262 THE VOYAGE OF H.M.S. CHALLENGER. 
armature, and by the union of the supero-marginal plates throughout the ray. The 
synonyms of Jconaster longimanus, Mobius, sp., are Astrogonvum longimanum, Mobius, 
Astrogonium souleyeti, Dujardin and Hupé, Goniaster longimanus, Liitken, Pentagonaster 
longimanus, Perrier, and Archaster lucifer,! Valenciennes. 
On the grounds above detailed I consider that the name Dorigona should be ranked as 
obsolete. I am unable to express a definite opinion as to the position of several forms 
recently referred to Dorigona, but I am inclined to think that some of them will perhaps 
fall within the scope of the genus Nymphaster described on a succeeding page. 
I have added to this family four new genera discovered by the Challenger, and I have 
also included the genus Nectria, which has latterly been relegated by Perrier’ to the 
Linckiidee. 
The interesting genus Anthenoides described by Perrier* is referred by him to this 
family. 
In concluding these notes | would remark that Perrier‘ in his latest work has again 
reverted to the family name of Goniasteridee. I think this unfortunate, and in fact inad- 
missible, unless M. Perrier has relinquished the amended classification of the genera 
included in that group, proposed by him in 1884, and noticed above. The scope and 
significance of the family Goniasteridze (Verrill), Perrier, 1875, is quite different from that 
of the family Pentagonasteride, Perrier, 1884. The latter | have adopted in the present 
work, and consider that it ought to be maintained. 
Synopsis of the Genera included in the Family PENTAGONASTERID. 
A, Abactinal area with rounded, polygonal, or paxilliform plates. Granules or 
spinelets when present co-ordinated : 0 : : : . PENTAGONASTERINZ. 
a. Abactinal area covered with rounded or polygonal plates; sometimes 
subtabulate, and either smooth or bearing granules, but not 
forming true paxille. 
a. Supero-marginal plates separated throughout the length of the 
ray by abactinal plates. Abactinal plates not margined by 
elongate valvular plates. 
a, Actinal intermediate plates and infero-marginal plates 
smooth or granulose ; devoid of prominent spinelets. 
i. Marginal plates smooth or granulose. 
1 In citing this erroneous reference to Archaster in the list of species given on p. 122 supra (line 21), I have 
inadvertently written Dorigona longimana, Mobius, sp., instead of Iconaster longimanus, Mobius, sp. The 
reader will please make the necessary correction. The sheet was unfortunately printed off before the error was 
noticed. 
* Nouv. Archives Mus. Hist. Nat., 2e Série, 1878, t. i. p. 79. (On p. 19 of the same work Nectria is 
ranked in the Goniasteride.) 
* Bull. Mus. Comp. Zool., Harvard, 1881, vol. ix., No. 1, p. 23; Nouv. Archives Mus. Hist. Nat., 2e Série, 
1884, t. vi. p. 246. 
4 Ann. Sci. Nat. (Zool.), 1885, t. xix., Art. No. 8, p. 30. 
