_Habitat._--Central Pacific, Station 271, depth 2425 fathoms. 3. _Androspyris pithecus_, n. sp. (Pl. 95, fig. 20). Shell smooth, with two slight transverse constrictions. Galea conical, with a short conical horn, longer than the nut-shaped cephalis. Thorax with three nearly vertical and parallel feet of equal length. Pores in the galea and thorax very small and numerous, circular, in the cephalis much larger, irregular, roundish. _Dimensions._--Length of the shell (including horns and feet) 0.25, breadth 0.06 to 0.08. _Habitat._--Central Pacific, Station 272, depth 2600 fathoms. 4. _Androspyris aptenodytes_, n. sp. Shell smooth, with two slight transverse constrictions and irregular, roundish pores. Galea hemispherical, with a short conical horn, about as large as the roundish cephalis and half as large as the ovate thorax. The three feet arise immediately beyond the collar stricture, are equal, divergent, curved, about as long as the cephalis, and are not terminal (as in the three preceding species), but lateral appendages of the thorax. _Dimensions._--Length of the shell 0.2, breadth 0.05 to 0.07. _Habitat._--Antarctic Ocean, Station 157, depth 1950 fathoms. Genus 480. _Lamprospyris_,[98] Haeckel, 1881, Prodromus, p. 447. _Definition._--#Androspyrida# with three free basal feet and a fenestrated apical horn; lattice-work of the three-jointed shell wholly or partly spongy. The genus _Lamprospyris_ differs from the preceding _Androspyris_, its ancestral form, mainly in the higher development of the lattice-work of the large shell. Whilst this in {1094}the latter genus is a simple lattice-plate, it here becomes more or less spongy, and sometimes forms a very dense and delicate wickerwork. The apical horn and the three basal feet are commonly also fenestrated. The two annular strictures, which separate the cephalis from the conical cupola and the inflated thorax, are commonly not so distinct as in the preceding genus. Some species belong to the largest Spyroidea and reach more than half a millimetre in length. 1. _Lamprospyris darwinii_, n. sp. (Pl. 89, fig. 13). Shell nearly pear-shaped, with two distinct annular strictures, and uneven papillate surface. The total length is equal to twice the greatest breadth, and to seven times the length of the ring. Apical horn free, irregularly branched and fenestrated, as long as the included columella beyond it. The three diverging feet are strongly curved, S-shaped, and completely included by loose lattice-work. In the middle of their length they give off a simple strong lateral branch. The loose arachnoidal lattice-work is rather equally developed. _Dimensions._--Length of the entire shell (including the apophyses) 0.5, greatest breadth 0.25, ring 0.07 long. _Habitat._--Central Pacific, Station 271, depth 2425 fathoms. 2. _Lamprospyris lyellii_, n. sp.