434 
ACTINOPTERYGII. 
Genus GONATODUS, Traquair. 
[Quart. Journ. Geol. Soc. vol. xxsiii. 1877, p. 555.] 
Syn. Microconoclus, R. H. Traquair, Ganoid Fishes Brit. Carb. Form. 
(Pal. Soc. 1877), p. 12 (name only). 
Trunk fusiform. Mandibular suspensorium slightly oblique ; 
teeth robust, styliform, more or less bent, forming a single, regular, 
close series on the margin of each jaw. Fins well developed, 
consisting of numerous robust, closely-jointed rays, distally branch¬ 
ing : fulcra small. Base of pelvic fins short; dorsal and anal fins 
triangular, the former arising somewhat in advance of the latter; 
caudal fin forked. Scales large, smooth or feebly ornamented. 
Gonatodus punctatus (Agassiz). 
1835. Amblypterus punctatus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. 
p. 109, pi. iv. c. fig. 4 ( non figs. 3, 5-8). 
(?) 1872. Amblypterus anconocechmodus , R. Walker, Trans. Edinb. 
Geol. Soc. vol. ii. pt. i. p. 119, with plate. 
1877. Gonatodus punctatus, R, H. Traquair, Quart. Journ. Geol. Soc. 
vol. xxxiii. p. 555, and Proc. Roy. Soc. Edinb. vol. ix. p. 265, 
and Ganoid Fishes Brit. Carb. Form. (Pal. Soc.), pi. ii. figs. 4, 5. 
1890. Gonatodus punctatus , R. H. Traquair, Proc. Roy. Soc. Edinb. 
vol. xvii. p. 391. 
Type . Imperfect fish: Edinburgh Museum. 
The typr species, attaining a length of about 0*16. Maximum 
depth of trunk contained about three and a half times in the 
total length. Head and opercular apparatus small, triangular, 
occupying about one-fifth of the total length ; external bones with 
sparse stria lions, often interrupted, those of the operculum and 
subope‘culum transverse or obliquely directed downwards ; dentition 
consisting of acutely pointed teeth, each inclined first a little 
inwards, then bent outwards at an obtuse angle, with the apex 
finally erect. Pelvic fins arising nearer to the anal than to the 
pectorals. Scales very large, ornamented with close, transverse, 
and partly concentric, striations, becoming feeble or absent in the 
caudal region : hinder border delicately serrated. 
Form, Log. Calciferous Sandstone Series: Midlothian and 
Fifeshire. 
P. 842 Well-preserved specimen, in counterpart, wanting the 
pectoral fins and part of the caudal; War die, near Edin¬ 
burgh. Egerton Coll. 
