218 
ACTINOPTERYGII. 
Genus MESTURUS, Wagner. 
[Abh. k. bay. Akad. Wiss., math.-phys. Cl. vol. ix. 1862, p. 338.] 
Trunk diseoidal, abruptly produced into a small and short caudal 
pedicle. Head and opercular bones externally ornamented with 
granulations; teeth with a crimped and usually indented coronal 
apex ; vomerine teeth arranged in three principal series, with a 
varying number of irregular, small, intercalated series ; splenial 
dentition comprising one principal series of teeth, with about two 
inner and several outer irregular series of smaller teeth. Fin-rays 
robust, closely articulated, and much divided distally. Pelvic fins 
present; dorsal and anal fins deep throughout their extent, not 
specially elevated in front, and the former occupying about the 
hinder half of the back; caudal fin fan-shaped, having a sinuously 
convex hinder margin, and nearly surrounding the short caudal 
pedicle. Scales robust and covering the whole of the trunk; their 
upper and lower margins united by interlocking digitations, and 
their external surface tuberculated. 
Mesturus verrucosus, Wagner. 
[Plate XV.] 
1862. Mesturus verrucosus, A. Wagner, Abh. k. bay. Akad. Wiss., 
math.-phys. Cl. vol. ix. p. 338, pi. iii. fig. 1. 
Type. Nearly complete fish ; Palgeontological Museum, Munich. 
The type species, attaining a length of about 0 - 5. Maximum 
depth of trunk considerably exceeding its length from the scapular 
arch to the base of the caudal pedicle, and head with opercular 
apparatus occupying nearly one-third of the total length of the fish 
(including caudal fin). [Dentition unsatisfactorily known, but] the 
teeth of the outermost series on the splenial little inferior in size 
to those of the principal series. Dorsal fin with 32 rays, arising 
at the middle of the back behind its highest point; [anal fin 
incompletely known]. Tubercular ornamentation of the scales 
fine and closely arranged compared with that of the head-bones, 
except in the anterior half of the lateral line, where the tubercles 
form a series of irregular excrescences. All the principal scales 
exhibiting fine structural lines radiating backwards from a point- 
on their anterior margin, beneath the tubercular ornamentation. 
The vertical series of scales irregularly bifurcating towards the 
whole of the dorsal margin and towards the caudal half of the 
ventral margin. 
Form. S)' Loc. Lower Kimmeridgian (Lithographic Stone): Bavaria. 
