44 University of Texas Bulletin 



but as J. P. Smith thinks, may be found in the Prolecanitidae. These 

 genera suggest at once the conclusion that the strata in which they are 

 found imbedded must belong to a higher division of the Permian and 

 certainly not to the Permo-Carboniferous whore similar forms are en- 

 tirely unknown. This conclusion is confirmed by the circumstance 

 that at Chitichun I in the Himalayas, Xenaspis carhonaria has been 

 found together with Krafftoceras, a near relative of Cyclolobus or 

 possibly a subgenus of the latter group. The form has a much more 

 highly developed suture than even Waagenoceras or Perrinites, and 

 Diener has very justly sustained the opinion that Chitichun I and the 

 upper portion of the middle Productus limestone are of the same age 

 and that they are certainly younger than the Permo-Carboniferous. 



The upper portion of the middle Productus limestone contains also 

 Medlicottia 'primas. This species has also been found in the upper 

 Productus limestone in the zone of Episageceras Wynnei (Chideru 

 group). But the fossil which is most characteristic for the upper 

 Productus limestone is Cyclolobus Oldhami. The genus Cyclolohiis 

 has a much more highly developed sutural line than any of those de- 

 scribed until now from the Permo-Carboniferous, and certainly in- 

 dicates that the strata in which it occurs are younger than the Artinsk 

 or the Sosio beds. Cyclolobus and its near relative Krafftoceras have 

 been found by Diener in the Kuling shales of Spiti (Himalaya). 

 Cyclolobus has also been described by Rothpletz from the Permian 

 strata of Ajer Mati near Kupang on Timor {Cyclolobus persulcatus) . 



Wanner^ has made known another locality where Cyclolobus exists 

 on Timor. In a collection made by Lieutenant v. Grube, Wanner found 

 a number of species described from the Ajer Mati and among them the 

 Cyclolobus. But possibly there exist different horizons in the col- 

 lection ; it contains at least two species of Medlicottia, one of which has 

 been determined as M. magnotuberculata Tchernow, a very character- 

 istic form from the Artinsk. Possibly the whole series from the Ar- 

 tinsk to the Permian may be developed in that place and it may very 

 well be possible that the true relations between the Artinsk, Sosio 

 beds and upper Productus limestone can be ascertained in that region 

 of Timor. 



V. Wanner, Perm-, Trias-, und Jura-Formation des indo-australischen Archipel, p. 737. 



