360 BRACHIOPODA OF THE 



Mr. Sharpe's figured specimen of 0. Bussacensis measured — length 6, breadth 9 

 lines. They may, however, be variations of a same species. 



The striation in 0. Budleighensis varies also in different specimens, being closer, 

 finer, and more uniform in some examples, while in others the shorter and smaller striae 

 between each pair of the larger ones are more apparent. M. de Tromelin writes me 

 that in Bohemia M. Barrande refers one of his species from his horizon d 5 to 

 Orthis testudinaria of Dalman, but with a mark of doubt, that he has seen the specimens 

 so identified by the celebrated French palaeontologist, and that lie believes them to agree 

 with the 0. Filicerai of Rouault, or Budleighensis. 



Orthis Budleighensis is the most abundant fossil in the Caradoc pebbles of 

 Budleigh-Salterton. Dr. Carter, of that place, informs me that a pebble covered 

 with impressions of the exterior and internal casts of this species, found by 

 himself in 1835 (and which he has kindly presented to me), was perhaps the first inti- 

 mation of the presence of organic remains in the quartzite pebbles of the Old Beach at 

 Budleigh that was ever recognised. This Orthis occurs also in situ in light grey quartzite 

 at Gorran Haven, in Cornwall, where it was found by Mr. C. W. Peach, the first 

 discoverer of fossils in the Cornish Lower-Silurian Rocks. Other specimens were sub- 

 sequently found there by Mr. R. Etheridge, and deposited in the Museum of Practical 

 Geology in London. Similar quartzite pebbles in the Drift, and containing the same 

 fossil, have been found by Mr. Perceval at Sparkbrook, near Moseley, Birmingham, by 

 Mr. W. J. Harrison at Counterthorpe, about five miles south of Leicester, by Mr. 

 Jennings near Nottingham, and by the Rev. P. B. Brodie in the Drift near Warwick. 

 In his able memoir, published in the first volume of the third series of the Societe 

 Linneenne de Normandie, at p. 67, M. de Tromelin says : 



"It is known that 0. Budleighensis fills of itself whole beds at May, Jurques, 

 Campandre, Mont Robert (La Breche-au-Diable), but that at May the beds that 

 contain this species in abundance are below those that contain the greater number 

 of species of the locality. There is no reason, however, to believe that these beds 

 constitute a distinct zone ; for associated with these occur other fossils : also that 

 0. Budleighensis is less abundant in the sandstones of the North of the Department of 

 the Ille-et-Vilaine than in those of the Calvados ; that he has picked it up in Brittany, 

 at St. Germain-sur-Ille, La Lande de Baugi, La Bouexiere, Champeaux, &c ; that there 

 exists in the slaty schists a species which he has found it impossible to distinguish from 0. 

 Budleighensis ; that it is very abundant at Domfront, and at Andouille ; and that the 

 specimens from those localities cannot be distinguished from those of Bohemia, ' bande 

 db,' provisionally referred to 0. testudinaria. The same species occurs at La Hunandiere 

 (Loire-Inferieure) ; Morgat, near Crozon (Finistere) ; St. Denis d'Orgues ; at La Butte 

 du Creux (Sarthe) ; Brieux (Orne), &c." 



