WELLBURN : FISH FAUNA OF LOWER CARBONIFEROUS ROCKS. 381 
Genus Dicrenodus Romanowsky, 1853, Bull. Soc. Imp. Nat., 
Moscow, pt. i., p. 408, 1853. 
D. dentatus (M'Coy), A. S. Woodward, Cat. Foss. Fish, B.M., 
pt. i., p. 28. 
Teeth : Brit. Mus. 
Form and Loc : Carbonif. limestones, Wensleydale and 
Pateley Bridge. 
Family Petalodontidje. 
Genus Janassa G. von Miinster, Beitr. Petrefakt, pt. i., p. 67. 
J. clavata (M'Coy), A. S. Woodward, I.e., p. 37. 
Detached teeth : Brit. Mus. 
Form and Loc: Carbonif. limestones, Richmond. 
Genus Petalodus R. Owen, Odontograph, p. 61 (1841). 
P. acuminatus Agassiz, Pois Foss., vol. iii., pp. 174, 384. 
Syn.: P. inxquilateralis Davis, Trans. Roy. Dub. Soc, 
vol. i., p. 497 (1883). 
Detached Teeth : York and Brit. Mus., Author's col. 
Form and Loc: Carbonif. limestones, Wensleydale, Rich- 
mond, and Settle. 
P. Imstingsice (M'Coy), Brit. Pal. Foss., p. 635 (1855). 
Teeth : York and Brit. Mus. 
Form and Loc: Carbonif. limestones, Wensleydale and 
Richmond. 
P. fiabellula A. S. Woodward, I.e., 1889, p. 45. 
Teeth : York Mus. 
Form and Loc: Carbonif. hmestones, WensWdale. 
P. lamelliformis ? Davis, Quart. Jour. Geol. Soc, vol. xl., p. 625. 
Syn.: Chromatodus lamelliformis Davis, I.e., p. 625. 
Teeth : York Mus., Author's col. 
Form and Loc: Carbonif. limestones, Wensleydale. 
Note. — Glyphanodus tenuis Davis. The teeth on which 
the late J. W. Davis founded this genus and species 
appear to be worn teeth of some species of Petalodus. 
Genus Petalorhyncus Newberry and Worthen (ex Agassiz 
MS.), Pal. Illinois, vol. ii., p. 32, 1866. 
