ROOM V. LIST OF GENERA OF FOSSIL FISHES. 451 



render it improbable that they will be materially invalidated by future 

 discoveries ; for they accord remarkably with the results derived from 

 the investigation of the fossil remains of the other Classes of animals. 

 The most modern deposits contain the remains of animals allied to species 

 of existing genera ; the most ancient, of forms altogether extinct, or of 

 excessive rarity in the recent faunas. The discovery of existing species, 

 or genera, in the most ancient strata, would modify, but not destroy, the 

 inferences deduced from the facts hitherto obtained ; and every geolo- 

 gist is prepared to find that such may be the case. 



Thus, of the sharks, with serrated triangular teeth, whose relics are so 

 common in the Tertiary formations, and were formerly unknown in the 

 ancient Secondary, one representative has been found in the Carbonife- 

 rous system - l but, if teeth of this character should hereafter be discovered 

 in other Secondary deposits, the great preponderance of this type in the 

 Tertiary strata, and in the existing seas, would not be the less remark- 

 able. 





LIST OF THE GENERA OF FOSSIL FISHES, OF WHICH THERE ARE 

 EXAMPLES OF ONE OR MORE SPEIES IN ROOM V. OF THE 

 BRITISH MUSEUM. 



WALL-CASE A.-(l, to 5.) 

 Coccosteus. (C. decipiens, C. cuspidatus, from the Devonian of Cro- 



marty ; C. oblongus, from Lethenbar.) 



Cephalaspis. (C. Lyellii, from the Devonian formation, Forfarshire.) 

 Gyrolepis. (G. Kankinii.) 

 Pholidophorus. (P. taxis.) 

 Amblypterus. (A. macropterus.) 

 Pamphractus. (P. hydro philus.) 

 Diplacanthns. (D. striatus.) 

 Cheiracanthus. (C. microlepidotus.) 

 Pterichthys. (P. oblongus.) 

 Platysomus. 



Cheirolepis. (C. Cummingiae, from Devonian strata, Cromarty.) 

 Acanthodes. (A. Brownii.) 



Osteolepis. (0. intermedius, Devonian, Cromarty.) 

 Dapedius. (D. politus, D. Colei, lias of Dorsetshire.) 

 Tetragonolepis. (T. speciosus, from the lias, Lyme Kegis.) 

 Semionotus. (S. Bergeri, a group of several, in lias, Coburg.) 

 Paleeoniscus. (Several from the Zechstein of Thuringia.) 

 Lepidotus. (L. Fittoni, L. Mantelli, Wealden of Tilgate Forest.) 



WALL-CASE B. (6, to 14.) 

 Dipterus, (D. macrolepidotus.) 



Leptolepis. (Several species from the Oolite, Solenhofen.) 

 Sauropsis. (S. latus.) 



1 Carcharopsis prototypus. 



