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SUPPLEMENT TO THE BRITISH 



Dr. Schloenbach considers T.faba, Sow., T. Dutempleana, D'Orb., and T. sulcifera, 

 Morris, to be synonyms of T. biplicata, or varieties. We must, however, differ from him 

 with respect to T. sulcifera. Mr, Meyer is of opinion that the specimens I have figured 

 as T. biplicata (PI. VI, figs. 45 to 49, and PI. IX, figs. 36, 37) should be considered 

 to be varieties of T. sella. 



Terebratula biplicata exceeds two inches in length in the Red Chalk of Hunstanton, 

 as well as in the Gault of Eolkstone. In the Upper Greensand at Warminster it becomes 

 still larger. In the Red Chalk of Speeton it is rare (Rev. T. Wiltshire). I am not certain 

 whether it occurs above the Grey Chalk and lower down than the Gault. It is a very common 

 species in the Upper Greensand of Ese, near Monaco, the specimens found there being 

 exactly similar to those that occur at Cambridge. I have specimens also from the Gault 

 of the Perte du Rhone ; Goudiniere ; Grand Bernard ; Glacier du Breton (Savoie) ; Grand 

 Pre, Escragnolles (France) ; and many other places. Specimens from the Upper Greensand 

 of Vivortier (Oise) and the Chloritic Chalk of Rouen exactly agree with those that are 

 found at Warminster. 



Terebratula sella, Soiv. 



This is a very variable and perplexing species. Mr. Meyer, who has devoted much 

 attention to its study, informs me by letter that " there appears to be a considerable 

 difference in the form of T. sella of the lowest and the highest beds of the Lower 

 Greensand : those obtained from the 'Perna-bed ' at Atherfield, Peasemarsh, &c, have 

 their edges acute and the front much elevated ; this form being well represented in PI. 

 VII, fig. 4, of your Monograph. The T. sella of the upper beds at Shanklin have their 

 edges much less acute, the front less elevated, the beak more elongated, and the valves 

 more equally convex (PI. XIV, figs. 9 — 12). They vary very much among themselves. 

 The resemblance of some of these varieties to several forms of D'Archiac's Tourtia species 

 struck me on a former occasion as being not a little singular, and, as far as a comparison 

 with figures can be trusted, I should say that D'Archiac's figures of T. Roemeri, Bouei, 



the name Anomia biplicata; and they published in the 'Bulletin of the Geol. Society of France,' 

 2nd ser., vol. xix, p. 160, 1861, the results of their examination. They subsequently went to San 

 Quirico, in Tuscany, and, after a minute inspection of the strata, arrived at the conclusion that the Tere- 

 bratula in question could not have been obtained from the locality named by Brocchi. On their return to 

 Paris they submitted the specimen itself to M. E. Deslongchamps, who assured them that Brocchi's fossil 

 belonged to the Jurassic period, and that after a minute comparison he had arrived at the opinion that the 

 Anomia biplicata of Brocchi and the Terebratula indentata, Sow. (from the Lias) belonged in all pro- 

 bability to the same species, but that on account of the beak being incomplete, and from the absence of all 

 positive knowledge respecting its stratigraphical position and locality, as well as generic allocation, it 

 would be desirable that Sowerby's name, biplicata, should be retained for the Upper-Greensand shell, and 

 that of indentata, Sow., for the Liassic species. — (Deslongchamps, ' Pal. Frang., Brachiopodes Jurassiques,' 

 p. 133.) 



