62 BRITISH SILURIAN BRACHIOPODA. 
rather broader than long; shell thin; surface grooved concentrically by a few inequi- 
distant, strongly marked lines of growth, and by numerous finer lines, which are distinct 
only on the sides of the shell. Length usually about } inch, width slightly more.” 
Obs. In external shape, the only specimen of the shell I have seen (the outlines of 
which are given in Dr. Holl’s paper) very strongly reminds me of O. plumbea.” It was 
found by Dr. Holl in the black shales, or upper division of the Lingula-beds, near Coalhill, 
at the east end of the Malverns. As no species are common to the new formations, 
“Lower Llandeilo” and ‘“ Lingula-flags,” we may, perhaps, keep them distinct. 
Mr. Salter believes that one or two more species of Odolella occur in the Lower 
Llandeilo of Wales; and of these he gives figures, without names, in the Appendix to 
Prof. Ramsay’s ‘Memoir on the Geology of North Wales ;’ they are from the “ Lower 
Llandeilo or Arenig Rocks” of Llanfaelrhys, South Caernarvonshire. The specimens are 
too obscure to warrant our reproducing them ; and Mr. Salter figures them only to draw 
attention to a rare genus. 
OsoueLLa? Pariurpsit, Holl. Pl. IV, figs. 17—19. 
OBOLELLA PuHiLLipsit, Holl. Quarterly Journal Geol. Soc., vol. xxi, pp. 101, 102, 
figs. 10, a, 6, 1864. 
Spec. Char. Shell small, semicircular ; hinge-line nearly straight, as broad as the 
breadth of the shell, or slightly shorter. Dorsal valve very moderately convex or depressed 
near the angles; ventral valve convex at the beak, which is slightly bent backwards, 
obtusely pointed, depressed near the margin. Surface marked with numerous fine con- 
centric strize, which are at intervals divided by a deeper line. Interior unknown. 
Length 4, breadth 5, depth 1 Ime. 
Oés. 'The species to which this Odoled/a ? is nearly allied, or which it most resembles, 
is Obolella (Kutorgina) cingulata, Billings ;* but the Canadian is many times larger than 
our British shell, and differs in several other particulars. Unfortunately, all the specimens 
1 «Geology of Canada,’ “Paleozoic Fossils,” vol. i, p. 8, 1861, Mr. Billings informs us that his O. cingulata 
was obtained at the Anse au Loup, on the north shore of the Straits of Belle Isle, in limestone of the Potsdam 
group; also abundantly, in the condition of casts, a mile and a half east of Swanton, in Vermont: and 
in a foot-note to p. 9 the same author observes—‘“ Since the above was written I have examined many 
casts of the interior of this species, and am inclined to the opinion that it is generically distinct from 
Obolella chromatica. From the very considerable elevation of the beak, the dorsal valve must have had an 
area, and probably a foramen. In one specimen there are two large oval impressions, faintly impressed, but 
still distinetly visible. There is no trace of the lateral scars ; and the form, notwithstanding the characters 
of the surface, conveys the idea of an Orthisina. Should, upon further examination, my suspicions turn out 
to be well founded, I shall call the genus Kurorerna, after the celebrated European naturalist Kutorga. It 
is not quite certain which is the ventral or which is the dorsal valve.”’ It appears to me very doubtful if 
Obolella Phillipsii belongs really to Odolella ; probably it must be placed in the group that will be typified 
by O. (Kutorgina) cingulata. 
