COCHLIODOXTIDiE. 
221 
P. 2815. Three teeth of the form, named Helodus angulatus, New¬ 
berry & Worthen 3 ; Burlington Limestone, Quincy, Illi¬ 
nois. Enniskillen Coll. 
P. 2803. Tooth of the form named Helodus sulcatus, Newberry & 
Worthen 1 2 ; Keokuk Limestone, near Warsaw, Illinois. 
Enniskillen Coll. 
II. Large laterally compressed teeth, with a median eminence. 
P. 2633-4. Two type specimens of Helodus tenuis , J. W. Davis, 
Trans. Boy. Dublin Soc. [2] vol. i. p. 454, pi. lix. figs. 3, 
4 ; Armagh. Enniskillen Coll. 
P. 2835. About forty similar teeth, only differing from those of 
Helodus crcissus , Davis, in their extreme lateral com¬ 
pression ; Armagh. Enniskillen Coll. 
P. 2608-9. Two teeth, forming the type specimens of Helodus 
clavatus , J. W. Davis, Trans. Boy. Dublin Soc. [2] vol. i. 
(1883), p. 455, pi. lix. figs. 5, 6; Armagh. 
Enniskillen Coll. 
III. Small conical teeth. 
P. 2836. Type specimen of Helodus richmondiensis , J. W. Davis, 
Trans Boy. Dublin Soc. [2] vol. i. p. 456, pi. lix. fig. 8 ; 
Upper Carboniferous Limestone, Bichmond, Yorkshire. 
Enniskillen Coll. 
P. 4900. Similar, but slightly larger tooth; Yoredale Bocks, Wens- 
leydale, Yorkshire. Ho7me Coll. 
P. 2608. Type specimen of Helodus triangularis, J. W. Davis, Trans. 
Boy. Dublin Soc. [2] vol. i. p. 456, pi. lix. fig. 9 ; Lower 
Carboniferous Limestone, Armagh. Enniskillen Coll. 
P. 2612. Similar tooth; Armagh. Enniskillen CoU. 
P. 4191 a. Smaller tooth, with crimped margin; Armagh. 
Enniskillen Coll. 
P. 2607. Type specimen of Helodus acutus , J. W. Davis, Trans. Boy. 
Dublin Soc. [2] vol. i. p. 455, pL lix. fig. 7 ; Armagh. 
Enniskillen Coll. 
1 Pal. Illinois, vol. ii. (1866), p. 83, pi. v. figs. 9-15. 
2 Tom. cit. pi. v. fig. 16. 
