94 ON A NEW SPECIES OF STOMOPNEUSTES, ETC. 



and somewliat depressed, enamelled. Scrobicular area large 

 elevated. Actinal surface flattening suddenly and conspicuously 

 from tlie ambitus, and the tubercles thereon nearly uniform and 

 gradually diminishing in size and number to the actinosome, 

 which is of medium size, with the notches hroad and rather deep. 

 Auricles small, arch complete with a square summit and a 

 somewhat oval or perfectly round foramen. Lantern tall, arches 

 stout, and solid, teeth narrow, rather long, acute. Anal system 

 small pentagonal. Genital plates, large, irregularly quadrate, 

 with the pore large, subcentral or a tendency towards the outer 

 edge. Ocular plates small subquadrate. Both kind of plates 

 with secondary and miliary tubercles. Madreporic body large, 

 somewhat elevated, broadly heart-shaped, pore quite on the outer 

 edge, with scattered miliaries. Inner plates numerous, decreasing 

 in size to an eccentric depression. Spines numerous ; of almost 

 hlach purple color, blunt, slender, but somewhat swollen in the 

 centre, very finely grooved longitudinally. Miliary ring con- 

 spicuous but of uniform color. The secondary and miliary spines 

 cylindrical. 



The diflerence between this species and S, variolaris are : 

 1. The size, it being twice and a half times larger. 2. The color. 

 3. The disposition of the tubercles. 4. The size of the anal 

 system. 5. The form of the genital, ocular, and madreform 

 plates. 6. Actinal cuts. 7. The groove, which is less waved. 

 I have in this diagnosis marked the special differences in italics. 

 In page 198, Yol. v., Lin. Soc. N. S. Wales Proc, the specific 

 name is misspelt atropurpurea. 



HiPPONOE VARIEGATA, Leshc, var. alha noh's, Plate 7. 

 I here figure a small and very interesting variety of this most 

 variable species, in which the spines are small and slender, and 

 the color white, with the test a rose pink. Usually in the tropics 

 the color is pale violet almost approaching blue. In Sydney, 

 if we are to regard the species as the same, the size is very much 

 larger, and the test a deep purple brown. 



