CORRELATION OF THE MIDDLE TRIAS. 
79 
Jafonites cf. Dieneri Mart. 
Acrochordiceras cf. Carolinoe Mojs. 
Sturia Sansovinii Mojs. 
Gymniies incultus Beyr. 
„ cj. Humboldti Mojs. 
Anagymnites cf. acuius Hauer. 
Ptychites Everesti 0pp.' 
Proarcestes Balfouri 0pp. ( — Escheri Mojs). 
Joannites cf. proavus Dien. 
Monofhyllites sphcerophyllus Hau. 
The close affinity of a considerable number of other species is 
scarcely less remarkable. The genus Ptychites, which plays a very im- 
portant part both in the Upper Muschelkalk of the Alps and of the 
Himalayas, especially in number of individuals, is represented in both 
regions by many ' vicarious ' types. The Himalayan species of Pleuro- 
nautilus are all nearly allied to others from the Reiflingerkalk of the 
North-eastern Alps. Among the Ceratites tlu:ee species, Cerafites 
Thuillieri 0pp., C. himalayanus Blfd., C. sp. ind. aff. Abichi Mojs. 
exhibit close relations to congeneric forms of the nodosi group. The 
subgenera Halilucites, especially characteristic of the Bosnian Muschel- 
kalk, and Cuccoceras are also represented in India, each by a single 
form nearly allied to European ones. 
On the other hand there remains a sufficient number of peculiar 
faunistic elements, which impart to the Indian Triassic province the 
character of a zoo-geographical region of its own. 
The most important of those elements pecuhar to the Muschelkalk 
fauna of the Indian Trias are several subgenera of Ceratites, which 
predominate in the Upper Muschelkalk of the Himalayas. The section 
of Ceratites circumplicati (HoUandites), which is very poorly developed in 
the Mediterranean region, is the most remarkable group of Indian cera- 
tites, being represented there by fifteen species. Those species of HoUan- 
dites show but very remote affinities with the Alpine representatives of 
this subgenus. Three species of Ceratites differ from all European types 
1 In the fauna of the SchiechHnghoehe near Hallstatt this species is represented 
by a form very closely allied or perhaps even identical with it, although its frag- 
mentary state of preservation did not allow any definite judgment. Vide C. Diener, 
Die Cephalopodenfauna der Schiechlinghcehe, Beitrcege zur Palaiont. und Geo., 
Oesierr. Ungarns. etc., XIII, p. 32. 
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