FSS ae eee hy Poa ee ea ea, br aera 
ate ce 
Geology. 131 
Aruyris and Spirteera have been proved to be entirely synonymous. 
The same species are cited as typical, both by McCoy and D’Orbigny, 
under these two generic names. McCoy proposed the genus Aruyris in 
1844. and D’Orbigny the name Spirtcera in 1848. In British Palwo- 
zoic Fossils, page 192, 1852-55, we find “ Genus Athyris (McCoy) 1844: 
Syn. Sprrigera (D’Orbigny) 1848;” here the author himself cites Spr- 
RIGERA as a synonym. 
_Atayris has precedence of date over Sprarezra; but, from the contra- 
diction of fact implied by the name, it has been oljected to;* so much 
so that Davidson, in his English edition of the Introduction to the Study 
of the Brachiopoda, adopts the name Spirieera for the typical species of 
McCoy’s genus, and places under Atuyrris such forms as A. tumida for 
those before placed under SprrtcERrA. 
The species enumerated by McCoy under his genus, in 1844, were 
- concentrica, A. decussata, A. expansa, A. fimbriata, A, glabristica, 
A, globularis, A. hispida, A. planosuleata, A. squamosa, an . tri 
All these are true Atnyris, as the genus is now understood and ac- 
cepted. The fact that Prof, McCoy, nine years later, cited Atrypa 
it was Just as much free for the foundation of a genus after the citation of 
before. 
McCoy as 
: © genus Merisra was proposed by Edward Siiss, and is founded 
"pon important and peculiar characters not p by A. ¢ 
When the reviewer says that S. concentrica must be the type of Spr- 
NGERA, is he aware that this identical species, A. concentrica, is the type 
of MeCoy’s genus Arnyrts ? : fs 
Furthermore, the reviewer goes on to cite Davidson, and says: These 
: ee Palzontologists. oo 
ity of this being agreed to by Palo aie “ia tees 
h just quoted he cites Davidson 
THYRIs, stating it to be “in 
nd > a proposed as a substitute 
n 
lished. In the paragrap 
Spiricera, on 
McCoy as the type Arnyris, See Davinsoy, 
Proposed b: . ition, page 85; 
lon to the Study of the Brachio English edition, oer rr 
a ion, 1856; also McCoy's Synopsis of the Carboniferous Foss 
—~t. B, 
