the Upper 
Muschelkalk is richer in species than that of any other Triassic horizon. 
Not less than 23 species of Cephalopoda are common to the two dis- 
tricts, among them all the important leading fossils of this horizon. 
These species are : — 
Ceratites Thuilleri 0pp. 
„ Kamadeva Dien. 
,, {Hollandites) Voiti 0pp. 
„ ,, Ravana Dien. 
„ „ Airavala Dien. 
„ „ Visvakarma Dien. 
„ „ Dungara Dien. 
( 2G5 ) 
