214 
SELACHII. 
P. 1455 a. Six specimens, one associated with a tooth of llelodus 
didymus ; Armagh. Egerton Coll. 
P. 4888. Two dentil! plates only differing from the foregoing in 
their smaller size; Yoredale Rocks, Wensleydalo, York- 
shire. Coll. 
P. 5353. One imperfect specimen and fragment; Tiokuall, near 
Melbourne, South Derbyshire. Wilson Coll. 
Deltoptychius gibberiilus, Davis. 
1838. Cochliodm contortus, L. Agassiz, I’oiss. Foss. vol. iii. p. 116, 
pi. xiv. figs. 21, 29-33. 
1802. IJeltojitycMu? yihhet'vlu^ Morris tS; Roberts, Quart. Journ. Cieol. 
Soc. vol. xviii. p. 100 (name only). 
1883. Ddtoptychius (jibbendiis, S.W . Roy. Dublin Soc. 
[2] vol. i. p. 436, pi. liii. tigs. 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 
riiised into ridges. “ Lower ” plate with the largo median ridge 
gentl}' rounded and relatively broad; antero-lateral border laised 
into a sharp ridge. 
Form. 4- Loc. Lower Carboniferous Limestone : Wexford, Ireland ,: 
Cloucestershiro, Somersetshire, and Shropshire, England. Upper 
Carboniferous Limestone : Derbyshire. 
(i.) Slightly curved variety {2 tqiper jaw),shown by Agassiz, tom. cit. 
])1. xiv. figs. 29-31 , arid by Davis, tom. cit. pi. liii. fig. 19. 
P. 2439. Type-specimen ; Bristol. Ennislcillen Coil- 
's. 2440. Five dental plates ; Bristol. EmiisHllen 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. UiOT'/insetf, 1815, 1868. 
40331. Three small dental plates; Clevedon, Somersetshire. 
Purchased, 1867. 
42189. Small abraded specimen ; Orcton, Shrop.shire. Baugh Coll. 
P. 14^8 a. Two specimens ; Hook Point, Wexford. Egerton Coll. 
23712. Three small specimens ; Hook Point, Wexford. 
Purchased, 1849. 
