166 SUPPLEMENT TO THE BRITISH 



Sowerby, however, seems to have confounded two or three species under his designa- 

 tion of T. ornithocephala. The type fig. 1 (Sup., PL XXII, fig. 1) is stated to be from 

 the Cornbrash ; figs. 2 and 4 from the Blue Lias. I obtained from the late Mr. J. de C. 

 Sowerby the loan of the three original specimens figured in Tab. 101 of the ' Min. Con.' 

 (now in the British Museum), and was able not only to compare them attentively, but 

 to make faithful drawings which will be found reproduced in my plates. Of the three 

 figures attributed by Sowerby to T. ornithocephala, fig. 1 is stated to be from the Corn- 

 brash and derived from the same locality as T. obovata, fig. 5 of same plate. Figs. 2 

 and 4 are labelled from the Blue Lias, and are of a greenish colour. Eig. 2 has been 

 with some uncertainty referred by Mr. E. Deslongchamps to Ter. punctata ; and fig. 4 by 

 Mr. R. Tate to T. Sarthacensis, but surely not to d'Orbigny's species, for that palaeonto- 

 logist, at p. 258 of his ' Prodrome ' (vol. i, 1847), quotes it in the following manner : 



" Terebratula Sarthacensis, d'Orb. 1847 = T. ornithocephala, Sow., pi. 101, fig. 5 

 (exclus., figs. 1, 2), and no mention is made of fig. 4; therefore, according to d'Orbigny, 

 T. Sarthacensis would be a synonym of T. obovata. The specimens of Sarthacensis in that 

 author's collection, at the Jardin des Plantes, do not belong to the Cornbrash species, 

 and it is therefore probable that he had fig. 4 in view as the type of his species. Prof. 

 Tate may be nearer the mark when he refers fig. 4 of ' Min. Con.' to T. perforata, Piette ; 

 but he is not quite correct when stating, at p. 418 of. the ' Yorkshire Lias,' that Sowerby's 

 T. ornithocephala, pi. 101, fig. 5, comes from the Blue Liassic Marls of Pickeridge Hill, 

 south of Taunton ; and he no doubt intended to say fig. 4, as fig. 5 unquestionably 

 belongs to T. obovata. Mr. Tate is again mistaken when he supposes that my figure 

 (' Ool. Mon.,' PI. V, fig. 16) was intended to represent fig. 4 of the ' Min. Con.' In the 

 description of the figure I said, " from one of the original specimens of T. obovata in 

 Sowerby's collection." If Mr. Tate had referred to my description of T. obovata he 

 would have found that I did not quite overlook the original type fig. 5, to which I alone 

 refer. 



In 1816, in his ' Strata Identified ' Smith figures a Terebratula from the Kelloway 

 Rock under the name of T. ornithocephala. Sow., with locality Dauntsey House, Thames 

 and Severn Canal, near Chippenham, and this may, perhaps, be referable to W. 

 umbonella. W. ornithocephala occurs abundantly, and in a fine state of preservation, in 

 the Fuller's earth Oolite in England, as well as on the Continent ; and it is from that rock 

 that the most characteristic and abundant specimens of the species have been derived. 



As stated elsewhere, T. triquetra, Sow., is only a slightly indented variety of W. 

 ornithocephala. W. lagenalis, W. sublagenalis, W. umbonella, W. lampas, and W. 

 Cadmonensis are, according to Mr. E. Deslongchamps, distinct species. Their distin- 

 guishing characters are, however, sometimes difficult to define, and many passage-forms 

 can be procured by which they may be connected to a greater or lesser extent, especially 

 by half-grown specimens. 



