49 PROCEEDINGS OF THE NATIONAL MUSEUM. vot. xxxuv. 
Hall, in 1848, recognized Sowerby’s species (Orthis interlineata) 
in the New York Devonian, but later, as previously stated, assigned 
the name Orthis tioga to that form.¢ 
Davidson, in 1864-69 ®, again revised the British Devonian Dal- 
manellas and placed Phillips’s species O. parallela under O. inter- 
lineata as a-‘synonym. Healso recognized Phillips’s species O. arcuata 
as the name for the middle Devonian forms; and the upper Devonian 
forms were included under the name OQ. interlineata. 
C. F. Roemer (1844)° included the German Devonian Dalmanellas 
under the specific names Orthis testudinaria and Orthis testudinaria 
var. ventro-plana. 
These forms were later revised by Verneuil and Schnur. 
In the year 1845 Verneuil ¢ described the species Orthis opercularis, 
which closely resembles Hall’s species Orthis tioga. Verneuil calls 
attention also to its close resemblance to Orthis testudinaria Dalman, 
and expresses the opinion that the species is identical with the form 
described in 1844 by C. F. Roemer under the name Orthis testudi- 
naria, var. ventro-plana.< The Kifelien form described by Roemer 
under the name Orthis testudinaria, was referred by Verneuil to 
Sowerby’s species Orthis lunatas 
The specimen figured as the type of Orthis opercularis is from the 
Devonian limestone of the Eifel, and the form provisionally referred 
to the species from Russia is from the region of the Volkof River. 
Schnur, in 1853 described this species,’ but his figures give it finer 
surface lines than are represented on Verneuil’s figures. 
In 1850, Verneuil described the species Orthis dumontiana,' which 
also closely resembles a species from the New York Chemung, Orthis 
tioga Hall, 1867. The original specimen of O. dumontiana was found 
in the Devonian limestone of Alejé near Sabero, Spain. In this same 
paper (1850) Verneuil cites in the list of species coming from the 
Devonian rocks of the mountains of Léon and Asturia two species, 
Orthis gervilii Verneuil (MS.) and O. eifeliensis Verneuil (MS.), 
without descriptions. Sechnur, in the paper above cited, refers to 
and figures the second of these species,’ and it is clearly a Dalmanella. 
@Geol. N. Y., 4th Dist., 1843, p. 268. 
6 Brit. Dev. Brachiopoda, III, 1864-69, p. 91, pl. xvii, figs. 18-23, and p. 98, 
pl. xvi, figs. 13-17. 
¢ Rhein. Uebergangsgeb., p. 76, pl. v, figs. a, b, ec, d. 
@d Géologie de la Russie, II, Paléontologie (Edw. de Verneuil), 1845, p. 187, pl. 
Witt, iS, 2 GO, Os 
€ Rhein. Uebergangsgeb., p. 76, pl. v, figs. 6 c, d. 
fTdem, p. 76, pl. v, figs. 6 a, b. 
9 Géologie de la Russie, II, Paléontologie, p. 180. 
’ Zusammenstellung u. Beschreibung siimmtlicher im Uebergangsgebirge der : 
Hifel vorkommenden Brachiopoden. Paleontographica, III, 1853, p. 214. 
7 Soe. Geol. de France, Bull., VII, 2d ser., 1850, p. 181, pl. 1v, figs. 7 a, 0b, ¢. 
J Schnur, Paleontographica, III; 1858, p. 218, pl. xxxvit, figs. 6 a, b, ¢. 
Ss 
