TiENTOPTERIS. 127 



forwards towards their extremity ; at the margin from 20 to 30 in 

 number per centimetre of length. 1 



This species is still imperfectly known. It would appear to be 

 essentially a Mesozoic type of frond, but some leaves associated 

 with the Glossopteris flora in India may be compared with those 

 occurring in the Rajmahal Series (Jurassic) of India. 



Of these, the earliest described was probably the frond which 

 M'Clelland 2 figured as T. acuminata in 1850. His description and 

 figure are, however, too imperfect to feel any confidence as to the 

 identity of the specimen with Oldham & Morris' species. The 

 Taniopteris figured by Bunbury 3 in 1861 (No. R. 10,367 in the 

 Mus. Geol. Soc. London) is probably identical with Feistmantel's 

 Lower Gondwana specimens from the Raniganj Group. They are 

 linear, fairly narrow leaves, the lateral veins being simple, or more 

 often dichotomised close to the point of origin with the midrib. 

 The nerves are not very crowded. They are small imperfect 

 fragments from Kamtlii in the Nagpur district, and are no doubt 

 identical with some specimens in the British Museum described 

 here from the same locality. 



"While admitting that the fronds under discussion show consider- 

 able resemblance to the Mesozoic frond Tceniopteris IP Clellandi 

 (Oldham & Morris), it does not seem possible to me to correlate 

 them with this species with any confidence, partly on account of 

 the fragmentary nature of specimens so far discovered, and partly 

 because of the great difference in the age of the two deposits. 

 Until better examples have been obtained, they may be referred 

 to provisionally as Tceniopteris cf. J/' Clellandi. 



reistmantel 4 has also distinguished, undei'thename Ancftopteridium 

 infarctum, some fronds which recall Bunbury's specimens in size 

 and nervation. They differ, however, in the veins being very 

 approximate, and passing out from the midrib at a more acute 

 angle. Both Feistmantel's figures are of apical portions, and this 

 may in part account for the acuteness of the lateral nerves, which 

 in fronds of this type are often less oblique towards the apex. 



1 See Zeiller (02 : »), pp. 61, 62. 



- M'Clelland (o0), p. 53, pi. xvi, fig. 2. 



:i Bunbury (61), p. 332, pi. x, fig. 2. 



1 Feisfcmantel (SO), p. 93, pi. xxxivA, fii 



