BRITISH DEVONIAN BRACHIOPODA. 21 



and a shoe-lifter process. Mr. Glass was able to develop its spiral appendages in two 

 or three examples, but could not, owing to the intractable nature of the matrix, 

 expose its loop, rings, and attachments to the hinge-plate. I must, therefore, refer the 

 reader for the full description of the genus Merista to the Silurian Supplement. The 

 loop and its attachments were subsequently well developed by HerrZugmayer in a closely 

 allied species, the Merista cassidea-prunulum, of Quenstedt, from the Devonian rocks of 

 the Eifel. The rings of the loop and the shoe-lifter process characterise this genus. 

 Merista pleheia or scaljjrmn occurs in the Middle Devonian at Lummaton, and in the 

 dark shaley limestone at Hope's Nose, near Torquay ; but, unfortunately, in the last- 

 named locality most of the specimens are compressed and distorted. Some weathered 

 examples show the spirals, and a section exhibited the shoe-lifter process in a very 

 distinct manner (Dev. Sup., PI. I, figs. 28, 29). 



At p. 551 of his 'Die Brachiopoden der Eifel,' Dr. E. Kayser gives the following 

 synonyms of Merista plebeia. Sow. sp. Atrypa lacryma. Sow. Tereh. scalprum, E. 

 Roemer. Tereh. prunulimi, Schnur. 



Judging from specimens and figures. Von Buch's Merista {Ter.) cassidea is closely 

 allied to M. plebeia, but the shell named and figured Merista cassidea-prunulum by 

 Quenstedt, ' Brachiopoden,' tab. 51, fig. 69, seems very distinct from Sowerby's T. 

 plebeia, although it may belong to the same genus. 



Genus — Kayseria, Dav., 1SS2. 



10. Kayseria lilths, Fkillips, sp. Dav., Dev. Mon., PI. X, fig. 1; and Dev. Sup., 



PI. II, figs. 11, 12. 



Atrypa lens, Bav. Dev. Mon., p. 51, PL X, fig. 1. 



Spihigeiiina ovalis, Sundb. Verstein. Rhein. System in Nassau, pi. xxxiii, fig. 2, 



1855. 

 Retzia dtvidua, Quenstedt. Atlas, Brachiop., pi. 51, figs. 21 — 25, 1871. 



— LENS, Kayser. Die Brachiop. des Mittel- und Ober- Devon, der Eifel, p. 161 

 (Deutschen Geol. Gesel. Jahrgang, 1871). 



At page 21 of my ' Devonian Monograph ' I described this small species under the 

 name of Atrypa lens, and mentioned that Schnur had figured its spirals. His figure, I 

 find after further examination, shows two spiral appendages with their extremities directed 

 towards the lateral margins of the shelV and he draws five convolutions in each spiral. 

 Subsequently Quenstedt, in his 'Brachiopoden,' tab. 51, figs. 21 — 23, 1871^ gives 



^ ' Besclireibung Eifel-vorkonimenden Brachiopoden,' pi. xxiv, fig. 2, 1853. 



