﻿PLATYSOMATIDiE. 



537 



1879. Cheirodus granulosus, R. H. Traquair, Trans. Roy. Soc. Edinb. 



vol. xxix. p. 363, pi. v. 

 1890. Cheirodus granulosus, J. Ward, Trans. N. Staffs. Inst. Mining 



Engin. vol. x. p. 184, pi. vii. figs. 1-9. 



Type. Well-preserved fish ; collection of John Ward, Esq., Long- 

 ton. 



A species attaining a maximum length of about 0-2. Dorsal and 

 ventral peaks of trunk acuminate, reflexed, the former very slightly 

 in advance of the latter, and the distance between the two about 

 equal to the total length of the head and trunk without the caudal 

 fin. Head and opercular apparatus occupying nearly one quarter 



Eig. 57. 



Cheirodus granulosus (Young). — Restoration by R. H. Traquair. 



of the total length ; both ridges of pterygoid and splenial bones 

 coarsely, but irregularly denticulated. Dorsal and anal fins arising 

 immediately behind the dorsal and ventral peaks, forming an in- 

 significant low fringe ; depth of caudal expansion considerably more 

 than one-half the maximum depth of the trunk. Scale-ornament, 

 as also that of the head and opercular bones and pectoral arch, 

 consisting of coarse tuberculations, sometimes partly confluent, 

 often arranged in series. 



This is the type species of the so-called Amphicentrum. 



Form. &f hoc. Coal-Measures : Staffordshire, Lancashire, and 

 Lanarkshire. 



