FOSSIL FISHES. 



29 



provided either with conical or flattened teeth arranged in longitu- 

 dinal rows, or with formidable pointed teeth, and large and small 

 prem axillary teeth. (See Table-cases 44, 45.) 



The dorsal and anal tins were long aud opposite one another ; 

 the caudal fin equilobate externally, but the notochord very dis- 

 tinctly upturned at its termination. 



Fig. 40. -Cheirodus granulosus, Young (restoration after Traquair), Coal-measures. 



The Lepidosteoid fishes have a rauge in time from the Lias to 

 the present day. Among the genera represented are Lepidotus, 

 Dapedius, Tetragonolepis, Heterolepidotus, PJiolidopJiorus, Pachy- 

 connus, Semionotus, Aspidorhynclius, etc. (See Wall-cases 9, 10, 11, 

 12, 13 and 14; and Table-cases 40, 41, 42, 43, 44, 45.) 



Fig. 47. — Palceoniscus macropomus, Ag. (from a restoration by Dr. R. H. Traquair), 



Kupferschiefer. 



One of the largest of these is Lepidotus maximus (Wall-case 10), 

 from the Lithographic Stone of Solenhofen, in Bavaria, which 

 measures 5 feet 7 inches in length, and i3 2 feet in greatest depth. 



