24 SUPPLEMENT TO THE 



tlie spiral. The exceptional strength of the loop in the thickness of its lamellae, and in 

 its connection with the dorsal septum, may be designed to bear the long extension of 

 the accessory lamellae. 



The characters of this species being, therefore, so distinct from any previously dis- 

 covered, I have decided to give it the wew generic denomination of Kayseria, after Dr. 

 Emanuel Kayser, of Berlin, a distinguished palaeontologist, and author of the work 

 'Die Brachiopoden des Mittel- und Ober- Devon, der Eifel,' 1871. Most of the pre- 

 parations of Kayseria lens from which the figures are taken are from German specimens, 

 and in these the different parts of the loop, &c., are revealed opaquely and in very clear 

 relief against the yellowish limestone matrix. 



Eirst placed with Orfhis by Phillips, and then with Spirigerina by Sandberger, and 

 with Reizia by Quenstedt and Kayser, it now, thanks to Mr. Glass, finds a resting place in 

 Kayseria. It has also received several specific names besides its true one of lens. 

 Schnur called it dividua, Steininger Eifliensis, Sandberger ovalis. 



Kayseria lens is a well-marked species, easily recognised by its remarkably com- 

 pressed appearance, small beak, slightly-raised and flattened radiating ribs, with inter- 

 spaces of about equal breadth, and by a longitudinal groove dividing the shell into two 

 equal parts, hence Schnur's name dividua. The specific name of lens, however, given to 

 the species by Phillips in 1841, must be retained, that of dividua being one of the 

 synonyms. 



Kayseria lens is not a rare shell at Hope's Nose, near Torquay, but it is very difficult 

 to procure specimens in a good state of preservation. In the Eifel it is found in a 

 perfect condition. It is a small shell scarcely ever exceeding six lines in length. 



Genus — Atuyris, McCoy, 1841. 

 11. Athyris Glassii. Dav., Dev. Sup., PL I, figs. 21, 22. 



Shell small ; transversely oval, valves moderately convex, slightly compressed, without 

 fold or sinus, ventral valve the deepest and most convex ; beak produced, slightly incurved 

 and truncated by a minute circular foramen, separated from the hinge-line by a small 

 deltidium ; surface of valves smooth. In the interior of the dorsal valve the spiral appen- 

 dages have their extremities facing the lateral portions of the valves. About seven 

 convolutions in each spiral. 



Length 5, width 6, depth 2 lines. 



C^.9. — Of this small species four or five examples were procured by Mr. Whidborne 

 from the Middle Devonian of Luramaton, near Torquay. The interior spirals were 



