GONIOCIDAKIS TUBARIA. 397 



color ; papillae quite short. Primary spines fluted, swelling near base, cupuli- 

 form at tip ; near upper part of spine fluting often broken up into discon- 

 nected lamellae, or forming rugose projections, apparently irregularly scat- 

 tered. 



Median ambulacral space broad, sloping towards median line ; each plate 

 covered in central part with closely packed miliaries, forming five to six 

 irregular vertical rows of horizontal and vertical sutures, deeply furrowed, 

 ridges thus formed meeting almost on the median line. Poriferous zones 

 narrow, with high ridge separating the pairs of pores. 



East India ; Australia. 



Goniocidaris tubaria 



! Cidarites tubaria Lamk., 1816, An. s. Vert. 



! Goniocidaris tubaria A. Ag., 1872, Rev. Ech., Pt. I. p. 131. 



PI. I'.f. 32 -36; PL P.f. 9-14. 



Test somewhat flattened, eight primary tubercles ; vertical and horizontal 

 furrows of median line of coronal plates forming a continuous groove from 

 abactinal system to buccal membrane. Scrobicular circle elliptical ; mam- 

 mary boss small, not prominent. Three to four rows of small miliaries, 

 concentric with the row of secondary scrobicular tubercles, upon each inter- 

 ambulacral plate, with a narrow band of similar miliaries separating primary 

 tubercles from the poriferous zone. 



Primary spines somewhat swelling at base, tapering, cupuliform ; shaft of 

 spines ornamented by irregular longitudinal rows of small, flattened, discon- 

 nected, pointed lamella?, forming diminutive spines. Color of spines is green- 

 ish-yellow, with numerous pink patches of color scattered irregularly over 

 the shaft of the spine. Spines frequently smooth, regularly striated longitudi- 

 nally, by extremely fine granulation, with irregular spots of dark violet 

 scattered upon a pinkish-yellow ground-color. Secondary spines and papillae 

 yellowish at base, tipped with brown. Plates forming abactinal system 

 covered with miliaries near centre only, leaving broad bare sutures between 

 all the plates. Genital openings small, placed near centre of the genital 

 plates, in very centre of main patch of miliaries covering it. 



This species differs strikingly from G. geranioides in the structure of the 

 primary spines ; the differences in the size of the genital plates and abactinal 

 system giving excellent characters by which these two species are easily 

 distinguished. 



