CHAP, III.] THE CRUISES OF THE ‘ PORCUPINE.’ jaa 
deep, flowing in a south-westerly direction, beneath 
an upper stratum of comparatively warm water 
moving slowly towards the north-east; the lower 
half of the latter, however, having its temperature 
considerably modified by intermixture with the 
stratum over which it lis.”’? 
Our next few dredgings were on the Shetland 
plateau, in depths under 100 fathoms, and over 
ground already carefully worked by our colleague 
Mr. Gwyn Jeffreys. We got few novelties, but 
owing to our very effective dredging appliances, we 
took some of the ‘ Haaf’ rarities, such as Fusus nor- 
vegicus, CHEMN.; Husus berniciensis, Kine; Pleuro- 
toma carinatum, BIvVONA; in considerable numbers. 
The hempen tangles stood us in good stead with the 
echinoderms. On one occasion the dredge brought up 
at a single haul, in the bag and on the tangles, cer- 
tainly not less than 20,000 examples of the pretty 
little urchin, Hehinus norvegicus, D. and K. 
On the 28th of August we anchored in Lerwick 
Harbour. We remained at Lerwick several days 
taking in necessary supplies, looking at the geology 
and the many remarkable antiquities of the neigh- 
bourhood, and ransacking the haberdashers’ shops for 
those delicate fleecy fabrics of wool which imitate in 
a scarcely grosser material, and with almost equal 
delicacy of design, the fretted skeletons of Holtenia, 
Huplectella, and Aphrocalilistes. 
In this earlier part of the cruise nearly all the 
dredgings had been confined to the cold area, and 
* Dr. Carpenter, in “ Preliminary Report on the Scientific Explora- 
tion of the Deep Sea, 1869.” (Proceedings of the Royal Society, 
vol. xvii. p. 441.) 
