Br. Wheelton Hind — British Carboniferous Nautiloids. 405 



The Distribution of British Carboniferous Nautiloids. 



By the late Wheelton Hind, M.D., F.R.C.S., F.G.S. 



WITH the exception of the Catalogue of Fossil Cephalopoda by 

 Foord in the British Museum (Natural History) and the 

 same author's monograph Carboniferous Cephalopoda of Ireland, the 

 bibliography of this family as represented in Carboniferous time 

 is scattered through many volumes and publications. Not one of 

 the publications makes any attempt to define the precise horizon 

 in the Carboniferous Series at which any one of the species occurs, 

 or indicates its persistence in geological time. 



It does not seem to be at all probable that the Nautiloids will 

 lend themselves as zone indices, in the way in which Ammonoids 

 do from Carboniferous to Jurassic times. On the other hand, 

 Nautiloids are well distributed throughout the Carboniferous Series, 

 and some species at least are confined to definite horizons. Hyatt's 

 classification of Cephalopod genera was adopted by Foord in his 

 monograph, and is followed in this paper. 



The table of distribution of British Carboniferous Nautiloids 

 shows that a comparatively large number of them are found in 

 the Millstone Grit and Upper Coal-measures, while the Pendleside 

 Series only possesses three species. The Carboniferous Limestone 

 and the Upper Dibunophyllum beds are fairly rich, and there is an 

 horizon very rich in them in the Upper Caninia beds of Ireland and 

 Kniveton. Little Island, co. Cork, must contain some beds of 

 Upper Dibunophyllum age, as demonstrated by the presence of 

 Coelonautilus planotergatus, Stroboceras sulcatum, Vestinautilus crassi- 

 marginatus. 



TABLE SHOWING DISTRIBUTION OF BRITISH CARBONIFEROUS 



NAUTILOIDS. 



Coal-measures. 



Temnocheilus carbonarius Foord. P. falcatus J. de C. Sow. 



tuberculatus Sow. armatus J. de C. Sow. 



concavus J. de C. Sow. rotifer Salter. 



Ephippioceras wildi Hind. Ccelonautilus ratvsoni Inglis. 



clitellarium J. de C. Sow. Stroboceras quadratus Fleming. 



costatum Foord. Solenocheilus cyclostomus Phillips. 

 Pleuronautilus pulcher Crick. globos2is Hind. 



costatus Hind. Cydonautilus umbilicatus Hind. 



Millstone Geit. 



Temnocheilus tuberculatus Sow. Stroboceras sulcatum J. de C Sow. 



Pleuronautilus pulcher Crick. Solenocheilus globosum. 



nodosocarinatus F. Romer. cyclolobum. 



Ephippioceras bilobatum Sow. 



Pendleside Series. 



Phacoceras oxystonium Phillips. Thrincoceras luidii Martin. 



Stroboceras .quadratum Fleming. 



