1854.] EGERTON — FOSSIL FISH FROM THE DECCAN. 371 



and the free edges of the scales are rudely and irregularly notched. 

 The mode of articulation is not very well seen, but it appears to have 

 been by means of a broad central rib, somewhat resembling this 

 arrangement in the genus Aspidorhynchus, and not by means of a 

 marginal rib, as in the Pycnodonts. There are fourteen rows in the 

 dorso-ventral series, and thirty-four in the longitudinal direction. 

 The lateral duct pierces a row of broad scales extending from the 

 upper margin of the opercular apparatus to the centre of the tail. 



The characters described in the foregoing details show Biptero- 

 notus to be a member of the Lepidoid family of Ganoids. Its posi- 

 tion in that family cannot be assigned with any degree of certainty ; 

 but it may at all events be provisionally arranged near the genus 

 Eurynotus. 



I may add that, having forwarded to Professor Agassiz a drawing 

 of the tail, together with my reasons for considering it a homocerque 

 form, he has kindly replied to me as follows : — " I see no sort of 

 reason to place it anywhere except among homocerques ; it is not 

 even as much heterocerque as some I have previously referred to that 

 [homocerque] division." 



DESCRIPTION OF PLATE XI. 



Fig. 1 . Dipteronotus cyphus, nat. size. 

 Fig. 2. Caudal extremity, magnified. 



3. Palichthyologic Notes. No. 7. On Tvfo new Species of 

 LEPiDOTTjs/?-om the Deccan. By Sir P. de M. Grey Eger- 

 TON, Bart., M.P., F.R.S., F.G.S. 



[Plate XII.] 



The discovery of remains of fossil fishes in the table-land of the 

 Deccan was first brought under the notice of the Geological Society 

 in 1851 by Colonel Sykes*. The only specimen he had then re- 

 ceived sufficiently perfect for description, proved to be a new spe- 

 cies of the genus Lepidotus. In the course of last yearf further 

 specimens were received from the same district, but apparently from 

 a different bed, which indicated a new species of the genus Tetrago- 

 nolepis of Agassiz, now ^chmodus (vide supra, p. 367). 



The specimens described in this memoir were sent to me a few 

 days since by Colonel Sykes. They are bedded in a similar bitumi- 

 nous shale to that containing Lepidotus Beccanensis, and are stated 

 to have been found in the same locality. They are both clearly 

 distinct from that species and from each other, although they all 

 possess in common the characteristics of the Liassic section of the 

 genus Lepidotus. 



Lepidotus longiceps, Egerton. Plate XII. fig. 1. 



There are two specimens assignable to this species ; one much 

 mutilated, the other very perfect, with the exception of the tail. The 

 * Quart. Journ. Geol. Soc. vol. vii. p. 272. t See ibid. vol. ix. p. 351. 



