WELLBURN : FISH FAUNA OF YORKSHIRE COAL MEASURES. 163 
Sp. Cladodus species ? 
Teeth rare, distribution very limited. 
Genus: Phcehodusl St. John and Worthen, 1875. 
One tooth from the Better Bed Coal Shale, Low Moor, 
appears to show the characters of this genus, the principal lateral 
cones of the tooth being as large as the median cone. 
Order : Selachii. 
Sub-order : Tectospondyli. 
Family : Petalodontidae. 
Genus: Janassa Munster, 1832. 
Sp. J. linguceformis Atthey, 1870. 
Teeth rare and distribution very limited. 
Sp. J. sulcatus sp. nov. 
Type : Teeth, author's collection. After having carefully com- 
pared these teeth with the specimens of Janassa in the British 
Museum (Natural History), Cromwell Road, and with the figures 
and descriptions of Munster"^ and others, I am of the opinion that 
these teeth belong to a new species, for which I propose the 
specific name sulcatus, as their chief peculiarity is a deep, well- 
marked sulcus on their anterior surface, the crown is thin and 
petal-shaped, the base broad and crossed by several well-marked 
transverse ridges. Teeth rare, distribution limited. 
Genus : Petalodus Owen, 1840. 
Sp. P. hastingsi(v McCoy, 1855. 
Teeth not common, distribution very limited. 
Sp. P. ornatus sp. nov. 
Type : Teeth, author's collection. 
The teeth in general form resemble those of the last species, 
but differ in the fact that the anterior surface is ornamented 
with a series of sharply-cut grooves arranged in festoons, one series 
being median and two lateral. I have compared the teeth with 
the Petalodont Teeth in the British Museum (Natural History), 
Cromwell Road, and as I have not seen any teeth showing the 
above characters, I venture to consider the species as new. 
Form, and Loc. : Better Bed Coal, Low Moor. 
* Beitr. Petrefalct i., p. 67, pi. iv., Figs. 1, 2. 
