BUDLEIGH-SALTERTON PEBBLE-BED. 359 



verse. At the utmost I would put them down as a variety of 0. testudinaria, but I do 

 not feel I am quite justified in doing so." Prof. Lindstrom, in order to assist me in my 

 examination, kindly forwarded to Brighton three of Dal man's typical specimens, and I 

 give a figure of one of them for reference, see fig. 26 of the Plate XLII, devoted to 

 Cornish Lower-Silurian species. 



In 1864 Mr. Salter identified the species under description with the OrtMs reduce 

 of Barrande. At p. 224 of my Silurian Monograph I followed the same erroneous 

 view, but in 1869 (' Quart. Journal Geo!. Soc.,' vol. xxvi, p. 83) I said, 

 " although this shell was identified by Mr. Salter with 0. redux (Barrande), both M. 

 de Verneuil and myself entertain misgivings as to the correctness of the identification. 

 The Bohemian Silurian species is not well known ; the internal cast only has been 

 figured by Barrande." I then proposed to name the shell Orthis redux, Barrande ? 

 var. Budleighensis. 



In 1877 M. de Tromelin observes, in his paper already referred to, that he had, up 

 to 1877, in accordance with the views of every other author, considered the Orthis that 

 occurs at May, in Normandy, as a local type of 0. redux, while expressing doubt as to 

 the correctness or reality of the identification ; that since then, by the inspection of real 

 Bohemian specimens of 0. redux, he had found that his doubts were well founded, and 

 consequently that in his new publications he had retained for the species of May the 

 specific name of Budleighensis, which I had given to it when supposing it a variety of 0. 

 redux; and in a subsequent letter he informs me that in Orthis redux the smaller dorsal valve 

 is much more convex, the striae much more equal or uniform in size, and the interiors 

 very different, 1 Having obtained, through the liberality of M. Barrande, four examples 

 of his 0. redux, I was able to fully confirm the statements and views expressed by M. 

 de Tromelin upon the subject. 



Orthis Budleighensis is very variable in shape. It is sometimes marginally quite 

 circular, and as broad as long (B. S. Sup., PI. XLI, fig. 15), and in that condition seems 

 to be undistinguishable from Orthis testudinaria; but it is more often transverse, or wider 

 than long, and some examples in that condition are exactly similar to the figure given by 

 Sharpe in the ' Quarterly Journal of the Geological Society of London,' vol. ix, pi. viii, 

 fig. 3, 1853, of his Orthis Bussacensis ; but other specimens of the same species in the 

 collection from Portugal, in the Museum of the Geological Society of London, are so very 

 much larger than any of the May or Budleigh-Saltcrton specimens of 0. Budleighensis that 

 I could not feel certain as to their identity. The largest specimen of Orthis Budleighensis 

 I have seen from May and Budleigh-Salterton measured — length 6^, breadth 9 lines. 



1 In his memoir on the ' Sandstones of May,' above quoted, at p. 7$ M. de Tromelin gives the following 

 list of the Brachiopoda he had obtained from that celebrated locality, viz.: — 1. languid Morierei, Troni. 

 2. Orthis Budleigheiisis, Dav. 3. O. Berthoisi, var. erratica, Dav. 4. O. exornata, Sharpe. He did not 

 find the true O. redux of Barrande at May ; but he states that he found one specimen referable to the 

 species at the Breche-au-Diable, in Normandy, as well as some in similar beds at St. Germain, La Bouexiere, 

 and Champeaux, in Brittany, where the species is not uncommon. 



