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172 COLLECTIONS FROM MELANESIA.<br />
It will be seen, then, that of the Echinids 19 were found south of<br />
the tropical line, and 11, or 57"5 per cent., were not found either<br />
by the <strong>'Alert'</strong> or 'Australian Museum' collectors within the tropics.<br />
Of the Opliiurids 9 were found south of the line, and only one also<br />
within it, so that of this class 88'8 per cent, were found only to the<br />
south of the tropics.<br />
When we turn to the lists of the ' Alert ' collections in the ' Australian<br />
' seas and in the western part of the Indian Ocean, we find a<br />
very different story.<br />
Ech'mids.—Of the 28 species collected within the tropical seas of<br />
Australia, four only, or 14-2 per cent., were found also at Port<br />
Jackson, while no less than 23, or 72 per cent., were found also in<br />
the tropical parts of the western Indian Ocean.<br />
Table III.—List of Echinoidea collected by the ' Alert ' (to which<br />
is added a statement of such as are found also north of the<br />
equator, but within the tropics).<br />
Cidaris metularia<br />
Phyllacauthus annulifera ..<br />
baculosa<br />
Diadema setosum<br />
Astropyga radiata<br />
Salmacis alexandri<br />
bicolor<br />
sulcata<br />
Temnopleurus toreumaticus<br />
granulosus<br />
botliryoides<br />
Echinus angulosus<br />
darnleyensis<br />
Toxopncustes pileolus<br />
Tripneustes angulosus<br />
Stroiigylocentrotus erythrogrammus<br />
Echinometra lucunter<br />
Fibularia volva<br />
Olypeaster humilis<br />
scutil'ormis<br />
Laganum depressum<br />
decagonale<br />
EchiuoneuB cyclostomus<br />
Maretia planulata<br />
Lovenia elongata<br />
Breynia aust ralasice<br />
Echinocardium australe<br />
Brissus uuicolor<br />
Metalia sternalis<br />
^ (u .-<<br />
=^ § S<br />
O o ^<br />
1-3
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