THE ANNALS 



AND 



MAGAZINE OF NATUEAL HISTOBY. 



[SIXTH SERIES.] 

 No. 28. APRIL 1890. 



XXXIX . — Descriptions of new and imperfectly -defined Species 

 of Jurassic Nautili contained in the British Museum 

 {Natural History). By ARTHUE H. FoORD, F.G.S., 

 and G. C. Crick, Assoc.R.S.M., F.G.S., of the Geolo- 

 gical Department, British Museum. 



In studying" the Jurassic Nautili in the British Museum it 

 became evident to us that many of the species required re- 

 vision, Sowerby's names especially having been used by 

 authors indiscriminately for forms which, on investigation, 

 were found to disagree materially with the types. It has been 

 our endeavour, with the aid of the excellent material furnished 

 by the National Collection (which contains many of Sowerby's 

 types), to give such definitions and figures of the species as 

 may conduce to their correct identification by future workers. 

 We have found it necessary to create some new species, 

 which have been derived chiefly from the rich Jurassic fauna 

 of Dorset and Somerset. Two species are included from the 

 Lias of France ; and we here record our indebtedness to Dr. 

 Paul Fischer, of the Museum of Natural History, Paris, who 

 with great kindness sent us some specimens from the d'Or- 

 bigny Collection to compare with those of the British Museum. 

 "We have also the pleasure to acknowledge the liberal assis- 

 tance rendered to us by the authorities of the Woodwardian 

 Ann. & Mag. N. Hist. Ser. 6. Vol. v. 20 



