l8 ECHINOIDEA. I. 



or not, is not mentioned; I have not been able to find any large globiferous pedicellariæ in the few 

 specimens I have examined), and the same, I snppose, holds also good with regard to Pliyllacanthus 

 dubia and farvispiiia Woods. Finall)' a similar form of globiferous pedicellariæ is fonnd in Gonio- 

 cidaris Jiorigera Kg. (; Challenger>-Echinoids, PI. I. Fig. 12) (PI. X, Pigs. 27, 29); in the latter there is no 

 trace of a limb on the stalk. 



Do now all these species belong to one genns? — Snrely not. We shall first have to separate 

 Goniocidaris florigcra. It has no trace of a limb on the stalk, the spines differ considerably from 

 those of all the other mentioned species, and I snppose that a closer examination will show several 

 other peculiarities. Doderlein (116) thinks it to be most nearly related to the species Goniocidaris 

 clypeata and G. mikado described by hira, which species are distinguished by the spines being provided 

 with a pecnliar flat widening at the base. Traces of siich a widening are also foiind in G.florigera\ 

 bnt the pedicellariæ of this species are so different from those of the two mentioned species that their 

 beiug united into one genns is ont of the qnestion. It differs also from the gennine Goiiiocidaris-s^Qci&h 

 [G.tubaria etc.) by its pedicellariæ; it mnst form a separate genns, for which I propose the name of 

 Petalocidaris. There can scarcely be any donbt, however, that it is closely related to Goniocidaris. 



Next Pliyllacanthus imperialis must form a separate genns. It has pecixliar large tridentate 

 pedicellariæ, the blades of which are qiiite filled by a close net of meshes forming irregnlar longi- 

 tudinal ridges closely set with small teeth (PI, X Fig. 8); (the valve figured here, is from a smaller pedi- 

 cellaria where onl\' two longitudinal ridges are seen). The small pedicellariæ have no end-tooth 

 (PI. IX. Fig. 6). The spines are pecnliar, thick, with fine longitudinal striæ. Together with this species 

 Pli. dubia has no doubt to be placed — if upon the whole it can be kept as a separate species, of 

 which I can have no decided opinion, as I have had no occasion to examine it. A\so P/iyllac. par^'ispina 

 Woods must, to judge by the figure given by Woods (443), belong here; its spines resemble very mnch 

 those oi Ph. imperialis though Woods states them to be < entirely different from any described species . 

 Also Ramsay (331 p. 45) says of this species that on the Australian sonth-coast it is the «representative 

 of P.dnbia of the North Coast?. — This genus, no doubt, must keep Brandt's old name of Pliylla- 

 canthus. Brandt') gives Cidaritcs dubia as the type of the section . Phyllacanthus >, and observes that 

 to this will have to be added C. imperialis., hyslrix^ geranioides, and pistillaris. The three latter can in 

 no way be classed together with the two former; these two must keep the name of Phyllacanthus. 

 Desor in his «Synopsis des Echinides fossiles» (1855) establishes the genus Leiocidaris (p. 48), and as 

 the type of the genus he gives Cidaris imperialis. — Thus there will be no nse for the name of Leio- 

 cidaris., it will only be a synon\m of Phyllacanthus. — It will also be necessary to say some words of 

 the mnch used name of Rhabdocidaris by the present occasion. The genus has been established b}' 

 Desor (op. cit. p. 39) for fossil species; in a note is added: «Parmi les espéces vivantes on pourrait 

 reporter å ce genre les Cidaris tribuloides et C. imperialis^ si leurs tubercules n'étaient pas complétement 

 lisses». De Loriol (245) has later enlarged this genus to comprise: i) The fossil species of the genus 

 Rhabdocidaris sensu stricto, 2) the Rhabdocidaris-s'^&cies with smooth tubercles, 3) the species of Leiocidaris 

 Desor and Dames (emend.), 4) the recent species of the genns Phyllacanthus Brandt, 5) the genus 

 Stephanocidaris Ag, and 6) the genus Schleinitzia Studer. <Ainsi constitué, le genre Rhabdocidaris 



') Prodromus descriptionis animaliutn ab. H. Merteiisio in orbis terrarum circumnavigatione obsen-atorum. 1S25 p, 6S. 



