150 REPORT—1874. 
with well-developed postarticular process. Teeth conical; their internal structure 
complex; dentine much folded. Palato-vomerine tusks in series with small teeth. 
Short inner series of mandibular teeth. Sculptured thoracic plates, with reflected 
process upon the external border. 
* Palatine foramina large, approximated, 
+ Mandible with an internal articular buttress. 
t Orbits central or posterior. 
1. Mastodonsaurus, Jager. 
2. Capitosaurus, Miinst. 
3. Pachygonia, Hualey (?). 
4, Trematosaurus, Braun. 
5. Gonioglyptus, Huzley. 
tt Orbits anterior. 
6. Metopias, Von Meyer. 
7. Labyrinthodon, Owen’. 
++ Mandible without internal articular buttress. 
8. Diadetognathus, Miall, 
** Palatine foramina small, distant. 
9. Dasyceps, Hualey. 
10. Anthracosaurus, Huxley. 
II. Bracuyopina. Skull parabolic. Orbits oval, central or anterior. Postar- 
ticular process of mandible wanting (?). 
11. Brachyops, Owen. 
12. Micropholis, Huzley. 
13. Rhinosaurus, Waldheim. 
14. Bothriceps, Huzley. 
III. CuHavrroponta*®. Skull vaulted, triangular, with large postero-lateral ex- 
ansions, Lyra consisting of two nearly straight longitudinal grooves, continued 
ackwards as ridges®. Orbits moderate or large, posterior. Temporal depressions 
passing backwards from orbits’. No postarticular process to mandible*. Teeth 
unequal, clustered. 
* Teeth with large anterior and posterior cutting-edges. 
15, Loxomma, Hualey. 
%** Teeth conical. 
16. Zygosaurus, D’ Lichwald. 
17. Melosaurus, Von Meyer. 
IV. Aruroéponta. Maxillary teeth wanting. Vomerine teeth aggregated. 
Orbit imperfect. 
18. Batrachiderpeton, Hancock §- Atthey. 
19. Pteroplax, Hancock § Atthey ®. 
Ae = uncharacterized group for the reception of some or all of the following 
genera. 
20. Pholidogaster, Hualey. 
21. Ichthyerpeton, Hualey. 
22. Pholiderpeton, Huailey. 
+ Orbits unknown. 
* The name of Malacocyla was previously proposed for this section. The name, how- 
ever, is inappropriate for Melosawrus, which we have since seen reason to associate with 
Loxomma and Zygosaurus. 3 Unknown in Melosaurus. 
Loxomma, Zygosaurus. ° Loxomma, Melosaurus. 
* The yomerine teeth are unknown, and this genus may therefore require to be 
removed. 
