SPIRIFERID &. 85 
p. 90, pl. v, fig. 7, quoted by Salter with doubt at p. 381 of the ‘Memoirs of the 
Geological Survey,’ vol. ii (1848), must be, with his own consent, given up. That 
figure (see our Pl. X, fig. 12, a, B) is, in the twelfth edition of the ‘Systema Nature,’ 
named by Linnzeus Anomia crispa. Some difficulty may yet remain in the way of our 
being perfectly certain as to what Linnzus intended as the typical form of his Anomia 
plicatella, for his short description—“ longitudinally striated along with the ribs, lateral 
angles expanded,” is unaccompanied by a figure. In the Linnean Cabinet may, however, 
be seen two specimens marked by Linnzeus 4. plicatella, one of which exactly agrees with 
the definition of the species subsequently termed Delthyris cyrtena by Dalman, and 
Spirifer interlineatus by Sowerby, and which we must consequently regard as the typical 
shape of the Linnean species. At p. 194 of his ‘ Brit. Pal. Fossils,’ Prof. M‘Coy states, while 
describing Sp. cyrtena, “This species seems to me totally distinct (when typical forms are 
considered) from the Spirifer radiatus of Sowerby, by its very strongly costated valves ; 
and for the same reason it agrees perfectly with Dalman’s Delthyris cyrtena, which has 
usually been referred to the Sp. radiatus of Sow., although it is his Sp. interlineatus which 
presents the mixed costated and lineated character of Dalman’s species.” But Prof. 
M‘Coy seems not to have been aware of Linnzeus’s prior name, and of the original speci- 
mens preserved in the Linnean cabinet, or he would probably have adopted the designa- 
tion plicatella, placing Sp. cyrtena and Sp. interlineata as synonyms. Messrs. Salter and 
Lindstrém seem to have forgotten the characters of the Linnean type when they propose 
that Spirifer radiatus, Sow., should be considered the type as well as a synonym of the 
true An. plicatella ;' but they appear to me correct in deciding that Spirifera plicatella, 
Sp. interlineata, Spirifer radiatus, and Sp. globosus are all varieties of a single species ;” 
1 At p. 127 of Hanley’s ‘Ipsa Linnei Conchylia’ (1855) we find the following observations, which 
we reproduce, that the reader may be in possession of all the facts in connection with the identification of 
this important species : 
“<The Spirifer delineated in our plate (4, fig. 2) is preserved in the box thus marked ‘ Anomia plicatella’ 
in the Linnean Cabinet, and perfectly agrees with the definition of the species. Mr. Salter recognised it as 
Spirifer plicatellus, var. interlineatus, and Mr. Davidson as the Delthyris cyrtena of Dalman, which he regards 
as identical with the interlineatus of Sowerby. Besides the shell figured, there is also, in the same drawer of 
the Linnean collection, a specimen of Spirifer interlineatus (Sowerby, ‘Sil. Syst.,’ p. 6, fig. 6), which has 
fine longitudinal strie covering rounded ribs, though in other respects a very different species from that 
figured. This throws a slight doubt upon the shell to be chosen for Linnzeus’s 4. plicatella ; but the 
expression ‘ Strie in plicarum cavitatibus’ is so exactly applicable to the shell figured, which is smooth at 
the top of the ribs, while in the interlineatus the ribs are entirely covered with striz, that we must adopt 
the former for the veritable species. Iam not certain it has ever been delineated, unless Dalman’s Delthyris 
eyrtena, found in the Silurian rocks of Gothland, should be identical with it. The Terebratula 
plicatella of Dalman belongs to another genus, as does the 7’. plicatella of the ‘ Mineral Conchology.’ 
(Sharpe MSS.)” 
2 At p. 265 of the 2nd vol. of Prof. J. Hall’s ‘ Paleontology of New York,’ 1852, we find the following 
interesting observations : 
““M. de Verneuil cites (“ Note sur le Parallelisme des Depots Paléozoiques de |’ Amérique Septentrionale 
