*58 
CHIM2ER0IDEI. 
P. 600. Type specimen, almost detached from matrix and much 
abraded externally. Egerton Coll. 
P. 5152. Eight mandibular tooth exhibiting relatively larger tritors, 
hut probably of this species, shown, of the natural size, in 
PI. I. figs. 11 a, b. Egerton Coll. 
P. 3105. Imperfect left mandibular tooth, outer aspect. 
Enniskillen Coll.- 
A supposed distinct species is founded upon a right mandibular 
tooth exhibiting only the outer aspect; but it is not capable of 
definition and precise separation from G. rugidosus. The original 
specimen was described as Chimcera curvidens , Egerton, Proc. Geol. 
Soc. vol. iv. (1843), p. 154, and subsequently named Ischyodus 
curvidens , Egerton, ibid. p. 156, and Ganodus curvidens , Egerton, 
Quart. Journ. Geol. Soc. vol. iii. (1847), p. 352; it is placed first in 
the following series of teeth from the Stonesfield Slate, which repre¬ 
sent the “ species ” in the collection :— 
P. 599. Type specimen, shown, of natural size, in PI. I. fig, 12. 
Egerton Coll. 
P. 3104. More imperfect left mandibular tooth of similar form. 
Enniskillen Coll. 
28595. Small right mandibular tooth ; Eyeford, Gloucestershire. 
Purchased , 1853. 
Ga&o&ns sp. 
[Plate I. fig. 13.] 
A single example of a palatine tooth from the Stonesfield Slate 
(P. 3107. Enniskillen Coll.) indicates an unusually large species of 
Ganodus. The specimen is of the right side and is shown, of the 
natural size, from the oral aspect, in PI. I. fig. 13; the inner tritors 
are few, large, and well-separated, and the outer tritors have only 
three minute representatives. It is possible that the fossil pertains 
to the same species as the imperfect right mandibular tooth described 
as Chimcerci bucklandi , Egerton, Proc. Geol. Soc. vol. iv. (1843), 
p. 153, Ischyodus bucklandi , Egerton, ibid. p. 156, and subsequently 
described and figured by Agassiz, Poiss. Eoss. vol. iii. (1843), p. 343, 
pi. xl. c. fig. 19, under the name of Chimcera ( Ischyoclon) bucklandi , 
afterwards assigned to Ganodus by Egerton, Quart. Journ. Geol. Soc. 
vol. iii. (1847), p. 352. This specimen, however (P. 478. Egerton 
Coll.), is too imperfect both for generic and specific determination. 
To Ganodus , also, must probably he assigned the following small 
dorsal fin-spines from the Stonesfield Slate, all obtained from Stones- 
field, unless otherwise stated ;— 
