23i 
Aviculopecten granosus, Soioerhy. 
PL XXII, Pig. 10. 
JPecten granosus, J. de C. Sowerby, 1829, Min. Concb., YI, p. 141, pi. 574 , fjg. 2. 
55 55 J- Pliillips, 183G, Geol. Yorkshire, II, p. 213, pi. 6, fig. 7. 
55 55 F. McCoy, 1844, Synop. Carb. Poss. Ireland, p. 93. 
Aviculopecten granosus. Idem, 1855, Brit. Pal. Poss., p. 486. 
This is a plano-convex shell, rounded in form (if the ears be omitted) 
and capable of reaching a somewhat large size. The beak of the right valve is 
thick and recurved in front. The hinge line is longer than the antero-posterior 
diameter of the valves. The surface is ornamented with from twenty-five 
to thirty radiating, very thick, folds, covered from one extremity to the other 
with small imbricated lamellm ; between each pair of these folds, and at a 
little distance from the beak, arises a smaller, thinner, and nearly smooth 
fold. The surface of the flat valve is also ornamented with folds, alternatelv 
thick and thin, corresponding with those of the convex valve, but without 
the imbrications. The anterior ears are rounded at the extremities, and 
separated from the rest of the shell by the byssal notch ; the posterior ears 
end in a tapering point, and are separated from the body of the shell by a 
slight depression, and their extremity is united to the posterior margin by a 
decided curve. 
Dimensions. — These dimensions are taken from a nearly perfect Belgian 
specimen, the characteristics of which are identical with those of the 
Australian specimen ; — length four, breadth three, thickness one, centimetres. 
Relations and Differences. — This species is closely allied to my A. 
Duniontiamis, but it differs by its less oblique form, and by its radiating 
folds being more crowded, numerous, and rugose. 
Horizon and Loealities. — A. granosus was found by Mr. J. de Carle 
Sowerby in a black limestone in Queen’s County, Ireland. Mr. Dupont found 
it abundantly in the limestone of Wanlsort, which belongs to his Bed IV of the 
Carboniferous Limestone. Two specimens were found by Mr. W. B. Clarke ; 
one in a greyish-yellow limestone at Duguid’s Hill, and the other in a 
greyish-yellow argillaceous limestone at Burragood, associated with Rrachy- 
metopus Strzelechiii McCoy. 
