CHAP, If. | THE CRUISE OF THE ‘ LIGHTNING, 75 
abyssicola, Sars, and the exquisitely delicate trans- 
parent clam, Pecten vitreus, CHEMNITZ. Holtenia 
extends from the Butt of the Lews to Gibraltar, in 
from 500 to 1,000 fathoms. Mr. Saville Kent, 
dredging in Mr. Marshall Hall’s yacht ‘ Norna,’ found 
a singular variety off the coast of Portugal, which 
from its flatter, more hemispherical form, and more 
rigid anchoring spicules, probably inhabits a firmer 
medium.' 
As might be expected, the Atlantic ooze of this 
station, rich in rhizopods giving an ample supply of 
food, and with a comparatively mild climate, yielded 
many living forms belonging to various orders. Along 
with Globigerine and other small forms there were 
many large rhizopods, among them Rhabdammina 
abyssorum, SARS, a singularly regular triradiate sandy 
form of a bright orange colour, and very hard; from 
analyses made by Dr. Williamson at the request of 
Dr. Carpenter, its hardness is apparently owing to 
the cement employed by the animal in the construc- 
tion of its case containing phosphate of iron, the 
only instance of the use of this substance for such 
a purpose of which we are yet aware: Astrorhiza 
limicola, SANDAHL, a large irregularly-formed rhizo- 
pod with a soft test of mud and sand: many large 
Cornuspire and Textularia, and large Bi- and Tri- 
loculine and other miliolines: a few zoophytes, and 
especially common the curious sea-pen Kophobelem- 
1 On the Hexactinellide, or Hexradiate Spiculed Silicious Sponges, 
taken in the ‘Norna’ Expedition off the coast of Portugal; with 
Description of New Species and Revision of the Order. By W. Saville 
Kent, F.L.S., F.R.M.S, of the Geological Department, British 
Museum. (Monthly Microscopic Journal, November Ist, 1870.) 
