ia See a ee a aks ak SO lle. di gta ie eS ogg ah. ff aaa h 
we ‘ Has hg = fot i’ a is Stig 
‘ A ; ne “ ae Fe to ae a 
E. Billings on the Genus Athyris. 55 
On page 160 of the same work, there are some farther re- 
marks on the classification of the brachiopoda, by Prof. Suess, 
in which he refers to the genus Merista. No generic description 
is, however, there given. It appears also that it was again 
noticed in “Leonhard’s Neues Jahrbuch, p. 127, 1854.” I 
have not, at present, access to that work, and do not know 
whether the genus is described there or not: at all events, at 
the time Mr. Davidson prepared the English edition of his 
“ General Introduction,” Meristu was not understood. 
rof. King in his ‘“‘ Monograph of the Permian fossils of Eng- 
land” (1850) proposed to restore the genus Cleiothyris of Phil- 
lips, apparently making it partly equal to Athyris McCoy. But 
the specimen on which this arrangement was founded, was after- 
ward shown to Mr. Davidson, and by him identified with T. 
scalprum Barrande (now Merista scalprum), while Cleiothyris 
was intended by its author as a substitute for Airypa. (See Da- 
vidson’s Introduction, p. 85.) 
ubdivision of the Genus by Mr. Davidson in 1854.—From 
Mr. Davidson in his “ General Introduction” in oe 
to reconcile the conflicting nomenclatures of D’Orbigny anc 
McCoy divided the genus, retaining the name Athyris for “ forms 
with an apparently imperforate or ¢ foramen, vari- 
ously disposed septa and largely developed dental plates. He 
Terebrateln geziihlte Formen an ihrer Spitze keine Oeffnang fir den Anheftungs- 
muskel besitzen, und dass auch die Vertheilung sig inneren Organe auf eine Ver- 
por inneren Organe eis yon ene Wanden, — einer einfachen Kalkschleife 
; die Spiral bst sind nicht aufrollbar.”_ — 
Sea i Bears ol eee a ie Aol: Sil 
a are Sa eh ce Sian nen a gato A 
in den Gesetzen paliontologischer Verbreitu ne. seen 
schroffstan entgegengestanden waren.”—Jahrouch der k. k, geologischen Reichsan- 
stalt, Vienna, ii, pt. 4, pp. 150, 160. 1851. tee ee 
at ees ae 
