273 
plates are covered with very small, siender spinelets, those close 
to the primary series of spines being sligthly enlarged, flattened 
and pointed. — The terminal plate is seen in the small specimen 
to be covered with the same sort of grains as those of the supero- 
Fig. 2. Astropecteii primigenius. a. Inferomarginal; 
b. mouthplates; c. adambulacral plate. All 
Fig. 3. Astropecten 
primigenius. Paxillæ. ^i/i. 
marginal plates and to carry at the point two short blunt spines 
on each side. 
Adambulacral plates (Fig. 2.c) with three fairly robust furrow 
spines, the middle one slightly longer than the lateral ones. Outside 
these is a series of 3—4 subambulacral spines, of about ecjual size, 
and at the abradial edge of the plate there are 4—5 spines, not 
forming a regular series. — The mouth plates (Fig. 2.b) carry on 
the inner half each two fairly regular series of rather robust spines, 
while on the outer half the spines are more siender and less 
distinctly arranged in longitudinal series. On the adoral edge there 
are two fairly strong, but not much enlarged spines. 
The intermediate plates are numerous; the proximal series 
continues to the outer third of the arms, one corresponding to 
each adambulacral plate. There are in all 4 series of intermediate 
plates; the second series ends off the interspace between the 
second and third inferomarginal, while the third and fourth series 
are confined to the interradial space. All the intermediate plates 
Vidensk. Medd. fra Dansk naturli. Foren. Bd. 79. 
18 
