On Three new Species of Lamellibranchiata from the Carboniferous Rocks of Great Britain

Open Access
Publisher Website
Google Scholar
Abstract
I . On a new species of Anthracomya , from the Upper Coal Measures of North Staffordshire. Introduction.—I n my monograph on Carbonicola, Anthracomya , and Naiadites I pointed out that only one lamellibranch was then known to occur in the Upper Coal Measures of North Staffordshire, and indeed of Great Britain. The comparative sections illustrating the distribution of the Lamellibranchiata in the various coalfields showed that in a large number of them the highest known lamelli-branch was Anthracomya Phillipsii , and that this species might well be considered characteristic of a certain zone. Since the date of that publication I have been able to accumulate material from a series of beds in the North Staffordshire and Lancashire coalfields much higher than the A. Phillipsii -zone , which contains a hitherto undescribed fossil shell, evidently referable to the genus Anthracomya . This species appears to characterize also a certain somewhat narrow zone of calcareous shales and freshwa~r limestones which occur towards the top of the Coal Measures in these localities. The shells from Fallowfleld were collected by Mr. Rceder. They are free from the matrix, and, although often fragmentary, afford distinct details of the hinge. I am not sure whether there are not at least two distinct species from the Fallowfield beds, but hesitate to erect a new species on mere fragments. A nthracomya calcifera , sp. nov. (P1. XXV, figs. 14-20.) Secific Deseription.—Shell small transversely, modioliform, very inequilateral, gibbose, expanded and flattened posteriorly, oblique. The anterior end is very short, and narrower than the rest of

This publication has 0 references indexed in Scilit: