278 Mr. J. E. Gray’s Synopsis of 
1. Stellaster Childrenit. Back convex, with 1 or 2 blunt tubercles 
on the angles of the centre, arms three quarters the length of the 
width of the body, narrow, attenuated to a blunt recurved tip. 
Young, back without any tubercles. 
Inhab. China or Japan? 
4. Compronia, Gray. 
Body depressed, spinose? dorsal and oral disk covered with very 
small flat plates, marginal ossicula large, without any mobile spines. 
1. Comptonia elegans, Gray. Fossil. Black Down. 
The fossil genus Caxaster, Agassiz, from Maestricht, appears to be 
most nearly allied to this genus, but the plates of the oral disk 
(which alone are known) appear to be linear longitudinal. 
*** Body pentagonal, formed of variously shaped rather rough os- 
sicula sunk into a naked skin, with a single series of spine-bearing tu- 
bercles. 
5. Gymnasteria, Gray. 
1. Gymnasteria spinosa. Rays triangular, tapering, about one 
quarter longer than the width of the body, with a dorsal series of 
conical cylindrical tubercles. Young with a few spines on the mar- 
gin and back of the arms. Allied to Poranta. 
Inhab. Panama, fine sand, 16 fathoms. H. Cuming, Esq. 
2. Gymnasteria inermis. Rays rapidly tapering, convex above 
without any spines. 
Inhab. Panama, fine sand, 10 fathoms. Half the size of the young, 
spined specimens of the former species. 
b. The ambulacra with 2 series of larger spines near the edge ; 
body depressed ; back flat. 
* The ossicula granulated, sunk in the skin, often spine-bearing. 
6. Pauuia, Gray. 
Body 5-rayed, formed of flat granulated spine-bearing irregular 
ossicula on the disk and margin without any 2-lipped pores. 
Paulia horrida. Chestnut brown ; spines acute. 
Var. Smaller, arms as long as the width of the body, rather ta- 
pering, spines smaller, blunt, rounded at the tip; back more closely 
granulated. 
Inhab. Punta Santa Elena. Rocky ground, 12 to 18 fathoms. 
H, Cuming. Esq. 
7. Ranpasia, Gray. 
Body pentagonal, with a tubercular skin above, and large granu- 
lar plates beneath and on the margin, without any 2-lipped slits, but 
with one or two small pores near the oral angle beneath, where the 
tubercles are rubbed off. Allied to Cuncira. 
1. Randasia Luzonica. Thick, brown, the tubercles of the under 
side unequal, the larger ones flat-topped: sides straight. 
Inhab. Island of Lugon, in the Port of Sual. AH. Cuming, Esq. 
ke SRee 
