BRITISH DEVONIAN BRACHIOPODA. 27 



Genus — Bifida, Bav., 1882. 



14. Bifida lepida, Goldfuss, sp., apud d'Arch. et de Vern. Dav., Dev. Mon., PI. X, fig. 



2; and Dev. Sup., PI. 

 II, fig. 13. 



Tebebratula lepida, (VArchiac and de Verneuil. Desc. of the Fossils of the Older 



Deposits of the Rheinish Pro- 

 vinces, Trans, Geol. Soc., 2ad 

 ser., vol. vi, p. 368, pi. xxxv, 

 fig. 3, 1840. 



Atbypa — Dav. Mon. Brit. Dev. Brachiopoda, p. 52, pi. x, fig. 2, 1864. 



Eetzia — Kayser. Die Brach. des Mittel- und Ober-Devon. der Eifel, 



p. 559, 1871. 



At page 52 of my ' Devonian Monograph ' I described and figured the exterior 

 characters of this little shell, under the name of Atrypa lepida. I was not then acquainted 

 with its interior arrangements. In 1871 Prof. Quenstedt, in his ' Brachiopoden,' 

 Tab. 51, fig. 29, gives a small figure of the interior from a specimen from the 

 Devonian Limestone of Gerolstein, which he had been able partially to develop. In 

 his figure the spiral appendages are shown in their dorsal aspect, the extremities of 

 the spirals being directed towards the lateral margins of the shell, and each spiral 

 being composed of three convolutions. Quenstedt, however, gives none of the attach- 

 ments, either of the principal stems with each other or with the hinge-plates. In 1871, 

 Dr. E. Kayser placed Goldfuss's species in the genus Betzia, but he does not seem to 

 have been acquainted with either its attachments to the hinge-plate or its loop. In 1880 

 Mr. G, P. Whidborne forwarded to Mr. Glass a number of small specimens of this species 

 which he had procured at Hope's Nose, near Torquay. Dr. E, Kayser and Prof. Dewalque, 

 at my request, also kindly procured for Mr. Glass a number of foreign specimens from 

 Gerolstein, in the Eifel, and some more examples from the same locality were kindly sent 

 to Mr. Glass by Mr. Whidborne. From these specimens Mr. Glass was enabled to work 

 out most completely the internal spiral arrangement. This result, however, was only 

 obtained after repeated efforts and much patient application, the shells being very small, 

 and the only possible method of revealing their interior being by means of transparency. 



In the shape and position of the spirals and in the attachments to the hinge-plate 

 this genus closely resembles Whiff eldia, only the spirals of Bifida are slightly depressed 

 or flattened on their dorsal side. There are usually four coils in each spiral. The loop 

 is like that in Meristina, with the exception that it is placed nearer to the attachments to 



