SEA LILIES, STARFISHES, ETC.—CLARK. 43 
Colour (dry or in alcohol), brown, darkest on the bare 
membrane of the disk, lightest near the tips of the rays. 
This is a very remarkable Starfish, one of the most inter- 
esting of the “ Endeavour’s”’ captures. It stands midway 
between Nectria and Mediaster having the heavy, widely 
separated abactinal plates of the former, but with these 
plates not at all paxilliform. It is very different from typical 
Mediaster in its general appearance abactinally, but actinally 
is very similar to M. australiensis, save that the spines and 
granules are much coarser. Supplementary internal abactinal 
plates and rudimentary superambulacrals are present. The 
ampullz are double. It might be made the type of a new 
genus between Mediaster and Nectria but there are already so 
many monotypic genera, one may well be avoided here, since 
the diagnosis of Mediaster, as at present used, does not require 
any essential modification to admit MZ. monacanthus. This 
specific name is not altogether a happy choice, since many 
specimens fail to show the single spinelet on the abactinal 
plates, so conspicuous in the holotype ; but as the name has 
been in vogue as a manuscript name for several years, and 
specimens so labelled have been sent out from Sydney, it 
seems best to retain it. It is a little remarkable that this 
conspicuous Starfish was taken at only one station. Ten 
specimens. 
Loc.—Six miles east of Cape Hawke, New South Wales, 
47-50 fathoms. 
Genus Tost, Gray. 
ToOSsIA AURATA, Gray. 
Tosia aurata, Gray, Proc. Zool. Soc., 1847, p. 80. 
This is a fine series of this handsome pentagonasterid ; the 
longest has R=73; in the smallest R=40; in the least 
pentagonal r=.60R, and in the most pentagonal, r=.68R. 
One of the specimens from Oyster Bay, Tasmania, with R=63 
mm. is perfectly tetramerous. Eighteen specimens. 
Locs.—Oyster Bay, Tasmania, 20-40 fathoms. 
Isle de Phoque, Oyster Bay, Tasmania, 27 fathoms. 
Mainwaring Cove, west coast of Tasmania, 50 fathoms. 
South-east coast of South Australia. 
South coast of South Australia. 
