Two principal spines cylindrical, of equal breadth throughout their whole length, with simple conical apex; base a small pyramid, without leaf-cross. Eighteen smaller spines conical, much shorter, with simple bristle-shaped apex. Central capsule spindle-shaped or cylindrical, yellow.
Dimensions.—Length of the two major spines 0.4 to 0.8, of the eighteen minor 0.05 to 0.2.
Habitat.—Cosmopolitan; Mediterranean, Atlantic, Pacific, surface.
2. Amphilonche lanceolata, n. sp. (Pl. [132], fig. 1).
Two principal spines compressed, lanceolate, two-edged, gradually tapering from the broader middle towards the two ends; apex simple; base a large pyramid, with broad leaf-cross. Eighteen smaller spines about half as long, pyramidal, with simple conical or bristle-shaped apex. Central capsule lentelliptical, pink, opaque.
Dimensions.—Length of the two major spines 0.2, of the eighteen minor 0.1.
Habitat.—Tropical Atlantic, Station 343, surface.
3. Amphilonche diodon, n. sp. (Pl. [132], fig. 3).
Two principal spines compressed, lanceolate, two-edged, tapering from the broader middle towards the two ends; apex simple; base a small pyramid, without leaf-cross. Eighteen smaller spines sword-shaped, only two-thirds or one-half as long, and one-third or one-fourth as broad, each with two opposite teeth in the distal part. Central capsule ellipsoidal.
Dimensions.—Length of the two major spines 0.13, breadth 0.02; length of the eighteen minor spines 0.1.