161 
A. (Loboplax) variabilis, Adams and Angas: Bednall, Proc. 
Mal. Soc., London, vol. ii., part 4, April, 1897, p. 156; Hedley 
Se ht Records Australian Museum, vol.—xii., No. 4, 1909, 
p. ' 
This is the most widely distributed of all South Australian 
Acanthochitons. I have found it all around the coast from 
Port MacDonnell to St. Francis Island. It is found on the 
South-East coast, St. Vincent and Spencer gulfs, and on the 
West Coast as well as on Kangaroo Island. I have specimens 
from twenty-three different places. The pinnatifid appear- 
ance of the dorsal area and the very tiny spicules at the 
sutures, sometimes only horny protuberances, easily differ- 
entiate this species from other Acanthos. It assumes every 
variety of shade and colour from a creamy-white to almost 
black, greens generally predominating. Lighter - coloured 
varieties are plentiful on Kangaroo Island and the west coast 
of Yorke Peninsula. 
In young specimens the girdle of the Acanthos is very 
small, but when full-grown it has a large fleshy girdle, often 
twice as wide as the tegmentum. If not kept in spirits this 
girdle shrinks up considerably. 
OCOChLBeL 
47, i crocodilus, Torr and Ashby, 1898. 
Acanthochites crocodilus, Torr and Ashby, Trans. Roy. Soc., 
§.A., 1898, p. 216, pl. vi., fig. 2. 
Two specimens were found at a very low tide at Marino, 
one valve was taken by Mr. Klem at Corney Point, and M 

Vep“s 
Hedley, Records Aus. Mus., vol. vii., No. 2, 1908, Hedley 09 7-F 
and May, reports having taken it off the coast of Tasmania. 
May and Torr, Proc. Roy, Soc., Tasmania, 1912, pp. 35, 36, 
say this is not crocodilus. 
The remarkably foliated appearance of the dorsal area 
and the shagreened pustules on the latero-pleural area make 
it easy to distinguish this rare species. 
hs, aig, 12 Ao, Qe 
48. i cornuta@s, Torr and Ashby, 1898. 
Acanthochites cornutus, Torr and Ashby, Trans. Roy. Soc., 
§.A., 1898, p. 217, pl. vi., fig. 3 
This is evidently a deep-water species. It was dredged 
took one at Wool Bay. Specimens have been taken at 
| 
| 
by Dr. Verco in 14 fathoms off Ardrossan. Mr. A. R. Riddle Fs72- 4 
Marino, Normanville, and St. Francis Island. 
Its pinnatifid dorsal area, decided carination, and regular 
rows of pustules are its distinguishing features. Mr. Hedley 
found eyes on the dorsal area of A. cornutus. He used f-in. 
lens. 
