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"An Actaea nearly akin to A. flosculata, but with the following differences from that species:
Only the spines on the back have the characteristic petaloid shape. Those at the sides and on the limbs are sharp thorns. The posterolateral edge of the back is not marked by a row of small beads, as in A. flosculata and in A. perspinosa. The hinder edge has a thickened rim, which is wanting in the above-mentioned two species, and the whole arrangement of the tubercles on the field behind the post-gastric furrow is different, as will be seen by comparing the figures. The peculiar tubercles on the outside of the hand of A. fosculata are replaced in A. spinosissima by sharp thorns, and the teeth on the apposed edges of the fingers are less stout. Color in spirit: pure white. Dredged in Mahlos Atoll, in 23 fathoms."
(L.A. Borrodaile, 1902, pg. 256-257)