ON FOUR NEW CARBONIFEROUS NAUTILOIDS AND A GONIATITE NEW TO GREAT BRITAIN

Abstract

(Plates III.—VII.) ( Read March 4 th, 1910.) INTRODUCTION. The specimens which form the subject matter of this paper have either been collected by or loaned to me for study and description. Some of them have been in my hands for years, during which I have compared them with figures and descriptions of most of the described Carboniferous species. I have also had the advantage of showing the specimens to Mr. G. C. Crick, of the Natural History Museum, and of conferring with him on their structure and affinities. During the last year I have been able to learn that my specimens were not unique, but that other examples of the same genera and species were extant in public and private collections, it therefore seemed to me that it was a fitting time to publish descriptions and figures of them and to revise any previous work germane to the subject. In three cases figures of a sort had been published, under generic and specific names, which denoted characters, widely different, from those which belonged to the specimens, all of which were unaccompanied by descriptions. Two specimens, each of a different genus, were referred to Nautilus cyclostomus, Phill., and the other specimen, though figured, was not described or allotted a specific name. One specimen has characters which separate it from all known genera. It has therefore been necessary in this case to erect a new genus for this species for which I propose the name Cyclonautilus. SOLENOCHEILUS GLOBOSUS, SP. NOV. (Plates III., …