On the Trimerellidæ, a Palæozoic Family of the Palliobranchs or Brachiopoda

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Abstract
I. Bibliography of the Trimerellids. The important group of shells forming the subject-matter of this memoir is, comparatively speaking, of recent acquisition in palæontology; for, though two of its species were made known in 1853, under the designations of Obolus Davidsoni and O. transversus *, it is only of late years that a beginning was made towards gaining a correct view of its remarkable internal features. So little understood were the interiors of these species at first, that they were confidently, but erroneously, referred to the genus Obolus by one of the present writers. Billings did not escape the same error when he described his Obolus canadensis †. The next stage, one decidedly in advance, was gained by Billings, who, finding some Canadian specimens with a singular interior, was led to institute a new genus for them under the name Trimerella -observing, at the same time, that it “is allied to Obolus , but from which it differes in the possession of longitudinal septa”‡. He erred again, however, in describing anaother species of the present family under the name Obolus galtensis § In 1867, Lindströ published an important paper, describing some specimens found in the Island of Gotland as far back as 1859, and which he had no hesiation in referring to the genus Trimerella of Billings, throwing at the same time further light on the internal sturcture of the group. He also referred to some specimens of the so-termed Obolus Davidsoni which had been discovered in the same island.* for the first time, in

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