92 THE DEPTHS OF THE SEA. [CHAP. IIT. 
thin as paper. From its extreme tenuity and the 
ease with which the rings and chamberlets of which 
it is composed separate from one another, all our 
large specimens were more or less injured. All 
the chamberlets are on the same plane; this spe- 
cies therefore belongs to the ‘simple type’ of the 
genus, though the form of the chamberlets corre- 
sponds, as Dr. Carpenter has pointed out, with those 
of the superficial layer in the complex type. Another 
peculiarity which Dr. Carpenter regards as of special 
importance in its general bearings, is that, instead of 
commencing with a ‘central’ and ‘ circumambient ’ 
chamber like the ordinary Orditolites, this form com- 
mences with a spine of several turns like that of a 
young Cornuspira, thus showing the fundamental 
conformity of this cyclical type to the spiral plan of 
erowth.! 
As I have already mentioned, it was the original 
intention to devote the second cruise to the exploration 
of an area to the west of the outer Hebrides, between 
Rockall and the south-western limit of last year’s 
work in the ‘Lightning.’ During the first cruise, 
however, dredging had been carried down successfully 
to a depth of nearly 1,500 fathoms; and the result 
so far realized our anticipations, and confirmed the 
experience of last year. The conditions (to that 
great depth at all events) were consistent with the life 
1 Researches on the Foraminifera. Part I. In the Philosophical 
Transactions of the Royal Society of London for the year 1855, 
P. 193 et seq. 
Introduction to the Study of the Foraminifera. By William DB. 
Carpenter, M.D., F.R.S., F.L.S., F.G.8., &e. Published for the Ray 
Society, 1862. P. 106 et seq. 
