5. Euchitonia lanceolata, n. sp. (Pl. [43], fig. 9).
Distance between the paired arms about one and a third times as large as their distance from the odd arm. All three arms nearly of the same size and form, three times as long as broad, lanceolate, much broader in the middle part than at both ends; distal end cuspidate, but not spiny. Patagium incomplete, with convex chamber-rows, envelops about two-thirds of the arms.
Dimensions.—Radius of all three arms 0.18, greatest breadth (in the width) 0.06.
Habitat.—North Atlantic, Station 353, depth 2965 fathoms.
6. Euchitonia zittelii, Haeckel.
Stylactis zittelii, Stöhr, 1880, Palæontogr., vol. xxvi. p. 112, Taf. v. fig. 8.
Distance between the paired arms about one-fifth as large as their distance from the odd arm. All three arms nearly of the same size and form, in the proximal half thinner and nearly square, in the distal half thicker and circular; the latter half twice to three times as broad as the former. Patagium incomplete, with convex chamber-rows, envelops only the proximal square half of the arms.
Dimensions.—Radius of all three arms 0.15, basal breadth 0.03, terminal breadth 0.08.
Habitat.—Fossil in Tertiary rocks of Sicily, Grotte, Stöhr.
7. Euchitonia stöhrii, n. sp. (Pl. [43], fig. 12).