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BRITISH DEVONIAN BRACHIOPODA. 



In 1840, 1841, and 1845, M. de Verneuil adopted the terms 0. connivens, and that 

 of 0. resupinaia var. striatula, for the Devonian form, but in 1847 and 1850 preferred the 

 name striatula, and consequently considered the Carboniferous and Devonian forms to be 

 distinct. The Devonian species does not appear to have attained anywhere the propor- 

 tions of the Carboniferous 0. resupinata, but examples of the same dimensions of both 

 forms cannot be distinguished j thus, for example, if the reader will compare our illus- 

 trations of 0. striatula with that of 0. resupinata in PI. XXX, fig. 1, of my ' Carboniferous 

 Monograph,' the external resemblance or identity will appear to him undisputable. More 

 difference may, however, be perhaps observable in the details of the interior arrangement 

 of both forms. Thus, if the reader will refer to PI. VII, figs. 131 and 135, of my ' General 

 Introduction,' which represent the interior of the dorsal valves of 0. resupinata and 

 0. striatula, he may, perhaps, perceive sufficient difference to warrant him in at least 

 provisionally retaining the two names for the shells under consideration, and until it can 

 be clearly ascertained whether those differences are constant. It is, however, very possible 

 and probable that 0. striatula is a smaller variety of 0. resupinata ; or, in other words, 

 that the last-named shell is only a more fully developed variation of the Devonian form. 

 0. striatula occurs in the shape of internal casts in the Middle Devonian at Hagginton Hill, 

 near Ilfracombe, also in the Limestone of Woolborough quarry, near Newton Abbot ; at 

 Barton, Lummaton, and Hope's Nose, near Torquay. It has also been noticed in the 

 Upper Devonian of South Petherwin, in Cornwall. 0. striatula is a common Devonian 

 shell on the Continent, it occurs in various Russian and Ural localities ; in the Eifel, at 

 Bensberg, Paffrath, and Ratingen in Prussia ; at Eerques, Nehou, Vire, and Arnao, in 

 France ; in the Hartz ; the Asturias, &c, in Spain ; in Nassau, &c. It has also been 

 found in Persia; the^United States, &c. 



Orthis hipparionix, Vanuxcm (?). PI. XVII, figs. 8 — 11. 



Hipparionyx proximus, Vanuxem. Nat. Hist. N. York ; Geol. Report of the Third Dis- 

 trict, p. 124, fig. 4, 1843, and Orthis hipparionix, Vanuxem. 

 Orthis hipparionyx, Schnur. in Meyer und Dunker's Palseontographica, vol. iii, 



p. 217, pi. xl. fig. 1, 1853. 

 — — J. Hall. Nat. Hist, of New York; Palaeontology, vol. iii, p. 407, 



pi. lxxxix, figs. 1 — 4 ; pi. xc, figs. 1 — 7 ; pi. xci, figs. 4 

 and 5, and pi. xciv, fig. 4, 1859. 



In the Lower Devonian slates and grits of Looe, in Cornwall, we very commonly meet with 

 large internal casts, which resemble much in shape and character those of Orthis hipparionyx 

 .of American authors ; but as the shell itself no longer exists in our rocks, and as only small 

 portions showing impressions of the external surface could be obtained, we cannot feel 

 quite certain as to our identification. These casts are also much put out of shape by 



