6 " ENDEAVOUR SCIENTIFIC RESULTS. 



HOLOTHURI ANS . 



Leptosynapta dolabrifera. 

 Pentacta spinosa. 



The western limit of this subregion is not easy to determine. 

 The little work the " Endeavour " did in the Great Australian. 

 Bight revealed a very interesting fauna and suggests that 

 many of the Echinoderms of the South Australian subregion 

 do not extend their range west of 125°E. Long. At any rate, 

 there is no doubt that once Cape Naturaliste is passed, the 

 Echinoderm fauna undergoes an appreciable change, although 

 a few species from the south (as Ptilometra macronema) range 

 northward to Geraldton, Western Australia. 



3. West Australian subregion, extending northward 

 from Lat. 35°8. ; the northern limit camiot be given 

 as we know almost nothing of the echinoderm fauna 

 between Lat. 20° on the north-west coast to Port 

 Darwin, a distance of more than a thousand miles. 

 Some eighty -five species of Echinoderms are now known 

 from West Australia ; of these ten or a dozen are 

 species of the South Australian subregion and rather 

 more than thirty are species from the north, relatively 

 few of which are, however, truly East Indian. More 

 than forty species, or half the fauna, are peculiar to the 

 subregion, so far as we know, and many of these are 

 very remarkable forms, often representing peculiar 

 genera. The following are some of the characteristic 

 species : — 



Crinoids. 



Comatula etheridgei. 

 Petasometra helianthoides. 

 Neometra gorgonia. 



Asteroids. 



Nectria ocelli f era. 

 Oreaster nodulosus. 

 Culcitaster anamesus. 

 Linckia tyloplax. 



Ophiurans. 



Conocladus microconus. 

 Astrogymnotes catasticta. 

 Ophiocreas adhcerens. 

 Ophiothrix smaragdina. 



