BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 9. N:O 19. 7 
a little larger, alternating with those of the inner. The odd ambu- 
lacerum with four rudimental pedicels, two of which side by side 
just before the anus. Processes of the lateral ambulacra of the 
trivium sixteen along the left, and fourteen along the right one, 
rigid, slightly flexible; their length varying, some being almost 
rudimental, others as long as half the breadth of the body. As 
to the foremost processes, it is rather difficult correctly to state 
whether they belong to these ambulacra or to those of the bi- 
vium. Processes of the bivium thirteen along the left, and twelve 
along the right ambulacrum, resembling the former in size and 
shape. Integument thin, but rather hard and brittle, with larger 
and smaller, irregularly rounded, perforated plates, either scat- 
tered or crowded, and then covering one another with their 
edges; each plate bearing near its centre one or more small 
spines or processes. 
Colour in alcohol, light gray. 
Length, 200 mm. 
Breadth, 86 mm. 
Station 146, 1375 fathoms, three specimens. 
Two of the individuals obtained, evidently young ones, differ 
from the above description, the one, thirty-four mm. by ten, as well 
as the other, ffty-three mm. by twenty, both of them having 
the mouth more ventral, and beimg of a peculiar colour, clear 
like glass; their pedicels and processes are a little different in 
number and size, the pedicels of the inner row being very small 
and rudimental, whereas the processes generally are very long. 
At stations 157, 160, 241, 244, 281, 299, many individuals 
have also been obtamed, differing however more or less from 
the specimen described above. They are all of them smaller, 
and the number of pedicels and processes vary much, not a 
single individual resembling another in this. The arrangement of 
the pedicels in double rows on each side of the ventral surface 
is often not so obvious as has been stated above, and in some 
individuals some tentacles are shorter than the rest. The cal- 
careous plates of different individuals vary also in appearance, being 
now destitute of spines and processes, now provided with many 
unbranched or branched ones. 
The specimens obtained from station 157 differ from all the 
rest by their more or less dark violet colour. 
