34 
licated variety as a distinct species ; and in this opinion he 
was supported by Donovan and Montagu; the latter au- 
thor, however, in the supplement to his Testacea Britan- 
nica, admits MW. wmbilicatus, curtus, barbatus, and modiolus 
of Pennant, to be one and the same species. os 
Se. 3. MODIOLA GIBBSII. 
Tas. LXXII. Fie. II. 
M. testa fusca sub epidermide albida; interne albida pos- 
tice rufescente ; latere antico late sinuato; latere postico 
ala rotundata. 
Habitat ———. 
GIBB’s MODIOLA. 
Shell externally fuscous, beneath the epidermis whitish ; 
internally whitish, with the posterior side reddish ; ante- 
rior margin with a broad sinuation ; hinder margin with 
a rounded wing. 
This species was first noticed as a distinct species by Mr. 
Gibbs (formerly collector for Montagu), who found several 
specimens on one of the western coasts of England. I have 
likewise seen a single specimen which was taken at Daw- 
lish ; but until farther proof shall have been produced of 
its being a constant inhabitant of our coasts, I shall refrain 
from adding it to the British Fauna, which is already 
swelled by the addition of many very doubtful inhabitants 
of our coasts. 
The serrated epidermis or beard, as well as the reddish 
mark within the shell, distinguishes it from Mopioza Pa- 
PUANA; the whole form of the shell also is different. 
