ECHINOIDEA. I. 



To adopt the name of pistillaris in stead of baculosa I must, for the reasons given above, regard as 

 unwarranted. 



Schlcinitzia crcmilaris (p. 20). - The specimen figured by Stnder cannot be identified any 

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

 rather much, but not quite -- it is C. baculosa var. annuli/era. Two other specimens in alcohol are 

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

 the glass together with one of these specimens is found a loose spine of C. baculosa var. annulifcra. 

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

 losa var. annulifcra and Stcphanoc. bispinosa. 



Acanthocidaris curvatispinis (p. 21). Of this species I found a specimen, also from Mauritius, 

 in the museum of Paris, called Dorocidaris? The globiferous pedicellarise are quite as in the type 

 specimen ; sometimes the two outmost teeth at the mouth may be united at the point and truis form 

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



j ' fistocidaris clcgans (pp. 21 22). By a renewed examination of all the specimens in British 

 Museum I have not been able to find any globiferous pedicellarise; accordingly the valve figured on 

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

 The genus Plistocidaris then seems only to have tridentate pedicellariae. 



Stcreocidaris nutrix (Gonioc.mcnibranipora 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 couple of small 

 glasses together with them. Accordingly my interpretation of Stereoc. nutrix and canaliculata is no 

 doubt correct. 



Porocidaris purpurata. A couple of large, fine specimens in the museum of Paris (<:Talisman 

 Riv. Ouro. i439m.) differ from the common form by the fact that in the uppermost (1 2) radicles 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 purpurata, also the pedicellarise are quite as in this species. 

 I suppose it to be a separate species, bitt as I can give no other characters of it, I shall only desig- 

 nate it as a variety of P.purpurata under the name of var. Talisman! n. var. 



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

 of de L/oriol. With regard to spines and pedicellarise it agrees exactly with Stephanoc. bracteata (Ag.), 

 and so it is evidently a synonym of this species. 



Pkormosoma 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 youngest stages of Echinothurids hitherto known 1 ). 

 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 Phortnosonia, but as the youngest of 



') The specimen of *As/henosoma* hystrix of 3,l mm , mentioned and figured in Rev. of Ech. p. 273 (PL II. c.) is scar- 

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



