On some Palæozoic Ostracoda from the District of Girvan, Ayrshire

Publisher Website
Google Scholar
Abstract
§ 1. Introduction. This paper aims at the completion of the palæontological account of the Girvan district, so far as the Ostracoda are concerned; and follows up the researches indicated in the 'Monograph of the Silurian Fossils of the Girvan District in Ayrshire,' by Nicholson and Etheridge, Jun., vol. i. 1880. In about a dozen pieces of the fossiliferous shales, submitted for examination some few years ago, the writer finds nearly thirty specimens (chiefly casts) of Primitia , Beyrichia , Ulrichia , Sulcuna , and Cypridina , which show interesting gradations of form, not always easy to be defined as specific or even varietal, but valuable as illustrating modifications during the life-history of individuals, thus often leading to permanent characteristics of species and genera. Like those formerly described in Nicholson and Etheridge's' 'Monograph,' the specimens have all been collected by Mrs. Elizabeth Gray of Edinburgh. Excepting a small cast of a Beyrichia Kleedeni , M'Coy, B. Kloedeni , var. scotica , Jones & Holl, and Ulrichia Grayce , Jones, which are of Llandovery age, from the Burn leading to Bargany Pond, all the specimens here described are from the dark-grey Lower-Silurian (Middle-Bala) shales of Whitehouse Bay. See Dr. C. Lapworth's Memoir on 'The Girvan Succession,' Quart. Journ. Geol. Soc.vol. xxxviii. 1882, pl. xxv. fig. 3 (map); fig. 16 at p. 595; and pp. 597, 603, 606, 612, 621, and 661. The numbers attached to Mrs. Gray's little hand-specimens are here inserted, together with the character of the shale in which the Ostracoda occur, for each species. § 2. Description

This publication has 0 references indexed in Scilit: