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NOTES ON SOUTH AUSTRALIAN MARINE MOLLUSCA, 
WITH DESCRIPTIONS OF NEW SPECIES.—PART XV. 
By Jos. C. Verco, M.D. (Lond.), F.R.C.S. (Eng.). 
181 
[From ‘Transactions of the Royal Society of South Australia,” 
vol. xxxvi., 1912.] 
{Read October 10, 1912.] 
Pirates XV. anp XVI. 
This paper is a continuation of the series from page 215 
of vol. xxxy. of 1911, and embraces all the known South Aus- 
tralian species of Helcioniscus, Patella, Nacella, Acmea, 
Phenacolepas, Haliotis, Scissurella, and Schismope. It dis- 
cusses also several species which have been attributed to South 
Australia, but are not recognized as occurring here. 
Iteleioniscus tramosericus, Martyn. LA @ 
Patella tramoserica, Martyn, Univ. Conch., t. 16, P. (Hel- 
cioniscus) tramoserica, Martyn, Verco, Trans. Roy. Soc., S.A., 
906, vol. xxx., p. 205. 
Helcioniscus diemenensis, Philippi, Gatliff and Gabriel, Proc. 
Roy. Soc., Victoria, 1908, vol. xxi. (New Series), part 1, p. 282. 
Gatliff and Gabriel discarded the name P. tramoserica, 
Martyn, because the type locality was North America, and no 
Victorian specimen was exactly like his figure; but in answer 
to enquiries by Mr. Gabriel, Dall has since written that 
Martyn’s species does not occur on the coasts of America, and 
that it is probably Australian or New Zealand. Very likely 
Martyn obtained it from Australia, but by mistake gave it 
an American habitat. 
It occurs all along the South Australian coast from the 
east as far towards the west as Venus Bay. At St. Francis 
Island it is very rare and small, up to 18 mm.; so it seems 
to fade out along our west coast. It was not taken at any 
place along the south or west coast of Western Australia, its 
place being taken by Patella neglecta. 
illibratus, Verco. LZ 6 
Helcioniscus illibratus, Verco, Trans. Roy. Soc., S.A 1906, 
yol. xxx., p. 205, pl. =., figs. 6-14: Type locality—Spencer 
Gulf; Hedley, Commonwealth of Australia, Fisheries, part 1, 1911, 
p. 93, ‘100 fathoms, 40 miles south of Cape Wiles, South Aus- 
Dredged in 15 to 20 fathoms off St. Francis Island, 5 
dead. Taken in Western Australia, as far round as Rottnest 
Island. 
