cnap. un] THE CRUISES OF THE ‘ PORCUPINE: 101 
The scientific staff consisted of Dr. Carpenter, 
Mr. P. Herbert Carpenter (who had gone through his 
apprenticeship in making analyses under unfavourable 
circumstances in the former cruise with Mr. Hunter, 
and was now prepared to undertake this task on his 
own account), and myself; and our intention was, in 
accordance with our original programme, to go care- 
fully over again the region which we had examined 
in the ‘ Lightning,’ to test with better appliances and 
more trustworthy instruments the singular distri- 
bution of temperatures in the ‘warm’ and ‘cold’ 
areas, to map out as accurately as we could the 
paths of the warm and cold currents, and to deter- 
mine the influences of these currents upon the 
character and distribution of animal life. 
We left Stornoway on the afternoon of Sunday, 
the 15th of August, and made straight for the scene 
of our most successful ‘warm area’ dredging of the 
year before. We were equally successful on this 
occasion, and procured several good specimens of 
Holtenia, anda beautiful series of Hyalonema, ranging 
from 2 mm. in length up to 30 and 40 centimetres, 
and thus giving all the stages in the development of 
the wonderful ‘glass rope,’ and proving to demon- 
stration its relation to the body of the sponge— 
Dr. J. E. Gray’s so-called Carteria. 
The most interesting novelty, however, which re- 
warded us was a very fine Echinid belonging to the 
Cidaridee to which J had given the name Porocidaris 
purpurata (Fig. 11). I believe I am justified in 
referring this handsome species to the genus Poroci- 
daris, although in it the special character is absent 
on which that genus was founded by Desor. Some 
