﻿526 ACTTNOPTERYGIT. 



Scales of moderate size, the exposed area rhombic in shape, orna- 

 mented with numerous closely arranged elongated tubercles, in hori- 

 zontally directed parallel series. 



Form. 6f Loc. Upper Hawkesbury-Wianamatta Series : Talbralgar, 

 New South Wales. 



Not represented in the Collection. 



Genus HOLURUS, Traquair. 



[Trans. Roy. Soc. Edinb. vol. xxx. 1881, p. 43.] 



Trunk robust. Mandibular suspensorium oblique ; teeth small 

 and conical. Ein-rays simple, not branching, but merely attenuated 

 distally ; fulcra minute or absent. Dorsal fin rounded, elongated, 

 arising in advance of the somewhat shorter anal; caudal fin 

 obliquely truncated posteriorly, not forked. Scales sculptured ; a 

 prominent series of ridge-scales between the occiput and the dorsal 

 fin. 



Holurus parki, Traquair. 



1881. Holurus parte, R. H. Traquair, Trans. Roy. Soc. Edinb. vol. xxx. 

 p. 44, pi. hi. figs. 9-12. 



Type. Imperfect fish ; Geological Survey of Scotland. 



The type species, attaining a maximum length of about 0*1. 

 Maximum depth of trunk contained about three and a half times in 

 the total length. Head and opercular apparatus occupying about 

 one quarter of the total length ; external bones ornamented with 

 fine striae, sometimes interrupted. Scales of the abdominal region 

 and the anterior portion of the caudal region finely striated, a few 

 of the striae concentric with the margins, but the majority oblique 

 and some terminating in denticulations of the hinder border ; ridge- 

 scales finely striated. 



Form. 4' Loc. Calciferous Sandstones (Cement-stone Group) : 

 Eskdale, Dumfriesshire. 



P. 4055. Imperfect head and abdominal region. 



Purchased, 1883. 



P. 5982. Imperfect fish, wanting part of the head and upper caudal 

 lobe. Purchased, 1889. 



Two doubtful species from the Calciferous Sandstones are also 

 named Holurus fulcratus (Traquair, loc. cit. p. 46, pi. iii. figs. 13, 

 14) and E. ischypterus (ibid. p. 66, pi. iii. figs. 15, 16), the former 

 from Eskdale and the latter from Coldstream Bridge. The first is 



