30S 
SUPPLEMENT TO THE BRITISH 
with a liigli polish, and apparently very numerous, and close to eacli other on tlie lateral 
portions of the shell (Sup., PL XXXV, figs. 1, 2). Several examples of Produdus 
setnireticulafus have been found by Mr. J. Wright in the Carboniferous Limestone of 
Little Island, Cork, in which the margins of the shell are bent upwards at right 
angles to the plane of the shell, and forming, as it were, a fringe or band around it 
(Sup., PI. XXXVL fig. 12).^ 
38. Productus scabriculus, Martin, sp. Dav., Carb. Mon., p. 169, PL XLII, figs. 
5—8; Sup , PL XXXV, fig. 3. 
When describing this Productus at p. 170 of my Monograph I was not in possession 
of, or acquainted with, any specimens in which the spines were perfectly preserved, and 
stated that the slender curved spines were rather less than half an inch in length. 
Since then Mr. John Young has found large slabs with crushed specimens of Prod, 
scabricidus in the Lower Carboniferous Limestone of Trearne, Beith, Ayrshire ; showing 
long marginal fringes of attached, slender, curved spines, nearly two inches in length. 
A specimen about two inches in breadth had attached spines one inch and three quarters 
in length, and not much thicker than a hog's bristles (Sup., PL XXXV, fig. 3). These 
spines are of extreme delicacy, and from their vast abundance the shell must, when 
perfect, have been covered with them as close as a head of hair. Associated with this 
Productus, in the same limestone, were found immense numbers of specimens of Productus 
aculeatus with very similar spines. 
Productus scabriculus sometimes attains large dimensions. Mr. Aitken, of Manchester, 
has a specimen from the Carboniferous Limestone of Poolwash in the Isle of Man which 
measures — length 3 inches, width 3|, depth 1*2 lines. 
39. Productus griffithianus, de Koninck. Sup., PL XXXVI, fig. 6. 
LepTjENA — ?, M'Coy. Syn.of the Char, of the Carb, Limestone Fossils of Ireland, 
pi. xviii, fig. 11, 1844. 
Pkodxictus Gbiffithianus, de Kon. Monographie des genres Productus et Chonetes, 
p. 74 a, pi. xviii, figs. 7 a, I, 1S47 
Shell small, rarely exceeding five or six lines in breadth, by four and a half in length ; 
a little wider than long, transversely semicircular ; hinge-line rather shorter than the 
1 This character lias been already noticed by Quenstedt. See bis ' Zu den Bracbiopoden,' PI. Iviii, 
fig. 39, 1871. 
