93 
ANIMALIA—Class BRACHIOPODA. 
Fam. Obolid^e. 
Genus Obolus, Eichwald. 
Obolus obovata, Chapman sp. 
Siphonotreta obovata, Chapman, 1904, Rec. Geol. Surv. Viet., vol I., pt. 3, 
p. 222, pi. XXI., fig. 1. 
Siphonotreta discoidalis. —Idem, ibid., p. 223, pi. XXI., figs. 2, 2a. 
Observations. —The mould of the shell formerly described as Siphonotreta 
discoidalis shows a distinct impression of a pedicle channel which is apparently 
open. The shell was smooth but for the fine concentric markings. The mould 
(spec. 22) is now found to be the counterpart of spec. 3, and as the latter, 
named obovata, is the first figure on the plate, this name now stands for both 
fossils. 
Relationships. —The above species reminds one of Obolus parvus, Walcott, 1 
a Lower Cambrian fossil of the Canadian Rocky Mountains, from which it 
differs in its more regularly rounded form and deeper valve. 
Genus Lingulella, Salter. 
Lingulella australis sp. nov. Plate VI., figs. 2, 2a. 
Description. —Shell ovate, longer than wide, depressed. Beak acuminate. 
Anterior margin broadly rounded. Surface with fine and coarse concentric 
lines, the latter resembling folds in the shell. 
Dimensions. —Length, 3 * 66 mm. ; greatest width, 2 • 66 mm. 
Relationships. —A nearly allied form to the above is Lingulella lepis. Salter 
sp. 2 from the Lingula Flags and Tremadoc Beds (Upper Cambrian) of Wales. 3 
The British specimens differ in having uniformly fine concentric striae and no 
folds on the shell. 
( Genus Leptobolus, Hall. 
Leptobolus truncata, sp. nov. Plate VI., figs. 3, 3a. 
Description. —Pedicle valve subtrigonal in outline ; lateral and anterior 
margins widely curved. Apex, sub-acute. Pedicle channel extensive ; 
diverging septa and muscular scars well pronounced. Surface marked by 
fine concentric growth-lines. 
Dimensions. —Length, 3’33 mm. ; width, 3*5 mm. 
Relationships. —The small size and divergent septa point to the affinities 
of this oboloid shell with Leptobolus. The nearest allied form is perhaps 
Leptobolus occidentalis, J. Hall, 4 a fossil of the Utica Group (Ordovician) of 
New York State. 
Fam. AcROTRETIDiE. 
Genus Acrothele, Linarsson. 
Acrothele subquadrata, sp. nov. Plate VI., figs. 4, 4a. 
Description. —Ventral valve subquadrate in outline. Apex slightly 
posterior to the centre of the valve. Lateral margins curving towards the 
false area, which is triangular, slightly concave, and bordered by lines 
radiating from the apex to the posterior margin. Surface from the apex to 
the anterior margin well arched. Shell-surface marked with distinct 
concentric lines of growth. 
1 Smithsonian Misc. Colls., vol. LIII., No. 1810, 1908, p. 61, pi. VIII., figs. 10, lOn. 
2 Mem. Geol. Surv. Gt. Brit., vol. III., 1866, p. 334, fig. 11. Davidson, Mon. Brit. Sil. Brach. (Pal. 
Soc.), 1866, p. 54, pi. III., figs. 54-58. Id., Geol. Mag., Dec. I., vol. V., 1868, p. 307, pi. XV., figs. 10-12, 
3 The Tremadoc Beds are generally regarded either as Cambrian or as a passage series between the 
Cambrian and the Ordovician. Kayser and Lake, in the Text-book of Comparative Geology (p. 51), place 
it in the Ordovician. 
4 Twenty-fourth Report N. York State Mus. Nat. Hist., p. 227, pi. VII., fig. 18. 
