236 
SELACHII. 
Form. Sf Log. Lower Carboniferous (Burlington Limestone) : 
Iowa, U.S.A. Keokuk Limestone : Indiana (Newberry). (?) Cleve¬ 
land Shale : Ohio. 
P. 2727. Tooth with much pointed eminences ; Augusta, Iowa. 
Enniskillen Coll. 
Orodus tenuis, Davis. 
1883. Orodus tenuis, J. W. Davis, Trans. Roy. Dublin Soc. [2] vol. i. 
p. 399, pi. li. fig. 14. 
Type. Detached abraded tooth ; British Museum. 
Founded upon a much abraded imperfect tooth, long and nar¬ 
row, with very high pointed median eminence, and with an angu- 
lated longitudinal median crest. Only two transverse wrinkles 
remain at the base of the median cone. 
Form. Sf Log. Lower Carboniferous Limestone : Armagh, Ireland. 
P. 2710. Type specimen. Enniskillen Coll. 
Orodus (?) gibbus, Davis. 
1843. Orodus gibbus, J. E. Portlock (ex Agassiz, MS.), Rep. Geol. 
Londonderry, p. 461 (name only). 
1883. Orodus gibbus , J. W. Davis, Trans. Roy. Dublin Soc. [2] vol. i. 
p. 396, pi. li. figs. 6, 7. 
Type. Detached teeth ; British Museum. 
A very doubtful species founded upon the teeth mentioned below. 
The median eminence is prominent and gibbous; there is no longi¬ 
tudinal crest, and the transverse wrinkles are reduced to small 
marginal crenulations. 
Form. Sf Log. Lower Carboniferous Limestone : Armagh, Ireland. 
P. 2704-5. Type specimens, the second very suggestive of a tooth 
of Psepliodus magnus. Enniskillen Coll. 
P. 2709. Three teeth regarded as probably belonging to this species 
by J. W. Davis, loc. cit. Enniskillen Coll. 
The following species have also been founded upon detached 
teeth, but there are no examples in the Collection :— 
Orodus alleni, St. John & Worthen, Pal. Illinois, vol. vi. (1875), 
p. 310, pi. vii. fig. 19.—Lower Coal-Measures; Iowa. 
Orodus carinatus , St. John & Worthen, op. cit. vol. vi. p. 307, 
pi. v. fig. 24.—Keokuk Limestone ; Iowa. 
Orodus colletti, J. S. Newberry, Ann. Rep. Geol. Surv. Indiana, 
1876-78 (1879), p. 343.—St. Louis Limestone; Indiana. 
Orodus compressus , F. M‘Coy, Ann. Mag. Nat. Hist. [2] vol. ii. 
