li 



E. Lydekker— .1 Sketch of the 



[No. 1, 



have a united range in Europe from tLe Lias to the Eocene : Lepidotus is very 

 characteristic of the VVealdeu of England. Of the Maleri Dipnoi, teeth of four 

 S2)eeies of the living Queensland genus Oeratodm were named by the late 

 Dr, Oldham, three of which have lately been figured by Professor Miall,* 

 who does not admit the fourth species, O. ohlongus. 



Cretaceous. — A. few fish-remains have been obtained from the Lameta 

 rocks (of middle Cretaceous age), but are not yet determined. The next group 

 of rocks in which fish-remains have been obtained are the upper and middle 

 Cretaceous rocks of Trichinopoli ; these remains have been described by the 

 late Dr. Stoliczkaf and Sir Philip Egerton.J They comprehend seventeen 

 sj^ecies of elas.nobranchs, ranged under the genera Gorax, Mtchodm, Lamna, 

 Odontaspis, Otodus, Oxyrhiiia, Ptychodus, and Sphcerodus, and one ganoid 

 doubtfully referred to Fycnodus. No Teleostei have been described, which is 

 very probably owing to the less facility with which their remains are pre- 

 served ; it being almost certain that they must have been represented in the 

 Indian Cretaceous seas. The above-named genera are mainlj^ characteristic of 

 the Cretaceous rocks of Europe : two species are common to Europe and 

 India. Bones, apparently of fishes, have been lately obtained by Mr. Gries- 

 bach from the Trias of Tibet. Mr. Griesbaeh tells me that these bones 

 are not uncommon in the Trias limestone, but that he has not yet been 

 able to extract any specimens in a determinable condition. 



Eocene. — From the probably Nummulitic rocks of Port Blair, in the 

 Andamans, and Eamri Island, off the Arakan coast, there have been obtain- 

 ed the oral teeth of a large species of Diodon, which I have lately 23rovi- 

 sionally called Diodon foleyi, after Captain Foley, the discoverer of the 

 Eamri Island specimen. § The living Diodon liystrix is now abundant off 

 the coasts of the Andamans and Arakan, where the genus has doubtless 

 lived since the Eocene. From Nummulitic rocks in the neighbourhood of 

 Thyatmyo, cycloid fish-scales have been obtained, || but are not generically 

 determined. 



From the Nummulitics of the Punjab, some fish-scales and the dental 

 plate of a species of ray (Myliohatis) have been obtained by Mr. Wynne. ^ 

 From strata immediately overlying the Nummulitics of Kohat, Mr. Wynne 

 has obtained the incisor of a sparoid fish belonging to the genus Gapitodus, 

 Avhich has been recently described by myself as G. indicus ;** the genus 



* Palreontologia Indica, Ser. IV, part 2. 



t Ibid., Cretaceous Fauna of S. India, Vol. IV. 



\ Quar. Jour. Geol. Soc. Lon. Vol. VII. 



§ K. G. S. I. Vol. XIII, part I. 



II Manual of Geology of India, p. 716. 



H R. G. S. I. Vol. X, p. 43. 



** Ibid. Vol. XIII, part I. 



