ECHINOIDEA. I. 23 



is peculiar (PI. XL Fig. 24) with no trace of roughiie.ss on the surface. Perhaps the specimen of 

 Porocidaris ^'^arrrr/ mentioned by Agassiz (9 p. 13) <;which was of a light greenisli pink color when 

 alive, the spines white with a delicate brownish-])ink l)ase is identical with the specimen described 

 here — in this ca.se this specimen mentioned by Agassiz has certainly not been of the same species 

 as the one he figures; but this latter must, of course, keep the name of Sharrcri. There can be no 

 doubt that the specimen described here is a new species; whether it also is to be regarded as a new 

 genus, or belongs to Dorocidaris, can only be decided, when the systematic .significance of the spines 

 has been established. For the present it ought to be classed with Dorocidaris^ under the name of 

 D. micans n. sp. 



Neither is P. iiiccrfa Koehler (233a), of which species Prof. v. Beneden has lent me a speci- 

 men for examination, a Porocidaris. I ha\e only found one form of globiferous pedicellaricC on it; it 

 has no end-tooth, the opening small, round (PL VIII, Fig. 31). Most likely another, larger fonn of 

 globiferous pedicellarise will be found in this species; but the figured form is a sufficient proof that 

 this species has no relation to Porocidaris. Koehler also refers it only in a doubtful way to Poro- 

 cidaris on account of the highly dentate actinal radioles. The spicules are simple. 



Of the other species that have been referred to Porocidaris.^ P. Cobosi most likel}' is a genuine 

 Porocidaris^ but it cannot be decided with certainty, till the pedicellarise have been examined. For 

 the present nothing can be said with certainty of P. Miller i and i/iisakiensis:, according to Agassiz 

 (13) P. Millcn is < closely allied to P. clcgans'>. On the other hand it ma\- be said with certaint>- that 

 P. gracilis Doderl. is no Porocidaris. Its globiferous pedicellarice of which only one form is known, 

 recall to some degree those of Goiiiocidaris caiialiculata; tridentate pedicellariie unknown. Perhaps 

 it ought to form a separate genus. 



The genera Sfercocidaris and Goniocidaris to which a whole series of species ha\-e been referred, 

 are still left. The species referred to Sfercocidaris : japonica, grandis, sccptri/croides, and the here 

 described new species St. ingolfiana agree in the structure of the pedicellarice: there is no end-tooth, 

 and the large opening reaching to the very point is broad and well limited below, quite narrow above. 

 The small globiferous pedicellarias chiefly of the same structure, without end-tooth; the tridentate 

 pedicellariEC seem to show no special peculiarities (they are not known in all the species). The spicules 

 are rather large fenestrated plates, not thorn)- bows, as is else the case in the Cidarids — this, 

 however, does not apply to all the species; ni .S7. grandis the>- are of the connnon form, and so the 

 spicules gi\-e no reliable generic character. There is no reason to doubt that also Sf. indica Doderl. 

 reallv belongs to this genus, although we have no informations of its pedicellarias. Doderlein 

 further thinks (118) that Dorocidaris fiara and alcocki are perhaps onh- local forms of this species. Of 

 the species St. tcmtispinus and inicrotnbcrctilahis Yoshiw. nothing can be said with certainty-. — Whether 

 this group of species really belongs to the same genus as the fossil Stereocidaris-'=,^&Q\&^, cannot be 

 definitely decided, until the pedicellariEe of the latter are known; Init the probability is that they 

 really belong here, and there is no reason, at all events not for the present, to reject the name of 

 Stereocidaris for them. 



To the genus Goniocidaris, the only one of the hitherto admitted genera that has been com- 

 monly acknowledged, the following species have been referred: geranioides Lamk., tubaria Lamk., 



