ECHINOIDEA. I. 



^72> 



To adopt the nanie of pislil/ans in stead of bacnlosa I must, for tlie reasons given above, regard as 

 unwarranted. 



Schlchiitzia crenularis (p. 20). — The specimen figured by Studer cannot be identified any 

 longer with certainty in the museum of Berlin; a dried specimen without label reserables the figure 

 rather much, but not quite — it is C. bacnlosa var. ai/inilifcra. Two other specimens in alcohol are 

 Stephanocid. hispinosa^ a form with little thorny spines as in var. rainsayi Doderl. (op. cit. p. 697), In 

 the glass together with ene of these specimens is found a loose spine of C. bacnlosa var. ai/nnlifrra. 

 No more specimens are found in the museum of Berlin. Thus Sclilciiutzia crenularis is = Cidaris bacn- 

 losa var. aunnlifcra and Stcphanoc. bispinosa. 



Acaniliocidaris cnr7'al/sp/n/s (p. 21). Of this species I found a specimen, also from IVIauritius, 

 in the museum of Paris, cailed Dorocidarisf The globiferous pedicellariæ are quite as in the type 

 specimen; sometiraes the two outmost teeth at the moiith may be united at the jjoint and thus form 

 an apparent end tooth. Tridentate pedicellariæ were not found on this specimen. 



Histocidaris clcgans (pp. 21 — 22). By a renewed examination of all the specimens in British 

 Museum I have not been able to find any globiferous pedicellariæ; accordingly the val ve figured on 

 PI. IX. Fig. 2, with two end-teeth is evidently an abnormity having nothing to do with this species. 

 The genus Histocidaris then seems only to have tridentate pedicellariæ. 



Sfcrcocidaris nnlrix [Gouioc.iucnibravipora Studer) (p. 26). I have examined all the specimens 

 of this species in the museum of Berlin; none of them have young ones on the periproct, but two 

 have young ones round the mouth, quite as described by Wyv. Thomson. The remark by Studer 

 quoted on p. 26 is thus incorrect, it must apply to his G. vivipara. No specimen of this species in the 

 museum of Berlin carries any longer young ones, but some young are lying in a conple of small 

 glasses together with them. Accordingly my interpretation of Stcrcoc. nnlrix and canalicnlafa is no 

 doubt correct. 



Porocidaris pnrpnrata. A couple of large, fine specimens in the museum of Paris (Talisman > 

 Riv. Ouro. 1439 m.) differ from the common form \>\ the faet that in the uppermost (1 — 2) radioles of 

 each series the neck iS swollen in a fusiform manner and of a fine violet colour; the other spines are 

 quite cylindric. Otherwise it agrees with pnrpnrata, also the pedicellariæ are quite as in this species. 

 I supjjose it to be a separate species, but as I can give no other characters of it, I shall onh- desig- 

 nate it as a variety of P. pnrpnrata under the name of var. Talismani n. var. 



Dorocidaris tiara. Of this species I have examined a specimen from Calcutta in the collection 

 of de L or i ol. With regard to spines and pedicellariæ it agrees exactly ^^xWx Stcpliaitoc. bracteata[K^), 

 and so it is evidently a synonym of this species. 



Phormosonia placenta. After the printing of the section of the Echinothurids, a glass was found 

 with some small young ones of this species from st. 25; the .smallest ones have only a diameter of 

 3™", and are thus considerably smaller than the yonngest stages of Echinothurids hitherto known"). 

 Thus it will be of great interest to get information of these younger stages. Agassiz has, in 

 «Blake<-Echini, given some informations of the development of Phorinoso7na, but as the yonngest of 



I) The specimen of Asllienosoma. hystrix of 3,1™™, meutioned and figured in Rev. of Ech. p. 273 (PI. II. c.j is scar- 

 cely an Echinothurid; at all events there is neither in the description nor m the figures anything showing it. 



