GENERA AND GKOUPS OF THE ECHINOIBEA. 131 



from that of his father, and which may stand for the generic 

 attribute of three out of the four species admitted and just 

 noticed. T. pileolus cannot well enter, as De Loriol has shown, 

 (Ech. de rile Maurice,' p. 27). 



Grenus Toxopneustes, A. Agassiz, 1872-4, Revision, p. 297. 

 {Limited.) 



Non Agassiz, 184*1, Pref. Monogr. d' Ech. viv. et foss. livr. 4, 

 p. ix, = Strongylocentrotus, Brandt, 1835. 



Test moderate in size, circular or subpentagonal in tumid mar- 

 ginal outline, subcorneal, broader than high. 



Apical system well developed, some radial plates entering the 

 periproctal ring or not. 



Ambulacra moderately broad ; the pairs of pores forming broad 

 arcs of three pairs, rather close vertically, and the pairs of the arc 

 not far apart ; the inner pairs of pores are adoral in the triple 

 compound plates, which are like those of Echinus. Interpori- 

 f erous areas with two principal vertical rows of plain imperforate 

 primary tubercles moderate in size, with rows of secondaries with 

 or without granules ; most tubercles at and below the ambitus. 



Interradia with several vertical rows of primary tubercles 

 resembling those of the ambulacra, diminishing to two near the 

 apex, granular or not. Bare median spaces variable or none. 



Peristome large, usually but not invariably with deep incisions 

 for the branchiae. Jaws and teeth as in ^cAwm*. Buccal plates 

 and also concentric, wide, low plates in the membrane. Spines 

 short, moderately stout. 



Recent. From the coast of Brazil to Carolina inclusive, and 

 the Caribbean Islands ; Bermuda ; Christmas Island ; Bourbon ; 

 G-alapagos; Central (Pacific) America. 



Toxopnetistes pileolus, A. Kg., =■ Echinus pileolus., Lmk., is a 

 Boletia. 



Grenus Boletia, Desor, 1858, Synopsis, p. 133 ; 1847, Catal. 

 Bais., Ann. d. Sci. Nat. vol. vi. p. 58. Verrill, 1871, Notes 

 on Badiata, p. 581. De Loriol, 1882, Ech. de Vile Maurice, 

 p. 27. 

 Syn. Toxopneustes (pars). 



Test moderate and large, thick, subpentagonal at the tumid 

 ambitus, subcorneal dorsally, concave actinally, broader than high ; 

 the ambulacra projecting somewhat. 



9* 



