CHAP. V.] THE GULF-STREAM. 049 
and the delicate Orbitolites tenuisst- 
mus. Star-fishes and ophiurids were 
abundant chiefly on the - tangles; 
among the former several fine species 
of Archaster, apparently undescribed, 
although approaching very closely 
forms from the seas of Shetland and 
Farée, and among the latter some re- 
imarkably large examples of Ophiomu- 
sium Lyman. 
We took here a second specimen of 
an irregular sea-urchin which we had 
found previously at Station VIIL., off 
Gomera Island, in 600 fathoms, for 
which I propose the name Aceste belli- 
difera (Fig. 95). This appears to be 
one of a wide-spread and characteristic 
deep-sea family to which Pouwrtalesia 
belongs. As pointed out by Professor 
Alexander Agassiz, this family is cer- 
tainly allied in many respects to the 
Ananchytide ; but there are important 
points of divergence, and when we 
have had an opportunity of comparing 
them carefully, it may possibly be nec- 
essary to define a new family for the 
reception of a considerable number of 
“AITX TONNNIS 18 aINJVIedWay, PUB YJdeg UdaMjJeq TOYLIAY ey) SULMOYS UVisviq—'Fr6 ‘PIT 
kindred forms. In the present species 
the test is oval and depressed. The 
apex, with the madreporic tubercle, 
and two very large ovarial openings, is 
on the dorsal surface near the posterior 
extremity ; the mouth is rounded or 
somewhat irregular in form, and is at 
I—23 
