THE CAMBRIAN FAUNA OK INDIA 



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zvarlhi Waagen and Lakliniina liiigiiloidcii Waagen all indicate 

 a stage of development more advanced than that of the brachi- 

 opods of the Cambrian faunas in other parts of the world. 

 Wynnia zuarthi Waagen is the onl}'- articulate brachiopod in 

 the collection ; it is related to both Nisusia and DillitigscUa of 

 the Lower and Middle Cambrian faunas. 



Plcropoda : The fragments representing Hyolilhcs Jciissahcn- 

 sis Waagen is undistinguishable from young shells of Hyolilhcs 

 ■priinordialis Hall and H. americanus Billings. A similar, 

 if not identical, species occurs with Rcdltchia [Ilceferta) ncetlingt 

 in Division V. Hyolilhcs wynnci Waagen is clearly distin- 

 guished by the median furrow on the ventral side from other spe- 

 cies of the genus. It occurs in Divisions II and III. Pseudo- 

 theca ivaagcui Redlich is one of the doubtful forms which has 

 little stratigraphic value. Its relations appear to be with Stcno- 

 theca. 



Trilobita: Reference has already been made to Rcdlichia 

 ncellingi Redlich when speaking of the stratigraphic position 

 of the genus. The genus occurs in China in the basal fossilif- 

 erous beds, but it is not far below the characteristic Middle 

 Cambrian fauna. As has been stated, I regard the genus as of 

 late Lower Cambrian or early Middle Cambrian age. Ptycho- 

 ■paria richtcri Redlich from the Magnesian limestone series 

 is a form that might well occur at any horizon of the Cambrian 

 although it is more of a Middle Cambrian type. The same 

 may be said of Ply chof aria zvarlhi from Division III. A frag- 

 ment of the central portions of the head of a trilobite from Divi- 

 sion III, was named Olcnns indices by Waagen. The pustulose 

 surface and strong, rounded glabella indicate a species more 

 nearly related to Conocoryfhc trilincatus Emmons of the Lower 

 Cambrian fauna than Olenus of the Upper Cambrian fauna. 

 The fragment is hardly sufficient to base a generic or specific 

 determination upon. The stratigraphic horizon of this species 

 is in doubt. It probably came from Division IV, as the asso- 

 ciated Hyolilhcs kiissakcnsis is abundant in the superjacent 

 shales of Division V. 



As stated by Dr. Redlich, the composition of the fauna is very 

 simple. In Division IV there is an unusually remarkable de- 



