MHSCHETJCALK OF SPITI AND PATNICHANIM. 
68 
Monoph/llites Hara Dien. 
,, A'mf/( Dieii. 
Twelve species are peculiar to Spiti, namely : — 
Ceratites (floUandifes) Vyasa Dien. 
,, (Banuhites) cf. Kansa Dien. 
Keyserlingites Pahari Dien. 
„ pagoda Dien. 
„ sp. ind. aff. Bungei Mojs. 
Japonites cf. Ugra Dien. 
Staclieites Webbianus Dien. 
Sihirites Prahlada Dien. 
Gymnites depauperatus Dien. 
,, sp. ind. aff. Sanl'ara Dien. 
Monophyllites (Mojsvantes) Conjucii Dien. 
,, ,, Pradyumna Dien. 
Only two species of Nautiloidea which appear in A. v. Krafft's 
collections from the Shalshal cliff have not as yet been noticed in the 
Lower Muschelkalk of Spiti. Those species are : — 
Orthoceras cf. multilabiatum Hauer. 
„ cf. campanile Mojs.^ 
The most characteristic element in this fauna is the group of Keyser- 
lingites Dieneri {Ceratites suhrobusti). 
The Himalayan representatives of this group are not identical with 
those from the Olenek beds of Siberia. It might even be questioned 
whether they should actually be included in the genus (or subgenus) 
Keyserlingites. They serve indeed to illustrate one of the most interest- 
ing cases of convergence. Full grown individuals of Keyserlingites Dieneri 
agree so closely with the Siberian Keyserlingites subrobustus Mojs. in 
all their external characters, that their examination did not lead to the 
discovery of any features which might justify a specific separation. It 
was only the examination of inner nuclei — not known before 1905 — 
which showed the larval and adolescent stages to differ remarkably from 
the corresponding stages in Keys, subrobustus. Whereas inner nuclei 
of the latter species resemble mature stages of Dinarites (Olenekites) 
' All the species quoted in this list have been described and illustrated in 
Diener, Fauna of the Himalayan Muschelkalk, Pnl, Ind., ser. XV, Vol. V, Pt. 2. 
{ 264- ) 
