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SUPPLEMENT TO THE BRITISH 



" T. globata is one of those shells the continual variations of which render it most 

 difficult to describe." I endeavoured in PI. XIII to illustrate not only Sowerby's 

 original examples (figs. 2 and 3) now in the British Museum, but likewise what appeared 

 to me, at the time, some of its modifications in shape. Subsequently in his ' Die Jura- 

 Formation,' Dr. Oppel raised my specimen fig. 4 to the rank of a distinct species under 

 the designation of Ter. Eudesi, and made of fig. 7 his Ter. Fleischeri. After a careful 

 re-examination of the specimens I made use of when drawing up my description of 

 T. globata, it seems to me that the specimens from the Inferior Oolite of Dundry (fig. 4) 

 might be separated from T. globata proper, but I cannot help questioning whether the 

 more or less elongated form to which Oppel gave the name of T. Fleischeiri is more than 

 a modification of Sowerby's species. The specimens 6 and 7 from Birdlip were all found 

 together in the Inferior Oolite, and it is easy to perceive when dealing with a number of 

 individuals that some of them became more elongated than others, but without diverging 

 from the essential characters belonging to the species. Mr. J. P. Walker seems to think, 

 and I will not assert he may not be correct, that the Birdlip form (Supl., PI. XVII, fig. 1) 

 should be considered a variety of the typical form from Nunney, near Prome (Min. Con., 

 tab. 436, fig. 1), although I am at a loss to define the difference. 1 



Mr. Lycett observes at p. 134 of his Handbook on the Cotteswold Hills, when treating 

 of T. globata, that " The Cotteswold variety " (my Sup., PI. xvi, fig. 1) " of this shell differs 

 materially from the typical or Dundry type " (the shell subsequently named T. Eudesi by 

 Oppel), " and as it occurs in immense abundance through the upper beds of the Inferior 

 Oolite, extending the whole range of the Cotteswolds, the difference is worthy of notice. 

 The figure of the Cottesw r old variety is more elongated, the anterior folds being very 

 strongly defined. Between this form and T. Phillipsii the transition is so gradual, that after 

 the inspection of a good connecting series of specimens confidence in the specific value of 

 T. Phillipsii is much lessened. Pine typical examples of T Phillipsii do not occur higher 

 up than the " Pimbria-stage " of the Inferior Oolite, where it is rare. Another constant 

 companion of T. globata, and nearly resembling it, is a form usually attributed to a small 

 variety of T. perovalis ; equally abundant with T. globata, its only distinction consists in 

 a more depressed form and smaller anterior folds. In this instance, not less than in T. 

 Phillipsii, we find the same gradual transition in form." Mr. E. Deslongchamps, in 

 vol. 2 of the ' Bulletin of the Linnean Society of Normandy,' informs us that the specimens 

 from the " Calcaire de Caen " are very similar to those found in England. Those of the 

 " Oolithe blanche " are more flattened and wider, and the two folds are more separated ; 



1 Mr. C. Moore informs me by letter, " I have gone over tbe ground between Nunney and Frome dozens 

 of times and have never seen a Brachiopod. The only bed of Inferior Oolite is just by Nunney, and it is not 

 open. It occurs in patches on the Carboniferous Limestone. The horizon of the T. globata would be that 

 of Dundry. I should be inclined to think that the T. bullata, especially as Soweiby states it comes 

 from the same locality, is a variety of T. ylobata." The Inf. Ool. may, however, have yielded forms in 

 1823, when Sowerby described his species. 



