228 MR. 0.A.L. MORCH ON GENERA OF MoLLUscA. [Nov. 11, 
Vertagus, Link (not Klein), is Terebra, Brug. 
Aluco, Link,-is Tympanotonos and Cerithium. 
A. fuseus, Link, Chemn. iv. f. 1475. 
A. auritus, L. 
A. aculeatus, L. 
A. nodula, L. 
Tivela, Link, p. 152; T. vulgaris, Link (Venus corbicula, Born. 
Gm.), and 7’. ¢ripla, lL. This name, therefore, has priority over 
Trigona, Megerle. 
Musculium, Link, p. 152. “ Sumpferschale. Die Schalen gleich, 
rund, schliessen tiberall. Das Schloss mit zwei kleinen Zaihnen, 
ohne Seitenziihne; Vorder- und Hinterspalte ziemlich gleich ; das 
Band auswendig.”’ 
M. lacustre (Tellina), Gm. p. 3242; Ch. vi. f. 13. f. 135. 
Herrmannsen erroneously refers this genus to Pesidium, Pfr. From 
the figure of Chemnitz quoted, there cannot be any doubt that 
Cyclas calyculata is the type. The expression, “nearly equila- 
teral,” excludes the genus Pisidium. ‘No lateral teeth’’ does not 
agree with any European freshwater shell, and is very likely a 
misprint. 
Musculium must be retained as a subgenus of Spherium, Scopoli. 
Nuculana, Link, p. 155. ‘ Meernuss. Die Schalen gleich, schlies- 
sen itberall. Eine Reihe von kleinen spitzigen Zahnen an der 
Vorderseite der Schalen neben den Spitzen. Nucula, Lam.” 
Nuculana rostrata, Gm. p. 3308; Ch. vii. f. 550, 551. The 
author only seems to have noticed the teeth on one side of the 
umbones. Notwithstanding this, the genus must be regarded as 
established, and take priority over Leda, Schum. 
Unionium, Link, p. 155, is Avicula, as Deshayes has restored it. 
Anodonta, Link, p. 156, is Loripes, Poli, founded on Venus edentula, 
Gm. p. 3286; Ch. vii. f. 410, 411=. alba, Link. 
Pectinium, Link, p. 156, corresponds to Pecten of authors. 
Limaria, Link, p. 157, is Radula, Klein. 
L. vulgaris, Link= Ostrea lima, Chemn, vii. f. 651. 
Sellana, Link, p. 158, is the bent form of Placuna, and is synony- 
mous with Ephippium, Bolt. 
Atractilites, Link, p. 9. “Eine spindelformige inwendigstrahlig 
krystallinische Schale, ohne Alveole.”’ 
A. belemniticus appears to be Belemnites listeri. 
Siphonium, Link. ‘Eine gerade Schale mit Scheidewanden welche 
ausserhalb Ringe bilden. Hierher gehoren die geraden Nautili.” 
S. fascia, Very similar to Nautilus fascia, but larger. 
