ECHINOIDEA. I. 23 



is peculiar (PI. XI. Fig. 24) with no trace of roughness 011 the surface. Perhaps the specimen of 

 Porocidaris Skarreri mentioned by Agassiz (9 p. 13) «\vhich was of a light greenish pink color when 

 alive, the spines white with a delicate brownish-pink base» is idehtical 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; bnt this latter mnst, of conrse, 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 

 genns, or belongs to Dorocidaris^ can only be decided, when the systematic significance of the spines 

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

 D. micans n. sp. 



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

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

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

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

 this sjDecies has no relation to Porocidaris. Koehler also refers it onl\- in a doubtful way to Poro- 

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



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

 Porocidaris., bnt it cannot be decided with certainty, till the pedicellariæ have been examined. For 

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

 (13) P. Milleri is ( closely allied to P. clcgans?>. On the other hånd it mav be said with certainty that 

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

 recall to some degree those of v-Goniocidaris canalicnlata:, tridentate pedicellariæ unknown. Perhaps 

 it ought to form a separate genns. 



The genera Stereocidaris and Goiiiocidaris 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. iiigolfiaiia agree in the structure of the pedicellariæ : 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 pedicellariæ chiefly of the same structure, without end-tooth; the tridentate 

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

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

 however, does not apply to all the species; in St. graiidis they are of the conimon 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 pedicellariæ. Doderlein 

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

 the species St. tcnuispinus and inicrotuberculatiis Yoshiw. nothing can be said with certaint)'. — Whether 

 this group of species really belongs to the same genus as the fossil Stereocidaris-s^QCi^s ., cannot be 

 definitely decided, until the pedicellariæ of the latter are known; but the probability is that the)- 

 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 Goiiiocidaris., the only one of the hitherto admitted genera that has been com- 

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



