PSAilMOBONTID^. 95 
rounded, but often comparatively acute. A median semicircular 
suture separates a very small posterior portion of each tooth. 
Form. ^ Loc. Lower Carboniferous Limestone : Armagh, Ireland. 
P. 2500. Type specimen. EnnisMllen Coll, 
P. 2501. A less perfect example, with the posterior semicircular 
portion broader, and the anterior margin less curved. 
Enniskillen Coll. 
Copodus atirictilatus (Davis). 
1862. Pleitrogomphus auriculatus (Agassiz MS.), Morris & Koberts, 
Quart. Joum. Geol. Soc. vol. xviii. p. 101 (name only). 
1883. Plewogomphus auriculatm, J. W. Davis, Trans. Koy. Dublin 
Soc. [2] vol. i. p. 472, pi. Iviii. fig. 16. 
Type. Detached tooth ; British Museum. 
Teeth similar to those of the latter species, but having two 
postero-lateral semicircular portions separated by suture, instead of 
the single median one. 
Form. ^ Loc. Lower Carboniferous Limestone : Armagh, Ireland. 
P. 2601. Type specimen. Enniskillen Coll. 
P. 2585. Less perfect, but larger example. Enniskillen Coll. 
Copodus minimus, Davis. 
1883. Copodus minimus, J. W. Davis, Trans. Koy. Dublin Soc. [2] 
vol. i. p. 467, pi. Iviii. fig. 8. 
Type. Detached teeth ; British Museum. 
Teeth longer than broad ; crown flat ; a curved, almost angu- 
larly bent, transverse suture dividing a small posterior portion of 
each tooth from the remainder. The posterior Wder of the entire 
tooth is very slightly excavated; and the tooth rapidly becomes 
narrowed anteriorly, the front margin being nearly straight. 
Form. ^ Loc. Upper Carboniferous Limestone : Kichmond, York- 
shire. 
P. 2511. Type specimen. The suture is shown in this fossil, though 
not noted in the original description and scarcely in the 
Enniskillen Coll. 
P. 2512. Two much abraded teeth, probably referable to this species, 
but larger. Enniskillen Coll, 
