SEA LILIES, STARFISHES, ETC.—CLARK. 97 
classification of Echini (as he states in a footnote) and so 
suggests two sections for the subgenus and mentions certain 
of Lamarck’s species of Cidarites in connection with them, 
does not so far as I can see affect the status of Phyllacanthus 
at all. It seems to me clear that the only generic name, 
except Cidaris (=Cidarites), which may be used correctly 
for dubia and imperialis, whether they are identical, as is 
generally believed, or not, is Phyllacanthus. 
PHYLLACANTHUS IMPERIALIS (Lamarck). 
Cidarites imperialis, Lamarck, Anim. sans Vert., ii., 1816, 
p. 54. 
Phyllacanthus imperialis, Brandt, Prodrome, 1835, p. 268. 
The test of this individual is about 45 mm. in diameter and 
the longest spines are 60 mm. long and 5 mm. thick. It is un- 
doubtedly an example of Tenison-Woods’ P. parvispina, but I 
am not prepared to recognise the form by name yet. A good 
series of specimens from the Murray Islands in Torres Strait 
are all typical P. imperialis, so far as I can see, but all the 
New South Wales material I have examined has the slender 
spines of P. parvispina. The amount of available material 
from other regions is not sufficient to enable me to decide as 
yet on the worth of this character. 
Loc.—Shoalhaven Bight, New South Wales, 15-45 fathoms. 
Genus PrionocrD4RIs, A. Agassiz. 
PRIONOCIDARIS AUSTRALIS (Ramsay). 
Phyllacanthus australis, Ramsay, Cat. Echinod. Austr. Mus., 
1885, p. 44. 
Stephanocidaris bispinosa, A. Agassiz, Rev. Ech., pt. 1, 
1872, p. 160 (nomen nudum) ; pt. 3, Sept., 1873, p. 393 
(NoN Cidarites bispinosa, Lamarck, as described and 
figured by de Loriol, Mém. Soc. Sci. Nat. Neuchatel, 
v., May, 1873, p. 33). 
Prionocidaris agassizii Déderlein, Abh. Senck. Naturf. 
Ges., xxxiv., 1911, p. 242. 
This is a remarkable series of a very notable species. 
Déderlein (loc. cit.) has shown very clearly that the genus 
Stephanocidaris A. Ag. is a pure synonym of Goniocidaris and 
hence cannot be used for this species. He shows further that 
