181 
On Naticoid Genera Lamellaria and Caledoniella 
FROM South Australia. 
By Herbert Basedow. 
[Read April 4, 1905.] 
Plates XXVI. to XXIX. 
The Naticid.e include a sub-family known as the Lamd- 
larmice, the members of which are characterised by possessing 
a thick dorsal shield (reminding of the mantle of the Dorida }, 
partly or wholly enclosing a fragile shell. Five genera have 
now been established, and of these two have their shell com- 
pletely enveloped by the animal. They are Lamellaria and 
Caledoniella. 
The genus Caledoniella was founded in 1869 by Souverbie 
on the shell of an unknown animal It was consequently very 
doubtfully placed among the Xaticidce, and has maintained 
its uncertain position ever since. 
Among other genera that came under my notice on Dr. 
J. C Verco's marine dredging excursion were included a 
number of molluscs with internal shells, and of these I have 
separated several forms which I unhesitatingly refer to this 
little-known genus. 
After an examination of the dentition and general struc- 
ture of the animal I am fully convinced that Caledoniella is 
correctly included under the Xaticidre, in the sub-familv 
Lam ellariince . 
An unfigured species of Lamellaria, the internal shell of 
which was originally described in 1849 from New Zealand, by 
Gray,* has been reported to occur in South Australia. It 
goes by the name of Z. ophione. Dr. Verco ha5 dredged a 
shell, measuring 8 mm., in Backstairs Passage, in 22 fathoms, 
which, as near as determination will permit, is L. ophione. 
An additional new species is described in this paper. 
Genus Lamellaria, Montagu, 1815. 
Lamellaria australis, spec nnv 
Aniwal. — Dorsal shield elliptic, with a waved outline 
and notched in front; soft, smooth, or minutely granular: 
appreciably broader than the foot, over the sides of which it 
folds very loosely and imperfectly (differing in this respect 
considerably from Caledoniella ) : under side obliquely striated 
(muscle fibres), around the foot. Body depressed, more con- 
* Proc. Zool. Soc, Lond., 849. p. 169. 
