170 Mr. C. Hedley on Australian Slugs. 
The conclusion has forced itself upon me that, all the species 
of Zimax described as native to Australasia may be referred 
toeither L. maximus, flavus, gagates, agrestis, or levis, all 
introduced from Europe. Mr. Cockerell prefaces his remarks 
by assuring his readers that the powers of migration of a slug 
are extremely limited. Be that as it may, in their race to the 
antipodes they have far outstripped their shell-bearing rela- 
tives. Tasmanian specimens of L. maximus were observed to 
be infested with an acarus, which, unfortunately, I failed to 
preserve. Should it prove to be identical with the parasitic 
attendant of the European mollusk, this fact would argue 
that the animals migrated not in the egg but in the adult 
stage. 
After examining several hundreds of the handsome diamond- 
slug, Aneztea Gr aeffet, Humbert, from various localities 
ranging along fourteen degrees of latitude, I reiterate the 
opinion formerly expressed (Proc. Roy. Soc. Queensland, 
vol. v. pt. v. pp. 162-173) that only one species of this genus 
is yet known to inhabit Australia, and that, with all deference 
to Mr. Cockerell’s decision, A. Kreffti and Schutei ave mere 
synonyms. The colour, size, and shape, as well as all details 
of the external anatomy, are so obscured in spirit-specimens 
of slugs that specific characters should be described from such 
with extreme caution. As instancing the difference between 
living and preserv ed specimens I w vould invite comparison 
between two figures of A. Graeffet, (a) ‘ Mémoires de la 
Société de Physique et d’Histoire Naturelle de Gendve,’ 
vol. xvii. pt. 1, pl. xi. fig. 2, from an alcoholic specimen, and 
(6) ‘ Proceedings s the Roy ral Society of Queensland,’ vol. v. 
pt. 5, pl. vii. fic. 1 (published with vol. vi. pt. 1), from life ; 
as well as between those of Cystopelta Petter di, Tate, (a) 
‘Proceedings of the Linnean Society of New South Wales,’ 
(2) vol. v. pt. 1, pl. i. fig. 1, from an alcoholic specimen, 
and (b) op. cit. vol. vi. pt. a pl. il. fig. 4, from life. 
When Mr. Cockerell writes of A. Macdonaldi, Gray, “ New 
Caledonia, and reputed also to occur in the New Hebrides,” 
he has evidently transposed the localities, as a glance at Dr. 
Macdonald’s original description in an early number of this 
periodical will show. ee it is from the island of Anei- 
teum, in the New Hebr ides, tl iat the genus derives its name. 
It was also collected in that island by the well-known traveller 
and zoologist Mr. John Brazier, and is unknown in New 
Caledonia. 
To Australia Mr. Cockerell assigns eighteen species of 
Helicarion. J can only say that Australian naturalists are 
unacquainted with eighteen, or even with eight, indigenous 
