286 
8. Diplodontias dilatatus (E. Perrier). 
PI. XII. Fig. 11. 
Astrogonium miliare Cray. Hutton. 1872. Catalogue Echinod. N. Zea¬ 
land ; p. 7. 
Pentagonaster dilatatus. E. Perrier. 1875. Revision de la Collection de 
Stellérides du Mus. d’hist. nat. Paris. Arch. Zool. 
expér. & génér. V. p. 217. 
Sladen. 1889. “Challenger” Asteroidea; p. 286. 
E. Perrier. 1894. Exped. Travailleur & Talis¬ 
man. Échinodermes. p 244. 
H. Farquhar. 1898. On the Echinoderm Fauna 
of New Zealand. Proc. L. Soc. N. S.Wales. p. 311. 
P. de Loriol. 1901. Notes pour servir å l’Ét. 
des Échinodermes. IX. p. 43. PI. III. fig. 6. 
H. Farquhar. 1907. Notes on N. Z. Echino- 
derms. Trans. N. Z. Inst. XXXIX. p. 126. 
W. K. F i s h e r. 1908. Necessary changes in the 
nomenclature of Starfishes. Smiths. Miscell. 
Coll. 52. p. 89. 
R. Koehler. 1911. Description de quelques 
Astéries nouvelles. Rev. Suisse de Zool. XIX. 
P. 9. PI. 1.4-7. 
Gnathaster 
Goniodon 
Gnathaster 
Goniodon 
Diplodontias 
Goniodon angustiis. 
Tayior’s .Mistake, Lyttelton. Rocks, at low water. 2 specimens, 
collected by Mr. W. R. B. Oliver. 
No specimens were collected by the author. 
As pointed out by W. K. Fisher, the name Goniodon proposed 
by Perrier for the genus established by him with this species as 
the genotype, is preoccupied (for a Mollusc), and it thus becomes 
necessary to adopt the navoQ Diplodontias proposed by Fisher. 
The species angustus established by Koehler is, in my opinion, 
only a synonym of dilatatus. According to Koehler angustus differs 
from dilatatus mainly in the shape of the arms, which are gradually 
diminishing in width towards the point, not widened in the point 
as is the case in dilatatus; further the madreporite is much larger 
and the adambulacral spines occupy a broader space in angustus. 
Of the two specimens in hånd one has the shape of arms typical 
of dilatatus., the other that of angustus', in both specimens the 
madreporite is very large, as in angustus. In the specimen with 
shape of arms as in dilatatus the adambulacral spines are much 
less prominent and occupy a distinctly narrower space than in that 
