283 Zoological Society. 



spines ; sometimes placed in lines. The dorsal spines sometimes 

 truncated and slightly cupped at the tip ; ambulacral spinules nar- 

 row, flat. 



Hab. West Indies. 



4. CiDARIS SPINULOSA. 



Interambulacral tubercles small, very far apart ; spines elongate, 

 fusiform, red-brown, with close squamose longitudinal ridges and 

 scattered subverticillate acute and small spines ; the dorsal spines 

 truncated, cupped and spmose at the end ; ambulacral spinules 



narrow. — Hab. ? 



Genus Astropyga. 



5. Astropyga depressa. 



Shell depressed, very thin ; ambulacra swollen ; interambulacral 

 area with a very wide smooth band in the middle and on each side 

 of the upper part ; the lower part of the centre of each area with 

 three oblique series of larger tubercles; ovarian plate broad, trian- 

 gular. — Hab. ? 



Genus Garelia. 



Ambulacra broad ; the pairs of pores crowded, so as to form two, 

 or rarely three, series ; ambulacral area narrow, upper part with four 

 series of small, and lower part with two or four series of rather larger 

 tubercles ; spines of ambulacral area bristle-like, very slender ; in- 

 terambulacral area with several oblique series of larger tubercles, 

 without any smooth band on the back near the crown ; ovarian 

 plates moderate, triangular. 



* Ambulacra convex ; area linear ; spines elongate, subulate, hollow, 

 covered with whorls of lanceolate scales. 



6. Garelia ^qualis. 



Ambulacra convex ; ambulacral area with two series of tubercles, 

 the outer series rather the largest, rather narrowed below ; upper 

 side of ambulacral area with 5'5 oblique series of larger tubercles ; 

 ovarian plate elongate trigonal ; spines purple, or purple and white 

 ringed. 



Var. a. With spines pale, white-ringed. 



Var. /3. Spines purple ; underside obscurely pale banded. 



Far. y. Spines purple, not banded. 



Hab. Mauritius. 



** Ambulacra ^af ; area loide, with four or five series of spines, 

 near vertex narrow, with two series of tubercles below ; spines 

 subulate, tapering, longitudinally striated. 



7. Garelia clavata. 



Interambulacral area ^\ath four oblique series of larger tubercles ; 

 ambulacra slightly raised ; the upper part of the area near the crown 

 broad ; each side with two or four or six series of small tubercles ; 

 the lower part narrow, with a single series of rather larger tubercles. 



