250 ME. H. L. CLAltK ON SOME 
spines, were taken at Pelsart Island, thus extending the known range of the 
species on the western side of Australia considerably to the south. On the 
mainland coast it is known only as far south as Sharks Bay. 
Heliocidaris eeytheogramma. 
Echinus erythrogrammiis Valenciennes, 1846, Voy. ' Venus,' Zoophytes, pi. vii. fig'. 1. 
Heliocidaris erytlirogramma Agassiz & Desor, 1846, Ann. Sci. Nat. Zool. (3) vi. p. 371 
There are half a dozen specimens of this well-known species of the southern 
Australian coast, but all are young and the specific characters are not well 
marked. Three from the lagoon, Pelsart Group, 25-30 ram. in diameter and 
13-14 mm. high, have purplish tests and bronze-green spines ; the largest 
primaries are 15 mm. long, and not quite a millimetre in diameter at the base. 
There is little doubt that these are normal H. erythrogramna. There is a 
very similar specimen from East Wallaby Island. Two specimens from 
Wooded Island have a different appearance, and yet differ more from each 
other than either one does from the PeLsart specimens. One is about 28 mm. 
in diameter, scarcely 13 mm. high, and has the tubercles much more con- 
spicuous than in the others. The primary spines are purple, but the secon- 
daries show an evident bronze-green coloration. Most of the primaries are 
broken, but it is obvious that all were more or less stunted ; particularly all 
the spines above the ambitus are relatively short and thick and blunt. 
Apparently this specimen lived beneath a rock or among rocks where surf 
or tidal currents were strong. The other Wooded Island specimen has the 
test very light-coloured, with a green tinge abactinally, and the spines are 
green tinged with purple at the tip, at least orally. The largest primaries 
are 10-12 mm. long, with the diameter at base distinctly more than a 
millimetre. This individual looks like a different species from the others, and 
may be a young H. tuberculata, but it is highly improbable that that species 
■occurs in the Abrolhos. Probably this little green specimen was collected 
on an eel-grass bottom in still water, such an environment as favours the 
green colour and the better-developed spines. 
ECHINOMETRA MATHAEI. 
Echimia inathaei de Blainville, 1825, Diet. Sci. Nat. xxxvii. p. 94. 
Echinometra mathaei de Blainville, 1830, Diet. Sci. Nat. Ix. p. 206. 
There is a specimen 47 mm. long, 41 mm. wide, and 2& mm. high from 
North Island, and the label says " Very common everywhere." There are 
also two small specimens (15-17 mm. long) from " Long Island, shore." 
The abactinal tube-feet of the large specimen contain large numbers of the 
triradiate spicules which Doderlein considers typical of his genus Mortensenia, 
but I am not prepared to admit that their jDresence is even a good specifio 
character, and I think these specimens are more properly recorded as 
E. mathaei than as E. ohlonga. But they are evidently identical with those 
wliich Doderlein (1914, Fauna Siidwest-Austral. Bd. iv. Lfg. 12, p. 487) 
identifies as Mortensenia ohlonga, which were collected in Sharks Bay. 
