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The Atrypidae of New South Wales, with references to those recorded from other states of Australia

1920; Linnean Society of New South Wales; Volume: 45; Linguagem: Inglês

10.5962/bhl.part.19546

0370-047X

Jonathan M. Mitchell, William Sutherland Dun,

Study of Mite Species

that he had identified this species in a collection of fossils from New South Wales whicli had been sent to the Woodwardian Museum of Cambridge University by Clarke in 1844 for description.*In 1877 its presence is noted by Prof, de Koninckt from Kempsey. and the banks of the Murrumbidgee [Devoniair] .With regard to the Kempsey locality there is considerable doubt, the formations in that area being of Upper Palaeozoic age.In 1888 the species was reported from the Bowning Beds.lIn 1880 R. Etheridge, Jr., recorded A. reticularis from Bombala, and the variety aspera froiii Collins Flat.N ormal specimens of this fossil from the Bowning-Yass Beds, exclusive of their foliated margins, appear to be rather smaller than the European species.The dimensions of one of the largest specimens from these beds are^length and width, 20 mm., depth 11 mm.Judging from the figures of A. reticularis in Davidson's British Brachiopoda, it would apjsear that adult British species usually exceed an inch in length and width, and are more gibbous than our forms.The pedicle valves of our specimens too seem less convex in the umbonal region, and more concave laterally and anteriorly.Some specimens from Wellington Caves, N.S.W., have been obtained of relatively large size, their length and width exceeding 43 mm.without the fringe, with a thickness of 26 mm.In these specimens the radial ribs are coarse, and the marginal sinus in front deep and tonguelike, but, except for their unusual size, their external and internal features, as far as they are revealed, are quite typical of the normal A. reticularis.In tlie upper beds of the Bowning Series, a form occurs, possessing features which would place it about midway between A. aspera and A. i\eticularis, and although these features are unvarying in all the specimens of it that have come under our notice, we deem it undesirable to separate it from the type form at present.Vide PL xvi., fig.13.The stratigraphical range of the species in the Bowning Series extends practically from base to summit ; but it is most abundant in the lower beds of the series especially in those of Hatton's Corner and the limestones of Limestone Creek, Silverdale.Its associates in these beds are Barrandella linguifera var.wilkinsoni Eth., Bhizophyllum interpunctatum de Koninck, Encrinurus mitchelli Foerste, Bronteus jenkinsi E. and M., etc.Loc. and horizon.-Hatton's Corner, Yass River, Parish of Y'ass, County Mur-