PETALODONTIDJ!. 
57 
Polyrhizodns magnos, McCoy 
1843. Petalodus radicans, L. Agasaiz, Poiss. Foss. vol. iii. pp. 174, 384 
(name only). 
1848. Potyrhizodug magnug, F. McCoy, Ann. & Mag. Nat. Hist. [2] 
vol. ii. p. 126. 
1855. Polyrhizodm magnus, F. McCoy, Brit. Pal®oz. Foss. p. 641, 
pi. 3 K. figs. 6-8. 
1883. Polyrhizodm radkam, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. i. p. 600, pi. lx. figs. 7, 8. 
1883. Polyrhizodm constrictm, J. W. Davis, totn. cit. p. 506, pi. lx. 
fig. 15. 
Type. Detached tooth. 
Crown of teeth moderately high, with the base-line curved both 
in front and behind. “ Rootlets ” six to eight in number, each 
generally divided again into two. 
Form. ^ hoc. Lower Carboniferous Limestone : Armagh. 
P. 2963-4. Specimens figured by J. W. Davis, loe. cit. 
Enniskillen Coll. 
P. 2965. Twenty-three specimens. Enniskillen Coll. 
P. 2978. Seven specimens ; Tynan, Armagh. Enniskillen Coll. 
P. 1467. Four small teeth, approaching P. sinuosus. Egerton Coll. 
P. 1467 h. Two imperfect large teeth. Egerton Coll. 
P. 2977. Type specimen of P. constnctus. This is a fragment of 
a tooth similar to the last. Enniskillen Coll. 
Polyrhizodus colei, Davis. 
1883. Polyrhizodm colei, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. i. p. 502, pi. lx. figs. 9, 10. 
1884. Polyrhizodus colei, J. AV. Davis, Quart. Joum. Geol. Soc. vol. xl. 
p. 022, pi. xxvii. fig. 13. 
Type. Detached tooth ; British Museum. 
Crown of tooth relatively high, with much-curved base-line, con- 
siderably overhanging the root in front. “ Rootlets ” only incom- 
pletely subdivided. 
Form. ^ Loc. Lower Carboniferous Limestone : Armagh. Upper 
Carboniferous Limestone (Yoredale Rocks) : Yorkshire (/. W. Davis). 
' The tooth figured by Portlock (Geol. Londonderrj-, pi, xiv. fig. 9) under 
the name of Petalodus rectus, Agass., is considered to be a young example of 
this species by Morris and Boberts, Quart. Joum. Geol. Soc. vol. xviii p. 102. 
