452 SPHAERECHINUS GRANULARIS. 



In the interambulacral space there are from six to eight vertical rows of 

 large primary tubercles; near the median space, separating the principal 

 rows, closely packed secondary tubercles fill the rest of the coronal plates. 

 The coronal plates are high. The most prominent vertical row of primaries is 

 half-way from the median line to the poriferous zone. The abactinal system 

 is exceedingly compact and prominent ; anal system large, covered by small 

 plates carrying minute granulation ; ocular and genital plates covered by 

 secondary tubercles, genital ring narrow, genital pores large. 



Color of test violet with tubercles of whitish-green. Actinal membrane 

 covered by large prominent elliptical plates moderately closely packed to- 

 gether. Spines short, tolerably stout ; when dry, violet at base with green- 

 ish tips. 



Australia; Mauritius; Now Zealand. 



Sphaerechinus granulans 



! Echinus granulans Lahk., 1816, An. B. Vert. 



! Sphaerechinus granulans A. A.G., 1863, Bull. M. ('. Z.. I. 



PL V.f.r; PL VI.f.ie-17. 



Aradas, in his memoirs on the living and fossil Echini of Sicily, has given 

 an excellent account of the many varieties to be distinguished in this species, 

 and which usually have served as types of as many species. The variation 

 in the shape of the test of this species is perhaps not as great as in many of 

 the species of Echinus, but the differences due to the mode of tuberculatum 

 are so great as readily to excuse the citations of the many synonymes of this 

 species. Test somewhat depressed, regularly arched, slightly flattened below ; 

 sometimes test somewhat conical above. Abactinal system prominent. Anal 

 system large, covered by comparatively few large plates, with a number of 

 smaller ones in the centre. Genital ring narrow, madreporic genital larger 

 than the others. The ocular plates reach the anal system; they arc rectangu- 

 lar, elongate. The genital and ocular plates carry a few huge secondaries 

 near the anal system, with additional tubercles on the madreporic genital. 

 Poriferous zone somewhat sunken ; pores arranged in very irregular arcs, 



