105 
Bell States that there is only a single specimen of this species. 
In faet there are 9 specimens, ranging in size from 10 to 14 mm 
diameter of disk. One specimen has the arms well extended; they 
reach a length of ca. 60 mm; as the point is broken the true 
length is somewhat greater, probably some 80 mm total. 
To the very deficient description not accompanied by figures, 
given by Bell, I shall add the following remarks, also supplying 
the necessary figures. 
The tubercles, which cover the disk completely, leaving no dis¬ 
tinet traces of the radial shields, are rounded, perfeetly smooth, 
smaller in the middle of the disk, inereasing in size towards the 
base of the arms; rarely they continue a little way out on the 
dorsal surface of the arms. The interradial spaces on the oral side 
generally carry a few similar, but somewhat smaller tubercles; other- 
wise they are covered with fine grains. Also the underside of the 
arms and the oral frame are covered by rounded grains, generally 
slightly larger than those of the interradial spaces. Along the edge 
of the mouthframe there is mostly a series of larger tubercles, 
forming something like a fence, separating the slightly sunken inter¬ 
radial Space from the mouth frame. This transverse series of tub¬ 
ercles has mueh the appearance of being a continuation of the series 
of armspines. The genital slits are fairly large, some 2 mm long. 
The mouth edges carry each a cluster of spines or papillæ, which 
outwards gradually pass into the common granulation of Ihe under¬ 
side. This is perhaps what is meant by the statement of Bell 
that „the papillæ are encircled by well-marked granules which be- 
come spiniform towards the periphery“, a statement which does 
not appear very intelligible. The covering of the dorsal side of the 
arms is that typical of Åstrotoma s. str.; it may only be pointed 
out that the double rings of hooks are complete from the base of 
the arm, at most the 1—3 proximal rings being interrupted in the 
dorsal midline. There are generally three short, thick, smooth arm¬ 
spines,' slightly rough at the point. Now and then there may be 
only two spines on some consecutive joints. Towards the end of 
the arm .the spines gradually assume the character of hooks. 
This species appears to be most nearly related to A. Murrayi 
Lym. — No specimens are known besides those taken by the 
”Terra Nova“. 
