PLATE IV. 
Fi S- . . Page 
1. Ctenodus cristatus , Ag.; bones of cranial roof, two-thirds 
nat. size.—Coal-Measures ; Clan way, North Stafford¬ 
shire. t. Dental plate. 0. Median azygous series. 
I. Inner paired series. II. Second paired series. III. 
Third paired series. [P. 5031.] 252 
2. Sagenodus incequalis, Owen; right upper dental plate of 
young, twice nat. size.—Coal-Measures ; Newsham. 
[P. 3381.] 259 
3. Ditto; right lower dental plate, twice nat. size.—Coal- 
Measures ; Longton. [P. 3381 a.] 259 
4. Ctenodus murchisoni , Ward; left upper dental plate.— 
Upper Coal-Measures; Leebotwood. [P. 518.] 255 
5. Uronemus sjplendens , Traq. ; lower marginal teeth.— 
Middle Carboniferous Limestone ; Borough Lee. 
[P. 5986,] 250 
