204 
SELACHII. 
P. 1413. Seven imperfect examples ; Armagh. Egerton Coll. 
46818. Small specimen ; Derbyshire. Oilbertson Coll. 
P. 5355. Ten fragmentary small dental plates ; Ticknall, S. Derby- 
shire. The two most nearly perfect specimens are shown 
of the natural size in PI. I. figs. 23, 24. Wilson Coll. 
Poecilodus gibbosus, Davis. 
1883. l-cBcihdus yibbosm, .1. W. Davis, Trans. Roy. Dublin Soc. [3] 
vol. i. p. 446, pi. liii. fig. 27. 
Type. Detached dental plate ; British Museum. 
Maximum antero-posterior diameter of the dental plate not much 
greater than its breadth ; coronal corrugations numerous, continuous. 
Anterior diverging ridge small, the posterior very prominent, though 
not affecting the extreme postero-lateral margin ; inner margin 
deeply sinuous. 
Form. ^ Loc. Lower Carboniferous Limestone : Armagh and 
Sligo, Ireland. 
(i.) Rounded variety {^. ujiper jaw). 
P. 2463-4. Type specimen, and two similar dental plates; Armagh. 
Enniskillen Coll. 
P. 2464 a. A smaller dental plate, probably of this species ; Armagh. 
Enniskillen Coll. 
(ii.) Angidated variety (? lower jaw). 
P. 2465. Nearly complete tooth, shown, of the natural size, in 
PI. VI. fig. 23 ; Callooney, Sligo. Enniskillen Coll. 
An undetermined .species, possibly of Peecilodus, is indicated by the 
following tooth, which exhibits no ridges extending from the outer 
to the inner border : — 
42231. Tooth measuring 0'013 by 0'007, the transverse rugm few 
and irregular ; Carboniferous Limestone : Croton, Shrop- 
shire. Baugh Coll. 
The following species have also been founded upon detached 
teeth, but there are no examples in the Collection : — 
Faecilodvs rarlmiarivs, St. John & Worthen, Pal. Illinois, vol. vii. 
(1883), p. 130, pi. viii. figs. 20, 21.— Upper Coal Meas- 
ures; Illinois and Kansas, U.8.A. 
