380 THE ZOOLOGIST. 
believed it peculiar to the South Devon coast; it is stated, 
however, to have been captured also in Dublin Bay and Port- 
marnock in Ireland, and in the Hebrides and Orkney Islands 
(Captain Brown), but has evaded all recent researches in those 
districts. It is rightly a member of the Lusitanian fauna, and 
extends its range through the Mediterranean, in many parts of 
which it is as common as it is rare on our coasts.” (5) The 
Turritella communis of the ‘British Mollusca’ is the Turritella 
terebra of the ‘ Malacologia Monensis,’ of which we read, ‘ Fre- 
quently cast ashore (though without the animal) on the north 
coast.” (6) The Natica monilifera is said, in the ‘ Malacologia 
Monensis,’ to be ‘“‘ Rare on the Manx shores; south coast at Port 
Erin ;” to which is added the remark, “I have never seen the 
animal.” (7) Of the Philene aperta of the ‘ British Mollusca,’ 
answering to the Bullea aperta of the ‘ Malacologia Monensis,’ 
the habitat given is ‘‘In the stomach of a haddock caught off 
Douglas, Oct., 1837.” How far on this evidence (and I am not 
aware of any other) these seven species can be justly reckoned 
to belong to the Mollusca of the Isle of Man, I will not decide. 
Perhaps all do. The evidence, however, suggests search for these 
particular species in the living state. 
All the mollusks above-named were known to malacologists as 
natives of our British seas before Forbes wrote; but he believed, 
when he published the ‘ Malacologia Monensis,’ that he had 
discovered a new British species off the western coast of this 
island, namely, Corbula ovata. He writes against the name in 
his work, “n.s.” ; adding, ‘‘ From the root of a Fucus cast ashore 
at Ballaugh”; he also describes and figures the shell. Corbula 
ovata is given in the ‘ British Mollusca’ also, but regarded as a 
doubtful native whether of the coast of Man or other coasts of the 
British Islands. ‘‘ Although,” we read, “the original describer 
(K. F.) of this shell took it himself from the root of a Laminaria 
cast ashore at Ballaugh, in the Isle of Man, he prefers leaving it 
among the doubtful species rather than stamp with the authority 
of mature deliberation the previous introduction into our fauna of 
a species which by its presence there would violate the probabilities 
of geographical distribution. About ten years have now elapsed 
since the date of its publication (1838) during which period no 
second example has been discovered ; should no further specimens 
then be procured upon our coast, the finding of the only recorded 
> + 
