ABYSMAL FAUNA. 271 
specimens from station 152. (vil) #. ambigua, Th., two injured 
specimens from station 157. (vili.) #. glacialis, Th., station 160. A 
number of this species are also known from the Kara Sea and the 
North Atlantic, but in much shallower water. (ix.) Peniagone affinis, 
Th., from station 147, numerous specimens. (x.) P. horrifer, Th., a 
single incomplete specimen from station 157. (xi) P. naresi, Th., 
one incomplete specimen from station 158. (xii.) P. challengeri, Th., 
two specimens from the same station. (xiii) P. atrox, Th, one 
damaged example from station 160. (xiv.) <Achlyonice lactea, Th., 
four specimens from station 147. (xv.) Letmogone wyville-thomsont, 
Th., from stations 147 and 158, and outside the area, from stations 
232 and 300. This is a very abundant species. (xvi.) Scotoplanes 
murrayt, Th., one specimen from station 152. (xvii.) S insignis, Th., 
one specimen from station 156. (xvili.) S. globosa, Th., from station 
157 and, outside the area, from station 299. (xix.) S. robusta, Th., 
from station 157; only one specimen. (xx.) S. mollis, Th., one 
specimen from station 160. (xxi). Benthodytes sordida, Th., from 
stations 156, 157, 158 and, outside the area, from station 298. (xxii.) 
B. sanguinolenta, Th. from stations 158 and 160, and outside the 
area, from station 298. (xxiii) Scotoanassa diaphana, Th., from sta- 
tion 160. 
Besides the family Hlpidiide, which are essentially and only 
deep-sea forms, and must have taken up their position in the depths 
countless ages ago, certain other Holothuroids, belonging to shallow- 
water forms, have more recently made their way to the depths, but 
these have, so far, undergone but little structural alteration. They 
include a very few Antarctic forms :—(xxiv.) Stichopus challengert, 
Th., of the family Hozorazvaro.s, taken at station 148. (xxv.) Tro- 
chostoma violaceum, Stud. from Kerguelen, at no great depths. 
(xxvi.) Pseudostichopus villosus, Th., from stations 146, 147, 156, 
157, and from numerous localities outside the area. The last two 
are members of the family Mozpapupx. 
TUNICATA. 
ASCIDIACEA. 
ASCIDLE SIMPLICES.—The following simple Ascidians were taken 
within our area:—(i.) Culeolus recwmbens, Herdm., a species with a 
small body and a long “ peduncle” or stalk, very flexible, like a piece 
of string, ending in a tangle of filaments which root it to the mud. 
Test thin and tough, coated with Foraminifera, Calcareous spicules 
in branchial sac. Taken at station 146. (ii.) C. perlucidus, Herdm., 
