CARBONIFEROUS FISH-FAUNA, 
Puate VITI. 
Fig. 1.—Strepsodus decipiens, sp. nov.; portion of left man- 
dibular ramus, outer aspect, showing a row of 
small teeth on the dentary bone, with two imper- 
fectly preserved laniary teeth in close apposition 
(one tooth and its successor) on an internal bone in 
front; also another imperfect bone crushed on the 
anterior end of the jaw; nat. size. 
la.—Section of jaw, showing vertical section of laniary 
tooth with its basal folds. 
Fig. 2.—Ditto; vertical section of upper part of tooth, with 
indications of pulp-cavity; nat. size. 
Fig. 3.—Ditto; vertical section of laniary tooth in matrix, show- 
ing basal folds; nat. size. 
Fig. 4.—Ditto; magnified transverse sections of laniary tooth, 
showing nature of folds at base (4), minute strue- 
ture of dentine (4a, 46), and absence of folds in 
the upper part where the pulp-cavity still persists 
(4c). 
Figs. 5—7.—Ditto; abraded and partially decayed scales, display- 
ing inner structure, the originally-exposed sector 
directed downwards ; nat. size. 
6a.—Scale-structure magnified, part of the exposed 
sector to the right, covered portion to the left. 
Fig. 8.—Ditto; impression of inner face of undisturbed squama- 
tion; nat. size, 
Fig. 9.—Ditto; impression of inner face of scattered scales, 
showing internal median tubercle; nat. size. 
Fig. 10.—Ditto ; abraded and partially decayed scale of lateral 
line, showing infilled slime-canal ; associated with 
the type-scale, which is not figured ; nat. size. 
Fig. 11.—Ditto; scale. 
Fig. 12.—Ctenodus breviceps, sp. noy.; impression of part of 
caudal region, exhibiting neural and heemal 
elements of vertebral axis; nat. size. 
[Es'0u) 
