ECHINOIDEA. I. 117 



the existing figures and the description (347) show distinctly that it is closely allied to gramt/ans. 

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



Sphærechiims granularis (Lamk.). All the ambulacral piates have a primary tubercle. The 

 bnccal membrane contains ontside of the biiccal piates only few, small fenestrated piates, but they are 

 thick and carry pedicellariæ, inside of the bnccal piates there are nnmerous small, little complicate 

 fenestrated piates. No spines on the buccal piates. The globiferous pedicellariæ, 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 ou the upper side. No 

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

 compact'). The tridentate pedicellariæ (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 abont half their length, but the slit between them is rather narrow. The length 

 of the head up to 2'"'". The oijhicephalous and triphyllons pedicellariæ of the common form. The 

 spicules in the globiferous pedicellariæ 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 siicking disk; 

 they are bihamate with small branches on the ontside at both ends — quite as in Toxopneustes 

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

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



SpJiærccIiiuus aiistraliff Ag. agrees with regard to spicules and pedicellariæ exactly with granu- 

 laris. Whether a primary tubercle is found on all the ambulacral piates, 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 piates, there can scarcely 

 be any doubt that the faet is the same in this species. In Challenger»-Echinoidea (p. 106) Sph. 

 australiæ is mentioned from st. 162 (Bass's Strait). In British Miiseum I have examined the specinien 

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

 pedicellariæ have one unpaired lateral tooth, and recall those of ».Strongyloccntrohis > tuberculatus 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 Sphærccliiinis. 



Sphærechimis pulchrrrii/nis (Barn.), as well by its whole habitus as by its spicules and pedicel- 

 lariæ, differs so much from the other Sphcrrfc-himis-species that there can be no question of referring 

 it to this genus. On the other hånd it shows great conformity with some Sirongylocenirohis-s-pecies 

 (infermct/itis and chlorocciitrflhis\ and so it will be more particularly mentioned together with these species. 



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

 generic division of Strongyloccntrottis\ the presence of deep, sharp cuts in the actinal system and the 

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

 facies, are simply quantitative characters, the valne 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 • Globiferæ» (Haniann 184) can onh- be interpreted as globiferous pedicellariæ, wliere 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 

 faet that animals which are attacked by the pedicellariæ, can tear off the heads of the globiferous pedicellariæ. The so-called 

 Tricltæ/ina paradoxa (Bar ro i s. 28), as is a well knowu faet, is only toru-off heads of globiferous pedicellariæ. 



