a cm ( 
Vol. 58.] CAMBRIAN BRACHIOPODA OF THE MALVERN HILLS, 139 
given. With no knowledge of its internal characters, the generic 
reference is necessarily provisional, but the species approaches 1n 
outline and external characters some American forms of the genus 
Obolella, especially the type-species of the genus, 0. chromatia, 
Bill., of the Olenellus-zone of Canada, from which, however, it 
appears to be separated by the form of the beak and the shape 
ot the umbonal region. In any case it seems better, until the 
two forms can be directly compared, to keep them distinct. I have 
been unable to differentiate satisfactorily between the pedicle- and 
brachial valves, but the valve figured is probably brachial, while the 
pedicle-valve seems to be rather more pointed. The ornamentation 
is not unlike that of the associated Kutorgina. 
I had at first some doubt whether this species might not be 
the imperfectly known Lingula squumosa of Holl, a form from the 
Hollybush Sandstone described (but without a figure, owing to 
the fragmentary nature of the specimens) in Quart, Journ. Geol. 
Soc. vol. xxi (1865). But Holl described his species as having 
imbricating growth-lines, an acute beak, and a truncated front ; 
moreover, the figure given by Davidson,! which was an attempted 
restoration of some of Holl’s fragments, shows a quite differently 
shaped shell. 
OBOLELLA (?) Satrert, Holl. (Figs. 3-6, p. 138.) 
_ 1865. Obolella Salteri, Holl, Quart. Journ. Geol. Soc. vol. xxi, pp. 101 & 102, 
Se ? Obolella Salteri, Davidson, ‘ Brit. Silur. Brach.’ Monogr. Paleeont. Soe. 
p. 61 & pl. iv, figs. 28 & 29. 
1871. Obolella Salteri, Phillips,‘ Geol. of Oxford & the Valley of the Thames ’ 
p. 68, diagram xvii, fig. 11. 
Cf. 1882. Obolus Salteri, Brégger, ‘Die Silur. Etagen 2 u. 3 im Kristiania- 
gebiet u. auf Eker’ p. 44 & pl. x, figs. 10 & 11; also figs. 12 & 13 (as Lingula sp.). 
Description.—Valves slightly convex, subcircular to broadly 
ovate in contour, some examples about as long as wide, others rather 
wider than long. Sides and front well rounded. Beak of pedicle- 
valve marginal and more pointed than that of the brachial valve. 
Shell thin; surface covered with numerous fine concentric lines of 
growth, which at intervals are.more strongly marked. 
Internal casts reveal little respecting the muscular impressions. 
Two internal casts of brachial valves from the Grey Shales exhibit a 
triangular elevation beneath the umbo, bisected by a median depres- 
sion, and show the impression of a hinge-area(?). These casts are 
also covered with very fine and inconspicuous radial striations, a 
feature which does not appear on corresponding external casts 
(compare fig. 5a with 56), and is therefore an internal character 
only. Another internal cast (fig. 6, from the Grey Shales), which 
I refer to this species with much hesitation, shows a pair of elongate 
lateralscars and a central muscular area—in these features resembling 
species of the genera Lingulella, Lingulepis, and Obolella. 
1 < Brit. Silur. Brach.’ Monogr. Palzxont. Soc. (1866) pl. ii, fig. 7. 
