CHAP. III. | THE CRUISES OF THE ‘ PORCUPINE,’ 1s 
each marginal plate covered with miliary grains, 
and with a prominent rigid central spine. This is 
a large form, one of our most striking additions to 
the tale of known species. It measures 120 mm. from 
tip to tip of the arms across the disk. The colour 
is a rich cream, or various shades of light rose. 
Ctenodiscus crispatus occurred rarely and of rather 
small size, not more than 25 mm. across. Nearly 
every haul brought up small specimens of <Aster- 
acanthion milleri, M. Sars, and specimens of all sizes 
of Cribrella sanguinolenta, O. F. MULLER. 
The distribution of Ophiuroidea was altogether 
new to a British dredger. By far the most abundant 
form in moderate depths was Amphiura abyssicola, 
M. Sars, a species hitherto unknown in the British 
seas ; and at greater depths this species was associated 
in about equal numbers with Ophiocten sericeum, 
ForzBEs. 
Everywhere Ophiacantha spinulosa, M. and T., 
abounds, and the common Ophioglypha lacertosa of 
shallow water is replaced by 0. sarsii, LUrKkeEn, 
while Ophiopholis aculeata, O. F. MULLER, loves to 
nestle among the branches of corals and stony 
polyzoa. In such characteristic cold area dredg- 
ings as Stations 54, 55, 57, and 64, we find the 
two species of Ophioscolex, O. purpurea, D. and 
K., and O.:glacialis, M. and T.; the former in 
some places in great abundance, and the latter 
much more scarce. Both species are new to the 
British area, and two very remarkable forms which 
accompany them are new to science. One of these 
is a very large ophiurid with thick arms, up- 
wards of three decimetres long, and a large soft disk 
