PETALODONTIDiE. 
45 
P. 2999. Six teeth, either of this species, or lateral teeth and young 
of P. acuminatus ; Richmond, Yorkshire. 
Ennishillen Coll. 
P. 3007. Fragmentary tooth, doubtfully of this species : Bristol. 
Ennishillen Coll. 
Petalodus grandis, Davis. 
1883. Petalodus grandis, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. i. p. 496, pi. lx. fig. 1. 
Type. Much broken tooth; British Museum. 
This name is given to a unique tooth of very large size (Yo. 
P. 2985) in the Enniskillen Collection. 
Form, Sf Log. Lower Carboniferous Limestone: Armagh. 
Petalodus fiabellula, sp. nov. 
Type. Detached tooth, shown of nat. size in PI. I. fig. 8. 
Crown comparatively high, having the posterior face (probably 
also the anterior) marked by large vertical and slightly diverging 
wrinkles; coronal margin very gently arched, faintly crenulated. 
Form. Sf Log. Carboniferous Limestone : Oreton, Shropshire. 
P. 227 a. Type specimen. Weaver Jones Coll. 
42219. Fragment of less abraded tooth. Baugh Coll. 
Petalodus linearis (Agassiz). 
1838. Chomatodus linearis, L. Agassiz, Poiss. Foss. vol. iii. p. 108, pi. xii. 
figs. 6, 9, 1 0, F figs. 5, 11 (non figs. 7, 8, 12, 13). 
Type. Detached teeth ; Bristol Museum. 
Teeth extremely elongated. The margin of the crown is arched, 
though scarcely tapering, at either extremity in the principal teeth; 
anterior and pos terior faces nearly equal; coronal surface smooth. 
The root is very short, not deeper than the crown. 
It is uncertain whether the tooth shown in Agassiz’s fig. 5 per¬ 
tains to this species, the crown more approximating in form to 
P. Jiastingsice. This specimen is referred to “ Antliodus” by Yew- 
berry and Worthen 1 . 
Many of the teeth commonly associated with this species may be 
provisionally referred to Helodus. Such are the originals of 
Agassiz’s figs. 7, 8, 12, 13, and one described and figured by Davis 2 ; 
1 Pal. Illinois, vol. ii. p. 52. 
2 Trans. Koy. Dublin Soc. [2] vol. i. p. 508, pi. lxi. fig. 1. 
