8 TH. M0RTKN8EN, ECHINOIDEA. 



es diese Art ist, dei' mit Recht der LAMAECK'sche Name hispinosa zukommt». Unfor- 

 tunately this conviction came so late that Clark still uses the name Phyllacanthns 

 annulifera for this species in his paper on the Western Australian Echinoderms, 

 published in the same year, 1914, as was Doderlein's paper. 



In his » Report on the Sea-Lilies, Starfishes, Brittle-Stars and Sea-Urohins 

 obtained by the F. I. S. »Endeavour» on the coasts of Queensland, New South 

 Wales, Victoria, South Australia and Western Australia*^ H. L. Clark appears to 

 have finally accepted the interpretation of these species maintained by Doderlein 

 and myself, and also the limitation of the genus Phyllacanihus maintained by us. 

 In the same time he points out, that the Stephanocidaris hisfinosa of Agassiz is 

 identical with the Phyllacanthus australis of Ramsay, the species having thus to be 

 named Prionoddaris australis (Ramsay), the name Pr. Agassizi Doderlein becoming 

 a synonym of it. 



In my »Echinoiden d. deutschen Siidpolar-Exped. « I established the genus 

 Plococidaris for the two species hispinosa (Lamck.) and verticillata (Lamck.). Doder- 

 lein (Ech. d. Aru-Inseln, p. 242) objects that the character of the presence or 

 absence of spots on the collar of the radioles, which is the only essential mark of 

 distinction between Prionoddaris and Plocoddaris, is too insufficient for generic distinc- 

 tion. I agree that it is an unessential character, but then it is a fact that among 

 the Cidarids apparently trivial differences in the radioles do afford very important 

 characters for the distinction of the genera (e. g. Caloddaris). In any case the 

 species hispinosa and vertidllala form a separate group within the genus Prionoddaris, 

 and it is then rather a matter of convenience, whether M^e will regard such group 

 as a separate genus or not. If the var. elegans should prove to form a separate 

 species, that would be additional reason for keeping this group of species as a sepa- 

 rate genus or, at least, subgenus. For the present, however, I think it unnecessary 

 to maintain the genus Plocoddaris, and agree with Doderlein in referring also the 

 species hispinosa and vertidllaia to the genus Prionoddaris. 



Herewith we have evidently at length come to an agreement and — it may 

 be expected — a final settlement of these vexating nomenclatural questions. The 

 species of the two genera Phyllacanthus and Prionoddaris are then the folloAving. 



PhyllacantMis Brandt. 



Genotype: imperialis (Lamck.) (Syn. d.uhia Brandt). 

 Other species: tenuispinus Woods; Thomasii A. Ag. & H. L. Clark; 

 magnificus H, L. Clark; longispinus Mrtsn. 

 Prionoddaris A. Agassiz. 



Genotype: baculosa (Lamck.), with var. annulifera (Lamck.). 

 Other species: hispinosa (Lamck.) (non A. Ag.); australis (Ramsay) (syn. 

 hispinosa A. Ag., Agassizi Dorerlein); haioaiiensis (A. Ag. & H. L. 

 Clark); glandulosa (de Meijere) ; verticillata (Lamck.). 



' Biological Results of tlic Fishing Experiments earned on liy tiio F. I. S. > Endeavour* 1909—14. Vol. 

 TV. Part T. 191fi. p. 9fi--9S. 



