1881.] fossils of the Indian Gondwdna system. 213 



Trigonia* Smeei,\ Sow. 

 1841. Trans. Geol. Soc. Lond., Vol. V, pp. 715, 716, PI. LXI, fig. 5. 

 Upper Gondwanas : Urmia group at Bururia and other places in Kach ; 

 and at lnnaparazpolliam, about 30 miles North West of Coconada. 



Trigonia ventricosa,% Kraus. 



1850. Kraus N. Act. Acad. Leop. Car., Vol. XXII, Pt. 2, pp. 456-458, PI. 49, 

 fig. 2. 



1879. Manual Geology of India, p. 261, fig. 



Upper Gondwdnas r Umia group same localities. 



There are other bivalves figured and described by Sowerby (/. c), from 

 Kach, but it is not necessary to enumerate them here, as all the bivalves as 

 well as the Gasteropda (of which there are however not many) have still 

 to be properly worked out and described. 



Cephalopoda. § 



The Cephalopoda of the Jurassic rocks of Kach have already been 

 figured and described in Ser. IX of the Palseontologia indica, and I shall 

 therefore not quote them here. 



I mention this order only on account of one form of Ammonites, which 

 is common to the shales at Eaguvapuram (South Godavri district) the 

 shales at Vemaveram and other places (South Kistna district) and the 

 Sripermatur area, and helps to correlate the beds of these three areas. 



VERTEBRATA.H 



Pisces. 

 Remains of fishes are not uncommon in the upper Gondwanas, while 

 in the lower Gondwanas they are extremely rare. 



Ganoid fishes. 



The only remains of fishes in the lower Gondwanas are scales of 

 ganoid fishes. They were first mentioned by the late Rev. Mr. Hislop.^" 

 One or two speeimens are amongst the collections of the Geological Survey 

 of India. 



In the upper Gondwanas fishes are more numerous ; they were partly 

 described in the Quart. Journ. Geol. Soc. London, and partly only recently 

 in the Palaeontologia Indica. 



* Treis (gr.) = three ; gonia (gr.) = angle = the triangled shell. 

 f Proper name. 



\ Ventricosus (lat.) = blown up. 

 § Kephale (gr.) = the head ; pous (gr.) = the foot. 

 || Vertebra = a backbone. 



IT Quar. Jour. Geolog. Soc. Lond., Vol. XVII, p. 347. 

 28 



