BRITISH SILURIAN BRACHIOPODA. 105 



of the Eifel. He has worked out the spirals, attachments to the hinge-plate, loop, 

 rings, and shoe-Kfter process ; and these, although apparently differing slightly in minor 

 details from what we find to be the arrangements in M. Herculea, have all essential 

 characters the same. Herr Zugmayer writes me that the specimens from the Eifel 

 are very difficult to examine, as only in very few cases he has found them to contain a 

 suitable or workable matrix. 



8. Merista ? Circe, Barrande (?). Dav., Sil. Mon., PI. X, figs. 33—35. 



At p. 116 of my Silurian Monograph I described and figured a small spiral-bearing 

 Brachiopoda as the Meristella Circe of Barrande. In 1881 I asked Mr. Barrande to 

 kindly send me some typical examples of his species, and the Rev. Norman Glass dis- 

 covered rings in one specimen and the shoe-lifter process in another. 



Until English specimens referred by myself with much uncertainty to Barrande's 

 species have been developed, nothing can be stated as to the probability of our English 

 so-called M. (?) Circe being the same as Barrande's Merista Circe. 



The English shell we have provisionally referred to Merista Circe occurs in several of 

 our localities of Wenlock Limestone and Wenlock Shales, such as Dudley, Holyhead, 

 near Walsall, in the Woolhope Limestone, &c. Any gentleman possessing or able to 

 procure duplicates of the shell would render a service to science in sending them to the 

 Rev. Norman Glass at Manchester, that he may be able to develop its interior so as to 

 ascertain the ffe7ius to which it belongs. A species similar to our own occurs also in 

 rocks of the same age in the Island of Gothland ; and although Dr. Lindstrom kindly 

 sent to me three or four examples, Mr. Glass was unable to work out their interiors. 

 Renewed efforts may be more successful : all that is required is suitable material to 

 operate upon. 



G^e;22^s— Meristella, Hall, 1860. Dav. Sil., Sup., PI. V, figs. 7, 8, 9. 



Thirteenth Annual Report of the University Regents on the Condition of the State Cabinet of Natural 

 History, 1860 ; and Pal. of New York, vol. iv, p. 295, 1867. Type Meristella arcuata. Hall. 



The genus Meristella was proposed by Prof. Hall for several species of Brachiopoda 

 possessing a very peculiar internal arrangement of the process or loop by which the two 

 spiral coils are connected. 



