﻿PLATYSOMATTD^J. 535 



Genus WARDICHTHYS, Traquair. 



[Ann. Mag. Nat. Hist. [4] vol. xv. 1875, p. 266.] 



Trunk very deep, nearly circular in side view. [Dentition un- 

 known.] Fin-rays closely articulated and distally bifurcating ; 

 fulcra present. [Paired fins unknown.] Dorsal fin small, arising 

 considerably behind the middle point of the back, high and acumi- 

 nate in front, fringe-like behind ; anal fin similarly shaped, but 

 still smaller, and both these fins terminating at the base of the 

 caudal pedicle ; [caudal fin unknown]. Scales ornamented with 

 tuberculations or short striae, with smooth hinder border and broad 

 overlapped anterior border ; principal flank-scales much deeper than 

 broad, with an anterior inner keel and broad peg-and-socket articu- 

 lation ; dorsal and ventral scales, and those of the caudal pedicle, 

 at least as broad as deep. Well-developed, acuminate ridge-scales 

 present in advance of the dorsal and anal fins. 



Wardichthys cyclosoma, Traquair. 



1875. Wardichthys cyclosoma, R. H. Traquair, Ann. Mag. Nat. Hist. 



[4] vol. xv. p, 262, pi. xvi. figs. 1-5. 

 1879. Wardichthys cyclosoma, R. H. Traquair, Trans. Roy. Soc. Edinb. 



vol. xxix. p. 361, pi. iv. figs. 12-15. 

 1881. Wardichthys cyclosoma, T. Stock, Ann. Mag. Nat. Hist. [5] vol. 



vii. p. 490. 



Type. Fish, wanting tail and paired fins ; collection of Dr. R. H. 

 Traquair. 



The type species, attaining a length of about O09. Tuberculations 

 of scales very coarse, tending towards fusion into transverse ridges. 



Form. Sf Log. Calciferous Sandstones : Wardie, near Edinburgh. 



46812. Plaster cast of type specimen. 



Presented by Dr. R. H. Traquair, 1875. 



Genus CHEIRODUS, M'Coy. 

 [Ann. Mag. Nat. Hist. [2] vol. ii. 1848, p. 130 (Chirodus).] 



Syn. Amphicentrum, J. Young, Quart. Journ. Geol. Soc. vol. xxii. 

 1866, p. 306. 

 Hemicladodus, J. W. Davis, Quart. Journ. Geol. Soc. vol. xl. 

 1884, p. 620. 



Trunk deep and rhombic, the dorsal and ventral margins elevated 

 into peaks, which are nearly or quite opposite. Upper contour of 



