On Ascension-Island Zoology. 437 
3. Tripneustes angulosus, Leske. 
One specimen, without spines; abactinal area complete. 
4, Hchinometra subangularis, Leske. 
One specimen, of moderate size ; no spines. 
This is doubtiess the ‘small Warted Barbadoes Sea Ege” 
which was collected by James Cuninghame at Ascension 
about 1699 *. 
5. Hehinoneus cyclostomus, Leske. 
Five specimens, all in good condition, and three quite 
richly covered with spines. 
6. Rotula dentata, Leske. 
Two specimens, without spines—one only slightly injured 
and still pale green in parts, the other bleached and more 
broken. : 
7. Linckia diplax, M. & Tr. 
A large specimen, with four long and two very short arms, 
which I am unable to distinguish from a specimen of L. diplax 
that was determined by Prof. Perrier. 
All the above specimens arrived dry ; an Ophiurid in spirit 
is not in accndition to be certainly determined. 
The species enumerated are all forms with a wide dis- 
tribution; and none of them are at all specially character- 
istic of the eastern coast of the American continent; indeed 
Diadema setosum and Echinometra subangularis (with the pos- 
sible, though very doubtful}, case of Tripneustes angulosus) 
are the only forms that seem as yet to have been found 
in that region. On the other hand, D. setosum, E. subangu- 
laris, and Rotula dentata have ail been found on the eastern 
shores of the Atlantic; the last-mentioned would appear to 
be the only species in this collection which is confined to the 
western side of the African continent. The other species 
(Cidaris metularia, Tripneustes angulosus, Hehinoneus cyclo- 
stomus, and Linckia diplax) are only to be found when we 
touch the Cape of Good Hope or pass from it into the great 
ocean on the eastern side; from this statement the island of 
St. Helena will probably have to be excluded. 
As compared with the Mollusca, it is of interest to note 
* See Phil. Trans. vol. xxi. p. 298. 
+ P.Z.'S. 1879, p. 661. 
