FROM THE MONTE BELLO ISLANDS. 669 
T can see no flaw in Blainville’s description, and the locality 
“New Holland” suggests that it might have been brought home 
from Torres Straits where it was very common, or it might even 
have been collected by Peron and Lesueur at Shark’s Bay, West 
Australia, whence Thiele (Die Fauna Siidwest Australiens, 
vol. i. p. 398, 1911) has recently recorded it under the name 
Acanthopleura spuriger Sowerby. 
Sowerby’s Chiton spiniger was of unknown locality, and the 
figure 1s somewhat abnormal as to the length of the spines on 
the girdle. 
Pilsbry included A. spiniger Sowerby in the typical subgenus 
(A. spinosa (Bruguiere) being the type of the genus) and proposed 
a new subgenus Amphitomura (Nautilus, Jan. 1893, p. 105) for 
Ch. borbonicus Deshayes, admitting Ch. brevispinosus Sowerby 
as distinct from that species but referable to the same subgenus. 
These two are practically from the same locality, and typical 
specimens prove their identity. 
From the Red Sea comes a form which has just as commonly 
been referred to A. “ spiniger” as to any other species, Pilsbry 
making note of this. I have examined ma ny Specimens, and this is 
undoubtedly referable to the species brevispinosa, but as certainly 
subspecifically separable. This form, which should bear Roche- 
brune’s name balanse, completely breaks down any subgeneric 
distinction between brevispinosa and gemmata; but the latter is 
just as clearly subgenerically recognisable when contrasted with 
spinosa. 
Pilsbry included Ch. echinatus Barnes under Acanthopleura, 
though forming a subgenus (Jesotomura, Nautilus, Jan. 1893, 
p. 103) for it. I would reject this species from the genus, so that 
my genus Acanthopleura would read :— 
ACANTHOPLEURA. 
Subgenus Acanthopleura. 
spinosa Bruguiere. 
Subgenus dAmphitomura. 
brevispinosa Sowerby 
(=borbonica Desh.) 
with several subspecies. 
gemmata Blainville 
=spuriger Sowerby) 
with several ‘subspecies. 
Subgenus Maugeria. 
granulata Gmelin. 
I must note that dissection of the type of Chiton cunninghami 
Reeve, described from ‘ Australia,” proves that shell to be 
identical with brevispinosa and the locality incorrect. 
TURBO SQUAMOSUS Gray, 1847. 
Hedley included in his List a Turbo foliaceus Philippi, 1846. 
In the Zeitschr. fiir Malak. (Menke) 1846, p. 98, Philippi 
46* 
