107 
not seem to be an insuperable number to count, and they are 
short, thick, flattened, ending in 2—4 distinet points, which could 
not easily be gathered from the description quoted, — Otherwise, 
I would refer to the description given by Clark of his A. au- 
straliensis, which — apart from the differences pointed out above — 
suits A. Wilsoni as well. 
No other specimens known than those taken by the “Terra 
Nova“, East of North Cape, 70 fathoms. Besides the two spec¬ 
imens on which BelTs description was based, there is also a young 
specimen, 4 mm diameter of disk, lying together with the spec¬ 
imens of Ophiothrix aristulata, as mentioned by Bell under his 
Ophiothrix sp. Its arms are so strongly coiled up that it is impos- 
sible to measure their length. The specimen shows the interesting 
feature of the 6 primary disk plates being distinet; they are, how- 
ever, very small, and only through their darker colour to be dis- 
tinguished from the grains. There is no trace of the radial shields. 
There are only two of the grain-covered transverse bars on the 
disk at the base of each arm, while in the grown specimens there 
are 4—5 of these bars on the disk. The genital slits have ap- 
peared, but are situated off the first armjoint (armspines), while in 
the adult specimens they lie between the third and fourth joint. A very 
considerable displacement must accordingly take place during growth. 
6. Astroceras elegans (Bell). 
PI. VI. Fig. 3. 
Astroschema elegans. F. Jeffr. Bell. 1917. British Antarctic(“TerraNova“) 
Exped. Echinoderma. Zoology. IV.i. p. 7. 
To the rather deficient description of this species given by Bell 
I may add the following remarks. 
With “the five pairs of rows of prominent plates, which might 
at a superficial view be taken for radial shields“ are evidently 
meant the white tubercles, which cover the radial shields; they are 
generally arranged in a very distinet series along each radial shield 
in the younger specimens, while in the larger specimens the ar¬ 
rangement becomes more irregular. Also the number of these tub¬ 
ercles is rather variable. The white tubercles continue a various 
distance on the arms, sometimes only on a few of the inner joints, 
sometimes forming regular rings nearly to the end of the arm. In 
