PLATYSOMATTDJE. 
535 
Genus WARDICHTHYS, Traquair. 
[Ann. Mag. Nat. Hist. [4J vol. xv. 1875, p. 266.] 
Trunk very deep, nearly circular in side view. [Dentition un¬ 
known.] Pin-rays closely articulated and distally bifurcating; 
fulcra present. [Paired fins urknown.] 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. AVell-developed, acuminate ridge-scales 
present in advance of the dorsal and anal fins. 
Wardichthys cyclosoma, Traquair. 
1875. Wardichthys cyclosoma, E. H. Traquair, Ann. Mag. Nat. Hist. 
[4] vol. xv. p. 262, pi. xvi. figs. 1-5. 
1879. Wardichthys cyclosoma, E. H. Traquair, Trans. Eoy. 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. 
X 
Type. Pish, wanting tail and paired fins; collection of Dr. E. H. 
Traquair. 
The hype species, attaining a length of about 0*09. Tuberculations 
of scales very coarse, tending'towards fusion into transverseYidgesX 
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. Joum. 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 
