82 BRITISH SILURIAN BRACHIOPODA. 
or two from Wenlock beds at Ferriter’s Cove, County Kerry. A small specimen, 
probably referable to this species, was found by Mr. Brown in the Ludlow beds of 
the Pentland Hills. 
Crania Sinurtana, Dav. Pl. VIII, figs. 19, 20. 
Spec. Char. Shell marginally subquadrate or nearly circular, posterior margin nearly 
straight. Ventral valve adhering to marine bodies by its entire surface ; dorsal valve 
slightly conical or limpet-like; vertex subcentral, and closer to the posterior than to the 
anterior margin. ‘The interior of the attached valve shows the muscular scars peculiar to 
the genus Crania. Exterior surface rugose, or covered with more or less strongly marked 
concentric lines. 
Length 4, breadth 4 lines. 
Obs. Of this species I am acquainted with three individuals, which adhere to a 
specimen of Leptena Waltoni, from the Wenlock shales of Falfield. 
It is, however, exceedingly difficult to make a correct specific determination of these 
imperfectly preserved specimens ; for their external shape much resembles that of several 
forms of attached Cranie. 
Cranta? Grayu, Dav. PI. VIII, figs. 22—24. 
Spec. Char. Shell small, circular, or slightly longer than wide ; upper valve limpet- 
like, the apex being situated nearer to the posterior than the anterior margin; surface 
ornamented with a variable number of narrow cost radiating from the vertex, and 
increasing in number by the interpolation of one or two riblets between each two of 
the ribs ; the former originating at variable distances from the vertex, and extending to 
the margin. 
A large specimen measured 4 lines in length by about the same in width. 
Obs. Of this little shell I am acquainted with some nine examples. Six adhere to a 
specimen of Spirifera plicatella, var. radiata, found by Mr. John Gray in the Wenlock 
limestone near Walsall, and now in the British Museum. Three other specimens were 
picked up by Mr. L. P. Capewell in the Wenlock limestone near Dudley. Not having 
seen the interior of the adhering valve, the description of this species must necessarily be 
incomplete. It bears some resemblance to certain Jurassic and Cretaceous species of 
Crania, to which genus it is therefore provisionally referred. 
In addition to the species of Cranza above enumerated, another fossil was formerly 
described by myself under the designation of Crania Sedgwickii (Lewis, MS.), in the 
