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, v\^hether they are identical, as is 

 generally beheved, or not, is Phyllacanthus. 



Phyllacanthus imperialis {Lamarck). 



Cidarites imperialis, Lamarck, Anim. sans Vert., iii., 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 Prionocidabis, A. Agassiz. 



Pbionocidaris 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, Mem. Soc. Sci. Nat. Neuchatel, 

 v., May, 1873, p. 33). 



Prionocidaris agassizii Doderlein, Abh. Senck. Naturf. 

 Gcs., xxxiv., 1911, p. 242. 



This is a remarkable series of a very notable species. 

 Doderlein {loc. cit.) has shown very clearly that the genus 

 Stephanocidari<i A. Ag. is a pure synonym of Goniocidaris a,nd 

 hence carmot be used for thiis species. He shows further that 



