Mesonacidæ of Comley in Shropshire, with a discussion of Classification within the Family

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Abstract
The trilobite family Mesonacidae was erected by Walcott (1890 b ) in his “Fauna of the Lower Cambrian or Olenellus Zone” for the genera Olenellus, Mesonacis , and their relatives, which especially characterize that rock series. The first discovery of a Mesonacid in Britain was made by C. Lapworth at Comley in Shropshire; and was recorded in 1888 in the Geological Magazine and in Nature , the species being named Olenellus callavei . In 1890 a short characterization of this species by him appeared in Walcott's above-mentioned monograph (p. 640), and Lapworth himself in 1891 described and figured the species under the name Olenellus ( Holmia ) callavei . In 1910 appeared Walcott's monograph on “Olenellus and other genera of the Mesonacidæ”. In this, Lapworth's species was illustrated and was referred to Matthew's genus Callavia , to which also was referred a new species from Comley, the characteristics of which were furnished by Raw, described below (p. 274) under Nevadia (Walcott, 1910, pp. 282–3, pl. 42, figs. 1–4). In this monograph were brought under review all the known examples of the family, many of them discovered and described by Walcott himself; and to it as well as to his previous and later papers all students of the family are indebted. Earlier than this Dr. E. S. Cobbold had commenced his intensive study of the Cambrian rocks and fauna of Shropshire, furnished not only in natural exposures and in quarries, but also by about sixty special excavations made by him, about half of which exposed Lower Cambrian rocks. In a

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