358 BRACHIOPODA OF THE 



Salter's " Porambonites" sp. ( { Quarterly Journal Geol. Soc.,' vol. xx, p. 295, pi. xvii, 

 fig. 9), may be a large internal cast of the dorsal valve of 0. pulvinata. 



0. pulvinata is not nearly so abundant as 0. Berthoisi, var. erratica, in the Sandstone 

 and quartzite pebbles of Budleigh-Salterton. M. de Tromelin informs me that 0. 

 pulvinata occurs in company with 0. Berthoisi, var. erratica, at Saint Germain-sur-Ille, 

 La Bouexiere, Champeaux (Ille-de-Vilaine), and in other places. 



40. Orthis BudleiCxHENsis, Dav. Sil. Mon., p. 224, PI. XXVIII, figs. 6—9 (as 



0. redux) ; B. S. Sup., PL XLI, figs. 12—20; 

 and PL XLII, figs. 16—25. 



This species has given M. de Tromelin and myself very much trouble, research, and 

 uncertainty ; and several so termed distinct species, evidently the same, have received 

 different names, so that much confusion has ensued. I am not yet satisfied that it may 

 or may not be the Orthis Filicereei of Rouault ; l never having seen any of the Vitre 

 specimens, and no figure of the species having been given by M. Rouault, I cannot speak 

 positively either one way or the other. Although M. de Tromelin believes that 0. 

 Budleighensis is the same as 0. FUicerai, he states in his memoir, " Etudes de la Eaune 

 du Gres Silurien de May, Jurques, Campandre, Mont-Robert, &c, Calvados," ' Bull, de la 

 Soc. Linn, de Normandie,' 3 ser., vol. i, 1876-7, that unfortunately the specimens found 

 in the schists of Vitre are very much out of shape. I will, therefore, at any rate provi- 

 sionally, continue to make use of the name Budleighensis, as the characters of the species 

 so named have been very clearly defined on a multitude of perfectly preserved specimens. 



So like, indeed, are some examples of 0. Budleighensis to Orthis testudinaria of 

 Dalman, that it has been identified with it by several palaeontologists. 2 Feeling very 

 uncertain upon the subject, I forwarded to Prof. Lindstrom a number of casts of 0. 

 Budleighensis from May and Budleigh-Salterton, and asked him to compare them atten- 

 tively with Dalman's series of typical examples of 0. testudinaria from the Lower 

 Silurian marl of Borenshult, in Ostrogovia, that are preserved in the Museum of 

 Stockholm ; and his reply was : " I cannot decidedly say that the English specimens are 

 identical with Dalman's 0. testudinaria ; they are more finely striated and more trans- 



1 'Bull. Soc. Gcol. de France,' 2nd ser., vol. viii, p. 366, 1851 :— " Orthis Filicercei, Marie Rouault : 

 La forme de cette petite espece est presque circulaire. L'area est neanmoins assez developpe en largeur; 

 la valve dorsale [this is the ventral one of modern palaeontologists] est convexe a l'endroit du crochet qui 

 est tres marque, celle ventrale [our dorsal] de forme plus applatie ; toutes deux sont couvertes par des 

 stries larges et tres saillantes, dichotomies pres du bord et non arquees sur les cotes. Localite — Vitre." 



2 In their memoir, " Sur la Geologie d'Almaden, Spain " (' Bull. Soc. Geol. de France,' 2nd ser., 

 vol. xii), MM. de Verneuil and Barrande describe, under the name of Orthis testudinaria, Dal. (pi. xxvii, 

 fig. 9, 1856), an Orthis identical with the O. Budleighensis of May and Budleigh-Salterton, and add O. 

 Bussaccnsis, Sharpe, as a synonym. 



