396 GONIOCIDARIS GERANIOIDES. 



median ambulacra! space. Besides an outer row of comparatively large 

 secondary ambulacral tubercles, there are two irregular vertical rows on each 

 side of the median furrow, with a few miliaries scattered irregularly between 

 the secondary tubercles towards the poriferous zone. 



Genital plates in contact, irregularly pentagonal ; ocular plates lozenge- 

 shaped ; ocular pores near centre of plates; genital openings near edge. 

 There are but lew miliaries in the centre of each plate of the abactinal 

 system. The primary spines are comparatively slender, short, slightly taper- 

 ing, somewhat swelling at base, with indistinct fluting formed by lamellar 

 granulation. Ambulacral papillae somewhat rounded, longer and more slen- 

 der than the scrobicular papillae, which are considerably flatter. Covered 

 with its spines and papillae, this small species resembles strikingly in outward 

 appearance Dorocidaris papillata, with shorter spines. The color of test and 

 spines, to judge from drawings made by Captain Couthouy, at Orange Harbor, 

 Falkland Islands, is of a brilliant orange reminding us of the coloration of 

 Dorocidaris papillata (C. affinis of Philippi) from the Mediterranean. 



Patagonia ; Natal. 



Goniocidaris geranioides 



! Cidarites geranioides Lahk., 1816, An. s. Vert. 



! Goniocidaris geranioides A.GAS8., 1846, A.GA88. Cat. Rais. 



PL P.f. 15 -17 ; PL P.f. .1,4; PL XXIV. f. 12, is; PI XXXV. f. .7. 



Abactinal system uniformly covered by closely packed miliaries; sutures 

 of the plates of abactinal system well defined. Ocular plates large, triangu- 

 lar; genital plates of uniform size, adjacent sides in contact ; genital openings 

 large, placed near edge of plates. Anal system small, pentagonal, covered 

 by a moderate number of plates. Test high, thick ; as many as ten primary 

 tubercles. Scrobicular circle small, circular, well defined by a, close row of 

 secondary tubercles. Horizontal sutures of coronal plates left hare, bevelled 

 towards the median interamhulacral region ; the angle of the plates terminat- 

 ing in a deep pit, the rest of the plate covered by closely packed secondary tu- 

 bercles, diminishing gradually in size towards the median line. A narrow band 

 of similar tubercles extends between the primary tubercles and the poriferous 

 zone. The vertical line of median sutures is vaguely defined, left bare, but 

 not deeply sunken. In young specimens the vertical lines of sutures alone 

 are left bare, and the pits at angles of plates scarcely sunken. Mammary 

 boss small, but projecting. Secondary spines rather short, of a brownish-red 



