Actinopterycjii — Choiidwstei. 



101 



These fishes all have strongly heterocercal tails, but there 

 is one family (that of Catopteridre) in the Trias, in whicli the 



-Edi-i/notus crenatus. Agassiz (restoration bj- Dr. K. H.Traquair) ; 

 stones," Carboniferous Series of Scotland. 



' Cement- 



tail is hemi-heterocercal and the rays of the dorsal and anal Wall-case, 

 fins are nearly as few as their supporting cartilages. They are No. 8, and 

 I'epresented by Dictyopyge, from Europe, North America, and -^ ^q_ ^ 

 Australia, and by Cafopterus from North America. They are 

 a distinct link between the Chondrosteans and the great 

 majority of Mesozoic fishes. 



Here are also placed the Belonorhynchidse, which are 

 elongated fishes with much-produced snout, diphycercal tail, 

 and the trunk only armoured with four longitudinal rows of 

 scutes — one dorsal, another ventral, and one along the course of 

 the " lateral line " on each side. Skeletons of the small Belono- 

 rhyncJius styiolatus from the Upper Trias of Raibl, Carinthia, 

 and fine skulls of larger sjoecies from the Lower Lias of Lyme 

 liegis and the Upper Lias of Wilrtemberg, ai'e exhibited. 



Table-case, 

 No. 40. 



Fig. 144. — Plattisomus slriati'.ii, Agassiz (restoration by Dr. R. H.Traquair); Magnes'an 

 Limestone, Durliam. 



