59 
acle distinet, spiniform, inwards directed. Disk on the under side 
totally naked, except for a few scales, which may be seen at the edge 
of the genital slits at their inner end. First ventral plate small, 
hexagonal. The following vent¬ 
ral plates with truncated inner 
edge and very slightly concave 
outer edge; the sides are near- 
ly straight. In the inner part 
of the arm they are slightly 
longer than broad, farther out 
as broad as long. Two tent- 
acle scales, the abradial slight- 
i 
ly larger than the adradial. 
6 armspines, the lower one a 
little longer than the rest, 
which are about equal to the 
armjoint in length. The four 
middle spines generally have 
an indication of a widening 
at the point. 
Only one specimen, in very 
poor condition, with all the 
arms broken a little distance beyond the disk. — The two figures 
must partly be regarded as restaurations. The specimen was taken 
by J. G ri eg at Jondal, Hardanger, Norway, in 70—100 meters. 
This species is evidently closely related to A. arcystata H. L. 
Clark 1 ) with which it agrees in all main features. On account 
of the great variability of the latter species it is not easy to in- 
dicate quite reliable specific differences between the two species, 
especially since only one specimen is available of the new species. 
But a careful comparison between this specimen and the figures 
of arcystata given by Clark appears to me to leave no doubt 
that they are specifically different. Moreover, I have sent the fig¬ 
ures of my specimen to H. L. Clark, who after having compared 
them with his youngest specimen of arcystata (6 mm) declares 
that they are really different; A. Griegi has a coarser scaling, 
') H. Lyman Clark. North Pacific Ophiurans in the collection of the 
United States National Museum. Buli. U. S. Nat. Museum. 75. 1911. p. 145. 
Fig. 4. Amphiura Griegi. 
a. ventral side ; b. dorsal side ; c. part of 
arm, dorsal view ; d. armspines. u /i. 
