214 
SELACRII. 
P. 1455 a. Six specimens, one associated with a tooth of Helodus 
didymus ; Armagh. Egerton Coll. 
P. 4888. Two dental plates only differing from the foregoing in 
their smaller size; Yoredale Bocks, Wensleydale, York¬ 
shire. Horne Coll, 
P. 5352. One imperfect specimen and fragment; Ticknall, near 
Melbourne, South Derbyshire. Wilson Coll. 
Beltoptyclmis gibbernlns, Davis. 
K S « |7> 01 or* 
1838. Cochliodus contortus, L. Agassiz, Poiss. Foss. vol. iii. p. 115, 
pi. xiv. figs. 21, 29-33. 
1862. I)eltoptychius gibherulus, Morris & Roberts, Quart. Journ. Geol. 
Soc. vol. xviii. p. 100 (name only). 
1883. Deltoptychius gibherulus, J. W. Davis, Trans. Roy. Dublin Soc. 
[2] vol. i. p. 435, pi. liii. figs. 18, 19. 
Type. Detached dental plates ; British Museum. 
“ Upper” dental plate much expanded posteriorly towards the inner 
border • the large coronal ridge broad, rounded ; lateral borders not 
raised into ridges. “ Lower ” plate with the large median ridge 
gently rounded and relatively broad; antero-lateral border raised 
into a sharp ridge. 
Form, Loe. Lower Carboniferous Limestone : Wexford, Ireland; 
Gloucestershire, Somersetshire, and Shropshire, England. Upper 
Carboniferous Limestone : Derbyshire. 
(i.) Slightly curved variety upper jaw), shown by Agassiz, tom. cit. 
pi. xiv. figs. 29-31, and by Davis, tom. cit. pi. liii. fig. 19. 
P. 2439. Type-specimen; Bristol. Enniskillen Coll. 
P. 2440. Five dental plates; Bristol. Enniskillen Coll. 
P. 5225. One specimen ; Bristol. 
Presented by J. E. Lee, Esq., 1885. 
P. 1478, P. 1452. Three similar plates ; Bristol. Egerton Coll. 
20575 b, 41167. Six specimens ; Bristol. Purchased, 18ro, 1868. 
40331. Three small dental plates; Clevedon, Somersetshire. 
Purchased, 1867. 
42189. Small abraded specimen; Oreton, Shropshire. Baugh Coll. 
P. 1478 a. Two specimens ; Hook Point, Wexford. Egerton Coll. 
23712. Three small specimens ; Hook Point, Wexford. 
Purchased, 1849. 
