ECHINOIDEA. I. 137 



Species: Tripii. csculcutus (Leske), drprcssus Ag., gratilla (L.). 

 Distribtition: Cosmopolitan in the warm zone. Littoral forms. 



Sphaerechinus Desor (emend.). 



Pores mnltio;eminate (generally fonr in each arc|; primar\' tnl)ercle on all the ambnlacral 

 plates'). Slits of the test rather deep; the bnccal membrane with rather nnmerons fenestrated plates; 

 no spines on these or on the bnccal plates. In the globiferons pedicellarise the blade is not mnch 

 lengthened. The spicnles of the globiferons pedicellarise small bows, not pointed at the ends; they 

 form no border. In the tnbe feet branched, bihamate spicnles are found. Large, short-spined forms, 

 almost globular. 



Species: Splicer ech. grmiularis (Lamk.), rosnis Russo, atistralue Ag. 



Distribution: The Mediterranean and the adjoining Atlantic coasts, Australia. Littoral forms. 



Pseudoboletia Troschel (emend.). 



Pores multigeminate (four in each arc); primary tubercle on all the ambidacral plates. Slits 

 of the test rather deep. The buccal membrane with rather numerous plates carrying both spines and 

 pedicellarice; spines are likewise found on the buccal plates. In the globiferons pedicellarise the blade 

 is not mnch lengthened. The spicules of the globiferons pedicellarise small bows, not pointed at the 

 ends; the\- form no border. The bihamate spicules in the tube feet are not branched. Large, high, 

 rather short-spined forms. 



Species: Fs. indiana (Mich.), maciilata Trosch. 



Distribution: The Indo-Pacific Ocean. Littoral forms. 

 Pseudocentrotus n. g. 



Pores multigeminate; primary tubercle on all the ambnlacral plates. The pore areas some- 

 what petaloid on the actinal side. Slits of the test rather small. The buccal membrane with numer- 

 ous fine fenestrated plates; no spines on these or on the buccal plates. In the globiferons pedicellarise 

 the blade is not mnch lengthened. The spicules of the globiferons pedicellarise bow-shaped, not 

 pointed at the ends; they form no border. The bihamate spicules in the tube feet are branched. The 

 spines rather long and strong; the test rather flat. 



Only one species known: Ps. dcprrssus (Ag.|. . 



Distribution: Japan. Littoral form. 



Subfam. Strongylocentrotinse n. subfam. 



The spicules of the globiferons pedicellarict bihamate (alwa>-s?), generally branched at the ends; 

 no dumb-bell-shaped spicnles, nor such as are not pointed at the ends. The globiferons pedicellarice 

 with well developed neck with longitudinal and circular muscles; tubular stalk. 



Genera: Strongylocentrotus^ Aiithocidaris. 



Strongylo centre tus Brandt (emend. |. 



Pores multigeminate; the pore areas not petaloid on the actinal side. Primary tubercle on 

 all the ambnlacral plates. The buccal membrane with numerous fine fenestrated plates most of 



') Not examined in Spli. aiistralia:. 

 The Ingolf-Expedition. IV. i. ^" 



