1869. ] DAVIDSON—PEBBLE-BED BRACHIOPODA. 77 
Lingula Brimonti, Rouault? (according to Salter), Quart. Journ. 
Geol. Soc. vol. xx. p. 293, pl. xvii. fig. 6. 
I believe this shell to have been correctly identified, although no 
figure was given by the French paleontologist. Some French ex- 
amples in the possession of M. de Verneuil, however, are much larger 
and more transverse than any hitherto collected at Budleigh. I am 
also of opinion that the shell doubtfully identified by Mr. Salter as 
L. Brimonti (Rouault)is no more than a malformation of L. Hawket. 
It is, according to M. Rouault, a Lower-Silurian species. 
4, Linevta? Satrert, Day. PI. IV. fig. 5. 
Sil. Mon. p. 53, pl. i. figs. 27-29, 1866. 
I must here repeat what I said when describing this curious spe- 
cies, namely, that whether it belongs to Lingula or Obolus, or to some 
other genus is a question which the material at my command will 
not enable me to determine ; for none of the specimens showed any 
portion of their interior. It much resembles Lingula? exilis, Hall 
(13th Annual Report of the Regents on the state of Cabinet, p. 76, 
New York, 1860), a shell occurring in the Hamilton group and 
Marcellus shale of Bridgewater, New York. Prof. Hall’s specimens 
measured about an inch in length, while an example of L. Salteri 
found by Mr. Vicary had attained 2 inches; it may therefore remain 
a question whether the American and British specimens do or do 
not belong to a single species. 
Although figured and described in my Silurian Monograph, I 
cannot say whether it is a Silurian or a Devonian species, as no other 
known shell has been found with it in the same pebble. I should 
feel inclined to suppose it Devonian, from its strong resemblance to 
L. exilis. 
Besides the four species of Lingula above recorded, one (Pl. IV. 
fig. 4) or two specimens, which might perhaps be referable to another 
type, have been picked up by Mr. Vicary; and of one of these a 
drawing will be found in pl. 1. fig. 31 of my Silurian Monograph. 
5. Disctna? Vicaryi, Dav. Pl. IV. fig. 6. 
Sil. Mon. p. 67, pl. vu. fig. 13, 1866. 
Three or four examples of this Discina(?) have been obtained by 
Mr. Vicary; but, as 1 have never seen the attached valve, I cannot 
say positively that it belongs to the genus to which it is provisionally 
referred, nor can I locate it in either the Silurian or Devonian 
series with any degree of certainty, because no other known species 
has been found with it in the same pebble. 
6. Discrna incerta, n. sp.? Pl. IV. fig. 7. 
Shell nearly orbicular; apex one-third of the diameter from the 
margin; upper valve moderately convex. Length 33, breadth 3, 
height 1 line. 
This shell is apparently rare; and it is not possible to identify it 
