210 
The mouth angles bear at the apex a tuft of small, spine-like 
papillæ, the middle ones being the longest; the outer ones are 
only granules, and these granules continue to the edge of the 
mouth, covering the sides of the mouth angles. The jaws bear a 
bunch of papillæ-like teeth, bordered by some grain-like papillæ; 
the teeth are well separated from the tuft of papillæ on the apex 
of the mouth angles. 
The underside is covered by a thick, finely granulated skin, 
through which no plates can be discerned. The upper side of the 
disk is covered by a more coarsely granulated skin, bearing 
numerous, irregularly arranged, large, round, white tubercles, among 
which one in the centre of the disk and one above the base of 
each arm are the most prominent. At the edge of the interbrachial 
spaces the limit between the coarsely tuberculated upper side and 
the nearly smooth underside is marked quite sharply. The radial 
shields appear as rather broad ribs, continuing about halfway to 
the centre of the disk; at the outer edge they are raised con- 
spicuously over the base of the arms. The radial plates themselves 
are not seen through the thick covering skin. — The genital slits 
are very large, as in Å. propugnatoris. 
The arms are clad on their strongly arched dorsal side by the 
same coarsely granulated covering as the disk, the large tubercles 
continuing, without decreasing conspicuously in size or number, 
until the first forking. From there they diminish both in size and 
number, until beyond the third or fourth forking only one larger 
tubercle is indicated on each arm joint, or, farther out, with more 
irregular intervals. The smaller granules, on the other hand, con- 
tinue still farther out, disappearing only on the outer, fine branches. 
The rings of hooklets may begin between the first and second 
forking, but are not regular till beyond the second forking. The 
underside of the arm, which is almost flat, is covered by a rather 
coarsely, but uniformly granulated skin. — The highly character- 
istic deep tentacular pits are very conspicuous far out on the arms, 
