168 Mr, W. K. Fisher on Asteroidea. 
Verrill * set aside symbolicus and bipunctus under the name 
Nereidaster, which is synonymous with Rosaster, Perrier 
1894. The type of WVymphaster must be chosen from the 
three remaining species, and for this purpose Nymphaster 
protentus is best adapted. It may therefore serve as the type 
of Nymphaster. The use of the name Dorigona for this 
group is, of course, quite indefensible, since Dorigona is a 
pure synonym of Ogmaster. Nor can the name Nymphaster 
be restricted to symbolicus and allies, as Dr. Kcehler suggested 
in 1910, since the species in question was made the type of 
Nereidaster in 1899. 
~ Iconaster versus Dorigona.—In the paper on Australian 
echinoderms already referred to, Dr. H. L. Clark, on page 36, 
argues that the sea-star known as Lconaster longimanus 
(Mobius) should be called Dorigona longimana for the 
following reasons :—Dorigona, as diagnosed by Gray in 
1866, included two species—D. reevesii and D. longimana 
(= Astrogonium longimanum, Mobius). The first species is 
held, without dissent, to be synonymous with Goniodiscus 
capella, Miiller & Troschel, 1842, which in 1865 had been 
made the type of Ogmaster by von Martens. In 1889 
Sladen made the second species—namely, D. longimana—the 
type of Iconaster. Dr. Clark states that Gray designated no 
type, and that since D. reevesii is invalidated by having been 
made, under another name, the type of Ogmaster, “ Dorigona 
longimana (Mébius) must be the type of Dorigona, and I am 
uite unable to see why Sladen should have deliberately 
replaced Gray’s name with one of his own coining—ZJconaster. 
So far as I can see, Jconaster is a pure synonym of Dorigona, 
which is a monotypic genus with Astrogonium longimanum as - 
its type.” 
Let me quote Gray’s characteristically brief diagnosis { :— 
“V. Dortcona. Body depressed, 5-rayed, smooth ; the 
dorsal and oral disk covered with many smooth, flat, polygonal 
squares ; the marginal ossicules without any mobile spine. 
“1, Dorigona Reevesit (t. 7. f. 3). Inhab. China or 
Japan ; common in boxes of insects brought from China and 
Japan. 
“ See a. Dorigona longimana= Astrogonium longimanum, 
Mobius, Abhandl. iv. (1860) 7, t. 1. f. 5, 6.” 
* Trans. Connecticut Acad. vol. x. 1899, p. 186. ; 
+ «An Account of the Shallow-water-. Asteroidea (Echinoderma of the 
Indian Museum),’ Calcutta, 1910, p. 60. 
{ ‘Synopsis of the Species of Starfish in the British Museum,’ by 
“ 
John Edward Gray, 1866, p. 7. ; 
