I CHINOIDEA. I. IT - 



the existing figures and the description 13471 show distinctly that it is closely allied to granulans. 

 The other three species I have examined, and can give some new informations of them. 



Sphmrechinus granulans lLamk.). All the ambulacral plates have a primary tubercle. The 

 buccal membrane contains outside of the buccal plates only few, small fenestrated plates, but they are 

 thick and carry pedicellaria; , inside of the buccal plates there are numerous small, little complicate 

 fenestrated plates. No spines on the buccal plates. The globiferous pedicellariae, which have often 

 been described and figured, have a tubular blade without lateral teeth (PI. XXI. Figs. 35, 37); the end- 

 tooth is peculiarly furrowed, so that it is a little difficult to see the open canal on the upper side. No 

 neck. Glands on the stalk are found (were formerly only known in this species), the stalk tubular or 

 compact 1 ). The tridentate pedicellarise (PI. XXI. Fig. 34) with a well developed net of meshes, almost 

 to the point of the blade; the edge is thick with an indication of transverse series of teeth. The 

 valves are apart for about half their length, but the slit between them is rather narrow. The length 

 of the head up to 2 mm . The ophicephalous and triphyllous pedicellaria; of the common form. The 

 spicules in the globiferous pedicellariae are slightly thickened at the ends (PI. XXI. Fig. 12), but not 

 really dumh-bell-shaped. In the tube feet only a few spicules are found just below the sucking disk; 

 they are bihamate with small branches on the outside at both ends -- quite as in Toxopncustcs 

 pileolus. In the buccal membrane, especially nearest to the gills, and in the gills, fine, genuine biha- 

 mate spicules are found; in the gills the usual irregular fenestrated plates are also found. 



Sphmrechinus australim Ag. agrees with regard to spicules and pedieellaria? exactly with granu- 

 laris. Whether a primary tubercle is found on all the ambulacral plates, I cannot tell with certainty, 

 as I have omitted the examination of this feature during my stay at British Museum; but as all other 

 polypore Echinids that I know, have a primary tubercle on all the ambulacral plates, there can scarcely 

 be any doubt that the fact is the same in this species. In Challenger -Echinoidea (p. 106) A'///. 

 australim is mentioned from st. 162 (Bass's Strait). In British Museum I have examined the specimen 

 upon which this statement rests, and have found that it is no Sphmrechinus at all. The globiferous 

 pedicellarise have one unpaired lateral tooth, and recall those of Strongylocentrotus tuberculatum very 

 much; otherwise I shall not decide to which genus and species this young specimen belongs, but rest 

 satisfied with having pointed out that it is no Sphmrechinus. 



Sphmrechinus pulcherrimus (Barn.), as well by its whole habitus as by its spicules and pedicel- 

 lariffi, differs so much from the other Sp/ia-rci///)///s-s-pecies that there can be no question of referring 

 it to this genus. On the other hand it shows great conformity with some Stro//gv/occ//frotzis-s-pecies 

 (intermedins and chloroccntrottis), and so it will be more particularly mentioned together with these species. 



Agassiz says of the genus Sphmrechinus: this genus can hardly rank as more than a sub- 

 generic division of Strongylocentrotus; the presence of deep, sharp cuts in the actinal system and the 

 regularity of the arrangement of the tubercles, although giving to the species of this genus a striking 

 facies, are simply quantitative characters, the value of which a better acquaintance with the subject 

 will determine (Rev. of Ech. p. 451). I shall readily admit that the difference between the deep slits 



1) The so-called -Globifera?" (Hainan n 1S4) can only be interpreted as globiferous pedicellariae, where the glands on 

 the stalk have been highly developed at the cost of the head. The head is perhaps even torn off; at all events it is a sure 

 fact that animals which are attacked by the pedicellarise, can tear off the heads of the globiferous pedicellaria;. The so-called 

 Trichcelma paradoxa (Barrois. 281, as is a well known fact, is only torn-off heads of globiferous pedicellariae. 



