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DESCRIPTION OF TWO NEW SPECIES OF LAMELLIBRANCHS FROM 
MARINE BANDS OF THE YORKSHIRE COALFIELD. 
BY WHEELTON HIND, M.D., B.S., F.R.C.S., F.G.S. 
{Manuscript received lUh November, 1908.) 
AviCTJLOPECTEN CuLPE>ri, sp. nov. Plate XL., Figs. 1 and 2. 
Specific Characters : — Shell small ; quadiate. The left 
valve moderately convex. The hinge luie straight, produced 
and pointed posteriorly. Ears large, deep, and well defined, 
the anterior with six deeply-impressed radiatmg grooves separated 
by ridges ; the posterior concave, with one central, thin, radiating 
ridge and numerous fine concentric striae ; its margin arcuate. 
The body of the valve is ornamented with many radiating, sharp 
raised, equidistant, slightly nodulose ribs, some of which start 
at the umbo, but as they become separated in their passage 
across the shell, new ones arise between each pair. 
The right valve has a somewhat similar ornament, but 
the radiating lines are much finer and the whole valve is 
much flatter. 
Dimensions : — A left valve measures : Antero-postcriorly, 
12 mm. ; Dorso-ventrallj^, 12 mm. 
Localities : — Brodsworth and Bentley. 
Observations : — Mr. Culpin has been fortunate enough to 
find a left valve of this shell at both Brodsworth and Bentley. 
It belongs to the group of A. tabulotus, being characterised by 
a very long spur along the upper border of the posterior ear. 
The Bentley specimen shows the external ornament. The 
Brodsworth specimen is the interior of the valve and has the 
ears perfectly preserved. I figure a specimen with two valves 
from Bentley. 
ScALDiA CARBON ARIA, sp. nov. Plate XL., Fig. 3. 
Specific Characters : — Shell small, orbicular, gibbose. Margin 
formed by a single curve which passes from the anterior 
extremity of the hinge line without anj^ break to the posterior, 
the curvature becoming somewhat flattened along the posterior 
