CESTEACIONTIDjK. 
235 
into a ssries of more or less rouiiietl eminences by deep transverse 
furrows. Median coronal eminence very large and prominent, dome- 
shaped, with an apical point from which radiate short delicate 
wrinkles. The sides of the crown are marked by large rounded, 
transverse plications, which are sometimes beaded, and often extend 
nearly to the apices of the lateral eminences. 
Form. Lor. Lower Carboniferous Limestone : Armagh, Ireland. 
Upper Carboniferous Limestone : Yorkshire, England. 
P- 2719-21. Type specimens ; Armagh. EnnisMllen Coll. 
P. 2714. Twelve broken teeth ; Armagh. Some show the beaded 
character of the transverse wrinkles ; and in two there 
are indications of a longitudinal beaded crest. 
Ennishillen Coll. 
P. 4903. Typical tooth; Yoredale Rocks, Wonsleydalo, Yorkshire. 
Horne Coll. 
P- 2718. Specimen described by J. W. Davis, loe. cit., as 0. oriiatus ; 
Richmond, Yorkshire. hnnislcillen Coll. 
Orodus mammillaris, Newberry & Worthen. 
lf^06. Orodus mammillaris, XewbeiTy & Worthen, Pal. Illinois, vol. ii. 
p. 0(5, pi. iv. lig. 10. 
'Fype. Detached tooth. 
Teeth scarcely distinguishable from those of 0. moniliformis, 
by the greater proniinonco and more beaded character of the trans- 
verse plications upon the median eminence. 
Form. ^ Loe. Lower Carboniferous (Keokuk Limestone) : Illi- 
nois, U.S.A. 
P- 2728. Three imperfect teeth ; Warsaw, Illinois. 
Enniskillen Coll. 
P- 2 <16. Small narrow tooth, perhaps of this species; Wansaw. 
Enniskillen Coll. 
Orodus elegantulus, Newberry & Worthen. 
18C(j. Orodus elegantulus, Newberry & Worthen, Pal. Illinois, vol. ii. 
p. 64, pi. iv. fig. 6. 
(P) 1876. Orodus elegantulus (P), J. S. Newbenw, Rep. Geol. Surv. Ohio, 
vol. ii. pt. ii. p. 61, pi. Iviii. tig. 12. 
I87tt. Orodus elegantulus, J. S. Newberry, Ann. Rep. Geol. Surv. In- 
diana, 1876-78, p. 346. 
Type. Detached tooth. 
Teeth very similar to those of 0. moniliformis and 0. mammillaris, 
but with the transverse wrinkles short and faintly marked. 
