234 
SELACH1I. 
Form. Sf Log. Lower Carboniferous Limestone : xlrmagh, Ireland. 
P. 2722-24. Type specimens. Enniskillen Coll. 
P. 2725. Five teeth, two much abraded. Enniskillen Coll. 
Orodus catenatus, Davis. 
1843. Orodus catenatus , J. E. Portlock (ex Agassiz, MS.), Rep. Geol. 
Londonderry, p. 461 (name only). 
1883. Orodus catenatus , J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. i. p. 395, pi. li. fig'. 5. 
Type. Detached tooth ; British Museum. 
Teeth comparatively small, the type specimen only measuring 
0-008 in length. Coronal contour gradually rising to the median 
eminence, which is almost pointed and strongly wrinkled ; longitu¬ 
dinal crest slightly divided into a series of small eminences, from 
each of which diverges a. prominent, transverse, bifurcating wrinkle 
on either side. 
Form, Log. Lower Carboniferous Limestone : Armagh, Ireland. 
P. 2715. Type specimen. Enniskillen Coll. 
P. 2715 a. Imperfect tooth, and three teeth associated in series. 
Enniskillen Coll. 
Orodus tubercuiatus, Newberry & Worthen. 
1866. Orodus tubercuiatus , Newberry & Worthen, Pal. Illinois, vol. ii. 
p. 66, pi. iv. fig. 9. 
Type. Detached tooth. 
Teeth small, short, the coronal contour gradually rising to the 
pointed median eminence ; lateral portion of crown on each side 
faintly divided into two or three small eminences. Coronal surface 
completely ornamented with large wrinkles, diverging from the 
apices. 
Form, df Log. Lower Carboniferous (Burlington Limestone): 
Illinois and Iowa, U.S.A. 
P. 2729. Tooth ; Burlington, Iowa. Enniskillen Coll. 
Orodus moniliformis, Davis. 
1883. Orodus moniliformis, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. i. p. 398, pi. li. figs. 10-12. 
1883. Orodus ornatus, J. W. Davis (non Newberry & Worthen), tom. 
cit. p. 397, pi. li. fig. 9. 
Type. Detached teeth ; British Museum. 
Teeth much elongated, of small size, having the crown divided 
