ECHINOIDEA. I. 2 , 



is peculiar (PI. XI. Fig. 24) with no trace of roughness on the surface. Perhaps the specimen of 

 Porocidaris Sharrcri mentioned by Agassiz (9 p. 13) which was of a light greenish pink color when 

 alive, the spines white with a delicate brownish-pink base* is identical with the specimen described 

 here -- in this case 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 Sharreri. 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. incerta Koehler (2333), of which species Prof. v. Beneden has lent me a speci- 

 men for examination, a Porocidaris. I have only found one form of globiferous pedicellariae on it; it 

 has no end-tooth, the opening small, round (PI. VIII, Fig. 31). Most likely another, larger form 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 radicles. The spicules are simple. 



Of the other species that have been referred to Porocidaris, P. Cobosi most likely is a genuine 

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

 the present nothing can be said with certainty of P. Milleri and misakiensis; according to Agassiz 

 (13) P. Milleri is closely allied to P. clcgans. On the other hand it may be said with certainty that 

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

 recall to some degree those of Goniocidaris> canaliculata; tridentate pedicellarise unknown. Perhaps 

 it ought to form a separate genns. 



The genera Stercocidaris and Goniocidaris to which a whole series of species have been referred, 

 are still left. -The species referred to Stereocidaris : japonica, grandis, sceptriferoides , and the here 

 described new species St. ingolfiana agree in the structure of the pedicellarise: 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 pedicellarice chiefly of the same structure, without end-tooth; the tridentate 

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

 are rather large fenestrated plates, not thorny bows, as is else the case in the Cidarids this, 

 however, does not apply to all the species; in St. grandis they are of the common form, and so the 

 spicules give no reliable generic character. There is no reason to doubt that also St. indica Doderl. 

 really belongs to this genus, although we have no informations of its pedicellarise. Doderlein 

 further thinks (118) that Dorocidaris tiara and alcocki are perhaps only local forms of this species. Of 

 the species St. tcintispinus and microtuberculatus Yoshiw. nothing can be said with certainty. Whether 

 this group of species really belongs to the same genus as the 'fossil Stereoadart's-spedes , cannot be 

 definitely decided, until the pedicellarise of the latter are known; but 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 

 Stercocidaris 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., 



