PETALOBONTIDa;. 
53 
Form, if Lot. Lower Carboniferous Limestone ; Armagh, Ireland. 
Carboniferous Limestone: Shropshire {Bainn), Derbyshire (McCoy). 
P. 3000-2. Specimens figured by J. W. Davis, Trans. Koy. Dublin 
Soc. loe. cit . ; Armagh. Ennislcilhn Coll. 
P. 3003. Twenty teeth ; Armagh. Enniskillen Coll. 
P. 3004. Twelve teeth ; Tynan, Armagh. Enniskillen Coll. 
P. 1443. Six teeth ; Armagh. Egerton Coll. 
28538, 28735, 28921, 28927, 38504. Twenty-two broken teeth; 
Armagh. Purchased. 
The following species have also been founded upon detached teeth, 
but there are no examples in the Collection : — 
CUnoptyehius acuminatus : Pristodas'I acuminatus, St. John & 
Worthen, Pal. Illinois, vol. vi. (1875), p. 402, pi. x. a. fig. 6. 
— Kinderhook Limestone ; Iowa. 
Ctenop>tychius hellulvs-. Ctenopetnlus bellulus, St.John & Worthen, 
tom. cit. p. 398, pi. xii. fig. 9. — St. Louis Limestone ; Iowa, 
Illinois. 
Ctenoptychius ceympactus ; llarpacodus compactus, St. John & Wor- 
then, tom. cit. p. 355, pi. x.a. fig. 1. — Chester Limestone; 
Dlinois. 
Ctenoptychius elegans : Serratodus elegans, L. G. de Koninck, Faune 
Calc. Carbf. Belg. pt. i. (1878), p. 54, pi. vi. fig. 12. — U. 
Carboniferous Limestone ; Visd, Belgium. 
Ctenoptychius lirnatvlus: Ctenopetalus liniatulus, St. John & Wor- 
then, tom. cit. p. 399, pi. xii. fig. 18. — Chester Limestone ; 
Illinois. 
Ctenop>< ychius medius'. Ctenopetalus medius, St. John & Worthen, 
tom. cit. p. 400, pi. X.A. fig. 26. — Chester Limestone ; lUi- 
nois. 
Ctenoptychius oceidentalis'^ ■. Ctenopetalus oecidentalis, St. John & 
Worthen, tom. dt. p. 401, pi. xii. fig. 14. — Lower Coal- 
Measures ; Iowa. 
Ctenojitychius pertenuis, St. John & Worthen, tom. cit. p. 382, 
pi. X. A. fig. 27. — Chester Limestone ; Illinois. 
Ctenoptychius semicirctdaris, Newberry & Worthen, Pal. Illinois, 
' If, as the present writer considers, the tooth described by St. John & Wor- 
then (tom. cit. p. 355, pi. x.a. fig. 2) as Harpacodus oecidentalis must be placed 
in Ctenoptychius, and if these two species are distinct from all others, one will 
require a new specific name. 
