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SUPPLEMENT TO THE BRITISH 



The only difference between this and the preceding species mentioned by Mr. 

 Deslongchamps seems to consist in the large size of the beak, which is stated to be almost 

 straight in Sp. Hartmanni, or but slightly incurved, the area occupying almost the entire 

 width of the shell. The spiral appendages have an upward direction, with their 

 conical extremities curving towards the septum, and thus filling a large portion of the 

 cavity under the beak of the ventral valve, as seen in the figure, Sup., PI. XI, fig. 7. 

 This species (?) occurs, according to Mr. Deslongchamps, in the Middle Lias of South 

 Petherton, near Ilminster, and especially in the zones of Amnion. Davosi and Am. fimbriatus. 

 It is found in the localities where Sp. rostrata abounds. Mr. Deslongchamps admits 

 that it is sometimes difficult to distinguish it from certain varieties of Sp. rostrata ; 

 and, were it not for the stated modification in the direction of the spiral coils, I should 

 hesitate very much in admitting, even provisionally, its claim to be a species. 



Mr. Deslongchamps informs us that Sp. Hartmanni and the preceding species may 

 be collected in almost every part of Prance where the Middle Lias prevails, but is 

 especially abundant in the neighbourhood of Caen (Svrecy, Curcy, Landes, &c), Milhau 

 in the Aveyron, Avallon (Yonne), &c. Dr. Oppel sent me specimens from Pliensbach, 

 near Boll, in Germany, observing at the same time that the sinus is more deeply 

 excavated in Zieten's figure than in any of his specimens from that locality, and 

 that Zieten was mistaken when he assigned the age of the bed to that of the Oxford 

 Clay. 



35. Spiriferina pinguis, Zieten (not Sow.). Dav., Ool. Mon., p. 20, PI. II, figs. 



7_9. Sup., PI. XT, fig. 8. 



Spirifer mesoloba, Desl., MS. Soc. Linn, de Normandie, 1837. 



— pinguis, Zieten. Die Verst. Wurtemb., xxxviii, fig. 5, 1 842. 



Delthyris tumidus, VonBuch. Classif. et descrip. des Delthyris (Mem. Soc. Geol. 



de France), 1st ser., vol. iv, pi. x, fig. 29, 1840. 

 Spirifer chilensts, d'Orb. Darwin, South America, p. 267, pi. v, figs. 15, 16, 1846. 



— linguiferoides, d'Orb. Prodrome 267, pi. v, figs. 17, 18, 1846. 

 Spiriferina pinguis, d'Orb. Prodrome, p. 221, No. 150, Etage Sinemurien, 1847. 



— ostiolata, ed. Prodrome 239, No. 228, Etage Liasien (non Delthyris 



ostiolata, Zeiten, non D. ostiolata, Sohloth), 1847. 



— tumidus, Coquand et Bayle. Bull. Soc. Geol. de France, 2me ser., t. vii, 



p. 235, 1850. 



— rostrata var. pinguis, E. Desl. Bull. Soc. Linn, de Normandie, t. iii, 



p. 135, 1858. 



Spirifer tumidus, Quenstedt. Der Jura, p. 80, pi. ix, fig. 7, 1858. 



— pinguis, E. Desl. Etudes critiques sur des Brachiopodes nouveaux ou 



peu connus, p. 15, pi. ii, figs. 1 — 3, 1862. 



