ABYSMAL FAUNA, 265 
taken at station 146. (iv.) Colossendeis gigas, Hoek, a gigantic species, 
taken at the same time as the preceding, also at station 147, and 
again further north, in lat. 33° 42'S. (v.) A more slender species, 
C. leptorhynchus, Hoek, was taken in the same localities as (iv.) 
(vi). C. gigas-leptorhynchus, Hoek, a form intermediate between (iv) 
and (v.) was taken at station 158. (vii.) C. gracilis, Hoek, an eyeless 
form, though with the oculiferous tubercle persisting, was dredged at 
stations 146 and 147, (vili.) Phoxichilidium pilosum, Hoek, a very 
hairy Pycnogonid, was taken at stations 147 and 157. It represents 
the arctic deep-sea forms of the genus. Two other species occur else- 
where at abysmal depths. 
Several other species were taken round Kerguelen, but cannot be 
regarded as deep-sea forms. 
MOLLUSCA. 
Class I. —LAMELLIBRANCHIATA. 
The bivalves of the deep sea are said by Mr. E. A. Smith to 
“have a tendency to be without colour, and of thin structure.” 
“The species were apparently few in number in comparison with 
those of shallow water; and new and peculiar generic forms . . . are 
of even still rarer occurrence.” In this respect both the Lamelli- 
branchs and the Gasteropoda dredged by the Challenger proved 
disappointing. 
The following five species of Lamellibranch Mollusca were taken 
in our area from the depths:—(i.) Pecten pudicus, E. A. 8., from 
station 146, of the family Pzcriviws, (il.) Amussium meridionale, 
E. A. S., of the same family, and taken at the same locality, also at 
stations 158 and, outside the area, 302. The pigmented ocelli were 
absent from the mantle edge of this species. (iii.) Lyonsiella papy- 
raced, KE, A.S., of the family Awarrmros, was taken at station 157, as 
were the two remaining species. (iv.) Stlenta sarsit, E. A. 8, an 
allied form of the same family ; also at station 325 at the mouth of 
the Rio de la Plata. (v.) Newra (Cuspidaria) meridionalis, E. A.S., an 
excessively thin-shelled member of the family Cusprparis, was also 
taken in our area. 
Class II.—GASTEROPODA. 
No IsopLeuRouS GASTEROPODA were taken at any very great 
depths in the Antarctic, the deepest capture being perhaps the Chiton 
Lepidopleurus dorsuosus, Hadd., taken at station 1454, at 310 
fathoms. 
