Shell slender, pear-shaped, very similar to the preceding species, but differing in the following characters--the branched horn is much larger and twice as long as the columella; the two annular transverse strictures (separating the three joints) are deeper. The free internal branches of the three included feet are forked. Lattice-work looser than in the preceding species. _Dimensions._--Length of the entire shell 0.6, breadth 0.2, ring 0.09 long. _Habitat._--Central Pacific, Station 266, depth 2750 fathoms. 3. _Lamprospyris huxleyi_, n. sp. (Pl. 89, fig. 14). Shell ovate, spiny, with two slight annular transverse strictures; their length equal to one and a half times the breadth, and up to seven times the length of the ring. Apical horn quite included by the loose lattice-work of the large conical cupola, which is as long as the cephalis and thorax together. The three slender feet are also included in the lattice-work and only one-third as long as the shell, nearly vertical. Lattice-work much denser than in the two preceding species. _Dimensions._--Length of the shell 0.4, breadth 0.26, ring 0.06 long. _Habitat._--Central Pacific, Station 274, depth 2750 fathoms. 4. _Lamprospyris hookeri_, n. sp. Shell ovato-conical, very similar to the preceding species, but smooth, not spiny. The apical horn and the three feet are much longer, not included in the network, but freely prominent, half {1095}as long as the shell and nearly vertical, parallel. The arachnoidal lattice-work is much denser in the middle third (cephalis) than in the upper third (cupola) of the lower third (thorax). _Dimensions._--Length of the shell (without appendages) 0.45, breadth 0.3, ring 0.08 long. _Habitat._--Central Pacific, Station 270, depth 2925 fathoms. 5. _Lamprospyris spenceri_, n. sp. Shell slender, ovate, very similar to the preceding species; differing from it in the larger cupola, which is as long as the cephalis and thorax together. The three feet are much shorter and weaker, more divergent. This differs from all four preceding species in the possession of a large double apical horn; the two horns are strong, pyramidal, straight, strongly divergent, and as long as the cupola. _Dimensions._--Length of the shell (without the appendages) 0.3, breadth 0.2, ring 0.05 long. _Habitat._--Central Pacific, Station 272, depth 2600 fathoms. Subfamily 2. PERISPYRIDA, Haeckel, 1881, Prodromus, p. 443. _Definition._--#Androspyrida# without free basal feet, with three distinct joints separated by two parallel transverse strictures. Genus 481. _Amphispyris_,[99] Haeckel, 1881, Prodromus, p. 444. _Definition._--#Androspyrida# without free basal feet, with three distinct joints, separated by two transverse strictures; lattice-work of the shell only complete in the frontal ring, with large open holes on the ventral and dorsal face.