﻿~>\^ ACTJNOriERYGIl. 



is also a detached scale showing tuberculations near its 

 ventral border. EnnishUlen Coll. 



P. 5198-9. Two line specimens, the second measuring 0-11 in 

 length ; Longton, North Staffordshire'. Both these fossils 

 exhibit the form of the head and trunk, and part of the 

 upper and lower dentition of the fish, besides the propor- 

 tions of the pectoral and median fins. Purchased, 1885. 



P. 5190. Four imperfect fishes ; Longton. One is in counterpart, 

 displayingthe operculum, suboperculum, and post-temporal, 

 with other bones ; another exhibits well the scale-orna- 

 ment ; while a third also shows several head and opercular 

 bones, in addition to the maxillary dentition. 



Purchased, 1885. 



P. 5191. Very small imperfect fish, showing the dorsal peak; 

 Longton. Purchased, 1885. 



36892. Somewhat larger imperfect trunk with parts of the caudal 

 fin ; Longton. Purchased, 1862. 



21975. Two much crashed and broken examples of the caudal 

 region, in counterpart, probably of this species ; Carluke, 

 Lanarkshire. The fin- rays do not exhibit the character- 

 istic ornament — a circumstance that may be dae to their 

 splitting and showing the inner face. Purchased, 1818. 



P. 3500 a. Group of scales labelled by Agassiz ; Carluke, Lanark- 

 shire. EnnishUlen Coll. 



Platysomus tenuis triatus, Traquair. 



1866. Platysomus striatus, J. Young (errore), Quart. Journ. Geol. Sue. 



vol. xxii. p. 305. 

 1879. Platysomus tenuistriatus, R. H. Traquair, Trans. Roy. Soc. 



Edinb. vol. xxix. p. 369. 



Type. Fish : Museum of Practical Geology. 



A small species attaining a length of about 0'0y. Body rounded ; 

 dorsal margin strongly and evenly arched from the occiput to the 

 narrow caudal pedicle; ventral margin more gently curved from 

 the branchial region to the origin of the anal fin, from which it 

 then slopes rapidly upwards. Most of the head-bones finely striated, 

 but those of the cranial roof also in part granulated ; operculum 

 very high and narrow, interoperculum very small. Dorsal fin 

 arising somewhat behind the highest point of the back, and anal 



