CABBONIFEROUS FISH-FAUNA, 
Plate VIII. 
Pig. 1. — Strepsodus decipieus, 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 hasal folds. 
Pig. 2. — Ditto ; vertical section of upper part of tooth, with 
indications of pulp-cavity; nat. size. 
Pig. 3. — Ditto ; vertical section of laniary tooth in matrix, show- 
ing hasal folds; nat. size. 
Pig. 4. — Ditto ; magnified transverse sections of laniary tooth, 
showing nature of folds at base (4), minute struc- 
ture of dentine (4 a, 45), and absence of folds in 
the upper part where the pulp-cavity still persists 
(4c). 
Pigs. 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. 
hig. 8. Ditto, impression of inner face of undisturbed squarna- 
tion ; nat. size. 
hig. 9. Ditto; impression of inner face of scattered scales, 
showing internal median tubercle; nat. size. 
big. 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. 
Pig. 11. — Ditto; scale. 
Pig. 12. Ctenodus breviceps, sp. nov. ; impression of part of 
caudal region, exhibiting neural and haemal 
elements of vertebral axis; nat. size. 
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