268 THE ANTARCTIC MANUAL. 
Arrou Islands. It seems commoner in the shallower seas than at 
great depths. (xix.) Brisinga membranacea, Slad., a form remarkable 
for the extremely delicate and rudimentary character of the abactinal 
skeleton, was taken at stations 146 and 147; and (xx.) Freyella 
Sragilissima, Slad., from stations 146 and 156. 
Class II.—OPHIUROIDEA. 
The following species of Ophiuroids were taken from depths 
exceeding 1500 fathoms in the Antarctic seas:—(i) Ophioglypha 
lovent, Lym., belonging to the family Orarozeripip., at stations 146, 
147, 157, 158, 160, an essentially Antarctic form; (ii.) O. lenosa, 
Lym., from station 157; (iii.) O. fraterna, Lym., from station 157; 
(iv.) O. minuta, Lym., from stations 146 and 158; (v.) O. lacazez, 
Lym., from stations 160 and (outside the area) 299; (vi) Ophiernus 
vallincola, Lym., from stations 146 and 156, and outside the area 
station 76, belongs to the same family; (vii.) Ophiocten amitinum, 
Lym., from stations 146, 152 and 157, belongs to the same family ; 
(viil.) Ophiocten hastatum, Lym., from station 146 and (outside the 
area) 78 and 168; (ix.) Ophiocten pallidum, Lym., from stations 156 
and 160. (x.) Ophiomitra sarsui, Lym., from station 146, belongs to 
the family Aueaivrina; (xi.) Ophiacantha cosmica, Lym.,from stations 
146, 147, 153, 156, 157, 158, and many others south of the equator, 
belongs to the same family. The last named species is very widely 
distributed in the Southern Hemisphere; (xii.) Ophiolebes scorteus, 
Lym., from stations 145 and 147, belongs to the same family ; (xiii.) 
Amphiura patula, Lym., from station 156; and (xiv.) Ophioplinthus 
medusa, Lym., from station 156, belongs to the family Orzrozermms; 
(xv.) Ophioplinthus grisea, Lym., from station 156; (xvi) Ophio- 
cymbium cavernosum, Lym., from station 157. This species belongs 
to the family Ameuivriwe. 
Class IIJ.—EcHINOIDEA. 
The deep-sea Echinoids have a markedly antique character, 
especially resembling the fossils of the Cretaceous formations. This 
feature, which is further emphasised by the Crinoid Hyocrinus, a 
deep-sea form, the only living representative of its genus, has been 
thoroughly described by Agassiz. 
Of the 50 abyssal species, nine (all belonging to allied families) 
occur in sub-Antarctic waters, and they include the strange Spatago- 
cystis, Echinocrepis and Genicopatagus, all of them characteristic of 
the Southern seas. These Antarctic species are further peculiar in 
