ECHINOIDEA. I. 



117 



the existing- figures and the description (347) sliow distinctly that it is close!)- allied to graiiitlaris. 

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



Sphmrechinus granularis (Lamk.). All the anibnlacral plates have a primary tubercle. The 

 buccal membrane contains outside of the buccal plates oul\- few, small fenestrated plates, but they are 

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

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

 been described and figured, have a tubular blade without lateral teeth (PL 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 ')• 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™™. The ophicephalous and triphyllous pedicellarise of the common form. The 

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

 reall\- 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 Toxopneusies 

 pilcolus. 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. 



Spliccrcchiuiis aastraliir Ag. agrees with regard to spicules and pedicellarise exactly with grami- 

 laris. Whether a primary tubercle is found on all the anibnlacral 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) Spli. 

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

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

 pedicellarise have one unpaired lateral tooth, and recall those of Sfrongylocentrohis^ tuber culatus 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 Spha-rcchimis. 



Spharechinus pnlclterriiinis (Barn.), as well by its whole habitus as by its spicules and pedicel- 

 larise, differs so much from the other Splurrccliinus-s^zz\&?< that there can be no question of referring 

 it to this genus. On the other hand it shows great conformity with some Strongylocentrotus-s'^^cxt.s, 

 {intermedhis and chlorocoitrotits), and so it will be more particularly mentioned together with these species. 



Agassiz says of the genus Spha-rt'chiiuis: this genus can hardly rank as more than a sub- 

 generic division of Strotigyloccnfrofus; 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 



I) The so-called Globifer;e» (Hamann 184) can only be interpreted as globiferous pediceUarire, where the glands on 

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

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

 Trichalina paradoxa (Barrois. 28), as is a well known fact, is only torn-off heads of globiferous pedicellarije. 



