Dimensions.—Length of the two principal spines 0.4 to 0.5, of the ten smaller spines 0.2 to 0.3, of the eight rudimentary polar spines 0.01 to 0.06; breadth of the two large spines 0.02 to 0.03.
Habitat.—Central Pacific, Stations 266 to 274, surface.
2. Acantholonche peripolaris, n. sp. (Pl. [132], fig. 8).
Two principal spines quadrangular prismatic, with four broad prominent lamellar wings, of increasing breadth towards the pyramidal distal apex. Both ends of each spine four-sided pyramidal, base without leaf-cross. Two transverse and eight tropical spines about two-thirds as long as the former, four-sided pyramidal in the basal half, conical in the distal half, often curved. Eight polar spines very small, about one-fourth as long as the latter, short conical or pyramidal. Central capsule four-sided prismatic, enveloping both principal spines.
Dimensions.—Length of the two principal spines 0.2, of the ten smaller spines 0.12, of the eight rudimentary polar spines 0.04.
Habitat.—Central Pacific, Station 274, surface.
Order IV. ACANTHOPHRACTA, Richard Hertwig, 1879.
Acanthometræ cataphractæ, Johannes Müller, 1858, Abhandl. d. k.
Akad. d. Wiss. Berlin, pp. 12, 22, 49.