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ECHINODEEMATA. 121<br />
of 20*5 millim. and is 12 millim. high ; the abactinal area is 4-5 and<br />
the anal area is 2 millim. in diameter. The short primary spines,<br />
which, as in the other specimens, have two or three short bands of<br />
bright red on their white surface, have the neighbouring suckers of<br />
a purplish-slate colour, and these give a deeper and richer appearance<br />
than ordinary to the test. The abactinal area is not so conspicuous<br />
as in the smaller specimens, and only one of the genital<br />
plates has more than three tubercles.<br />
Thursday Island ; Prince of Wales Channel.<br />
A. Agassiz, Rev. Ech. p. 489.<br />
9. Echinus angulosus.<br />
With a little hesitation I refer to this species three specimens from<br />
Thursday Island, and one from Prince of Wales Channel. The<br />
species is a wide-ranging one, and apparently presents a good deal<br />
of variation.<br />
10. Echinus darnleyensis.<br />
J. E. Tenison-WvodsjProc. Linn. Soc. N'. S. W. ii. p. 165.<br />
In accepting this species, I should like to do so only provisionally,<br />
as a systematic revision of the exceedingly troublesome genus to<br />
which it belongs may show it to be only part of one of the very<br />
variable species which are associated under the emended genus<br />
Echinus.<br />
Thursday Island (4 fms.) and Prince of Wales Channel.<br />
11. Tripneustes angulosus.<br />
Hippouoe variegata, A. Ayassiz, Rev. Ech. p. 501.<br />
Tripneustes angulosus, BeU, P. Z. S. 1879, p. 657.<br />
The coloration of this specimen is more marked than any I have<br />
yet had the opportunity of examining ; the short white sjjines are<br />
found either on white areas, the middle of which is occupied by a<br />
black patch, or on broad black bands, rather more than half as wide<br />
as the white areas at the ambitus.<br />
The single small specimen collected was found at Levuka, Fiji.<br />
12. Strongylccentrotus erythrogrammus, Vol.<br />
Strongylocentrotus eui-ythrogrammus, A. Agassiz, Rev. Ech. p. 441.<br />
It may perhaps be pointed out that the spelling of the specific<br />
name as here adopted is not only that which is etymologically<br />
correct, but is the very same as that which was proposed by Valenciennes<br />
(' Voy. Venus,' Zoophyt. pi. vii. fig, 1), and adopted by<br />
Liitken and Verrill : it is true that in the ' Catal. Eaisonne ' of L.<br />
Agassiz and Desor (1846) we find the spelling euryihroyrammus.
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