3 
116 ‘* ENDEAVOUR” SCIENTIFIC RESULTS. 
is similar to the latter specimen, the primaries being almost 
wholly white, though the test is distinctly greenish. The 
South Australian specimen is the most peculiar, for while the 
test is greenish and not very unusual, the primary spines are 
all pale reddish with light tips; actinally the light shade 
occupies more of the spine than the reddish tint. All the 
specimens show a zigzag band (similar to that of A. formosus) 
in the abactinal interambulacra, indistinct when the test is 
dry but very evident when the surface is moistened; the 
markings differ obviously from those of A. formosus, how- 
ever, by being darker than the intervening angles. 
Déderlein! has recently reviewed anew the species of 
Amblypneustes, adding another species and a variety to the 
already perplexing list. He is inclined to doubt the validity 
of both the present species and the next, considering them 
forms of A. grisens, but I am unable to agree with him. I 
confess, however, that I do not believe we have yet reached 
the truth in regard to the species of this interesting genus. 
We really have not as yet any clear idea as to the limits of 
variation’ in either form, tuberculation or colour, in even a 
single species, and we zoologists who are thousands of miles 
from the restricted home of the genus, are thus working 
largely in the dark in our efforts to identify specimens. 
Some day a zoologist on the ground, or with a careful and 
enthusiastic collector on the ground, will secure sufficient 
material to enable him to work out the actual natural limits 
of each species. Seven specimens. 
Locs.—East coast of Flinders Island, Bass Strait. 
Between Gabo Island, Victoria, and Disaster Bay, New 
South Wales, 50-100 fathoms. 
Off Cape Marsden, Kangaroo Island, South Australia, 17 
fathoms. 
Also two specimens from an unknown locality. 
AMBLYPNEUSTES PACHISTUS, H. L. Clark. 
Amblypneustes pachistus, H. L. Clark, Mem. Mus. Comp. 
Zool. Harvard, xxxiv., 1912, p. 327. 
These individuals range in size from 31 to 45mm. h. d.; 
the height ranges from a little over .80 h.d. in the smallest to 
a little less than .90h.d. in the largest. The colour is the 
same in all: test, pale brown when dry, more nearly olive 
1. Déderlein—Fauna Siidwest-Australiens, iv., 1914, pp. 460-475. 
