ECHINODERMS FROM WEST AUSTRALIA. 229< 
Some Echiiioderms from West Australia. By Hubert Lyman Clark, 
Museum o£ Comparative Zoology, Cambridge^ Mass., U.S.A. (Com- 
municated by ProL W. J. Dakin, F.L.S.) 
[Percy Sladen Trust Expedition to the Abrolhos Islands under the 
leadership of Prof. W, J. Dakin.] 
(Plate 13.) 
[Read 1st Fehruary, 1933.]' 
The collection o£ echinoderms placed in my hands by Professor Dakin -"!= 
prove to be of great interest even though the number of species represented 
is small. The specimens were taken off the coast of West Australia, chiefly 
among Houtman's Abrolhos Islands, but a considerable number were dredged 
near Fremantle, while one interesting specimen comes from Broome. Many 
of the species are represented by but one or two specimens, and on this- 
account it is not possible to determine the relative abundance of the 
different forms. 
The 143 specimens represent 46 species, of which two [OpMactis savignyi, 
Ecliinocardium cordatum) are practically cosmopolitan. Of the others, 27 are 
tropical species, most of which are common in the East Indies ; their 
occurrence at the Abrolhos is notable because those islands are so far south 
of the usual range of the species j few, if any, extend their range nearly so 
far southward on the eastern side of the continent. 
There are, in the present collection, 8 species which occur on the southern 
or south-eastern coasts of Australia between Sydney and Perth, though most 
of them are known from only a few widely separated stations. These, which 
may be called the typical Australian species, are : — 
Astropecten preissii Miiller & Troschel. 
Luidia maculata australasiw Doderlein. 
Astemia gimnii Qraj. 
Coscinasterias calamaria (Gray), 
OpJiiothrix spongicola Stimpson. 
Amblypneustes pallidns (Lamarck). 
Heliocidaris erytlirogramma (Valenciennes). 
Bregma australas'uE (Leach) . 
* I beg to express here my sincere tliauks to Professor Dakin for the opportunity of 
studying this valuable collection. I would also thank m.j friend Mr. Austin H. Clark for 
verv important assistance in connection with bibliographical data, which were not available- 
to me. 
