220 
SELACHII. 
41201. Five more rounded teeth, with marginal concentric wrinkles; 
Lower Carboniferous Limestone, Tournai, Belgium. 
Purchased , 1868. 
P. 2619, P. 2646. About sixty teeth of similar form, but with 
smooth coronal surface and having the middle of the 
crown raised into a large rounded boss; Lower Car¬ 
boniferous Limestone, Armagh. Enniskillen Coll. 
P. 2912. Smaller tooth with a low lateral boss in addition to the 
median, described as Loiphodus gibber-ulus , Agass. sp., by 
J. W. Davis, Trans. Roy. Dublin Soc. [2] vol. i. p. 405, 
pi. li. fig. 19 ; Armagh. Enniskillen Coll. 
P. 2629. Six similar teeth ; Armagh. Enniskillen Coll. 
P. 2630-1. Two very large teeth, with delicate marginal concentric 
wrinkles, and with the sharp longitudinal coronal ridge 
raised into a pointed median apex, forming the type 
specimens of Helodus crcissus, J. W. Davis, loc. cit. ; 
Armagh. Enniskillen Coll. 
P. 2632. Twelve similar teeth; Armagh. Enniskillen Coll. 
P.1465. Three similar teeth ; Armagh. Egerton Coll. 
20324. Imperfect tooth ; Bristol. 
Purchased , 1847. 
P. 4914. Nearly similar tooth; Yoredale Rocks, Wensleydale, 
Yorkshire. Horne Coll. 
P. 2611. Tooth with concentric marginal wrinkles and the longi¬ 
tudinal ridge low and sharp, though rising to a median 
eminence, forming the type specimen of Helodus expansus, 
J. W. Davis, loc. cit. ; Armagh. Enniskillen Coll. 
P. 5862. Four teeth of the same kind, but less symmetrical; 
Armagh. Enniskillen CoTl. 
P. 2654 a. Three teeth, nearly similar, hut without the median 
eminence ; Armagh. Enniskillen Coll. 
P. 2653. Three similar teeth; Upper Carboniferous Limestone, 
Richmond, Yorkshire. Enniskillen Coll. 
P. 2651. Tooth of the same form, though slightly curved, resembling 
some of the teeth included by Agassiz in Chomatodus 
linearis , and described under this name by J. W. Davis, 
Trans. Roy. Dublin Soc. [2] vol. i. p. 508, pi. lxi. fig. 1; 
Bristol. Enniskillen Coll. 
