﻿1>40 BIBENOIDEI. 



P. 756. Impression of a large crushed fish, and two portions of 

 small individuals ; Caithness. Egerton Coll. 



P. 3374, P. 4597. The caudal half of two small individuals, and a 

 mass of scales of a large fish ; Caithness. 



Ennisfcillen Coll. 



P. 3374 a. Incomplete small fish, probably of this species ; Orkney. 



EnnisTcillen Coll. 



19808. Small fish, either of this or the following species ; Caithness. 



Purchased, 1845. 



P. 3373. Imperfect small fish, probably of this species ; Orkney. 



Enniskillen Coll. 



P. 825. Scales, probably of this species ; Edderton, near Tain, Ross- 

 shire. Egerton Coll. 



P. 1175. Remains of head and trunk, probably of this species ; 

 Edderton. Egerton Coll. 



Dipterus macropterus, Traquair. 



1888. Dipterus macropterus, R. H. Traquair, Geol. Mag. [3] vol. v. 

 p. 508. 



1889. Dipterus macropterus, R. H. Traquair, ibid. vol. vi. p. 97, pi. ii. 



Type. Nearly complete fish ; Edinburgh Museum. 



A species usually attaining a length of about 0-2. Eorm and pro- 

 portions oi" head and trunk as in the type species. Anterior dorsal 

 fin relatively very small ; posterior dorsal very large, much longer 

 than high. Scales relatively thin. 



Form. Sf Loc. Lower Old Red Sandstone : Caithness. 



42473-78. Six specimens, four showing the nearly complete fish, 

 the others also exhibiting several details of structure ; 

 John -o '-Groats. Peach Coll. 



42479. Portion of axial skeleton and scales of a comparatively large 

 fish; John-o '-Groats. Peach Coll. 



The following species, being known only by detached dental 

 plates, are doubtfully of this genus : — 



Dipterus (?) serratus, Eichwald. 



1844. Ctenodus serratus, E. von Eichwald, Bull. Soc. Imp. Nat. Moscou, 

 vol. xvii. p. 828. 



1845. Ctenodus keyserlingii, L. Agassiz, Poiss, Foss. V. G. R. p. 122, 

 pi. xxxiii. figs. 32-35. 



