436 Deep-sea Trawling off the S.W. Coast of Ireland : 
Ill. OPHIUROIDEA. 
Ophiothriz pentaphyllum, Penn. 
Two large specimens from 200-315 fath., which would, I 
imagine, be referred to O. Luetkent, Wyv. Thoms.* ; I must 
own, however, that the variations exhibited among the better 
known littoral representatives of this species are so great that 
I cannot bring myself to look upon the specimens before me 
as anything more than large, well-marked individuals of this 
variable species. 
IV. ECHINOIDEA. 
Cidaris papillata, Leske. 
Taken at various stations, from 150 to 315 fath. ; as usual, 
in some localities the species was very abundantly represented. 
The specimens do not exhibit in any marked degree the varia- 
tion to which Prof. Wyville Thomson has called attention, 
for they may all be said to have the spines rather long and 
slender than stout. In a young specimen the echinulation of 
the spines is more marked than in those which appear to be 
adult. 
Phormosoma placenta. 
Phormosoma placenta, Wyv. Th. 
The capture of this species was perhaps the greatest of 
Mr. Green’s achievements ; so far as English naturalists are 
concerned the disappearance of the HEchinids described by 
Sir Wyville Thomson in the ‘ Philosophical Transactions’ 
for 1874 has been a misfortune, as they have never had the 
opportunity of examining this form for themselves ; the other 
specimens known to have been collected are those which were 
obtained by the ‘Knight Errant’ in the Feroe Channel f, 
and by the ‘ Blake’ in American waters; the only naturalist 
who has, so far as can be gathered, had the opportunity of exam- 
ining these specimens is Prof. Alex. Agassiz, who has chiefly 
occupied himself with describing the changes due to growth 
and discussing the affinities of these forms. Though such 
investigations are of interest and importance, we are still in 
need of that more elementary and less exciting information 
which consists in an adequate knowledge of the species itself 
* ‘Depths of the Sea,’ p. 100. 
+ With, it should be noted, dredging-apparatus provided at the expense 
of Sir W. Thomson; cf. Proc. Roy. Soc. Ed. xi. p. 644. 
