Shell subspherical, smooth, with a short, oblique, conical, apical horn. The larger odd foot cylindrical, nearly straight, as long as the shell, with a few short lateral branches, at the distal end forked. The three smaller feet were in one specimen observed forked, in another (the specimen figured) replaced by nine small thorns.
Dimensions.—Length of the shell 0.11, breadth 0.13.
Habitat.—South Atlantic, Station 332, depth 2200 fathoms.
Genus 702. Gazelletta,[[319]] John Murray, 1876 (in litteris).
Definition.—Medusettida with six articulate feet on the peristome.
The genus Gazelletta is by far the most common of all Medusettida, and some species seem to be widely distributed, or even cosmopolitan. The number of species, too, is in this genus much larger than in all the other genera of this family. It differs from the latter in the possession of six feet, which number is very constant in the majority of species; in some species, however, single specimens are not rarely found which possess five or seven feet instead of six. Usually the six feet are rather regularly formed and disposed, and diverge downwards; but sometimes there is more or less irregularity in their shape and arrangement. In the majority of species the feet are very long, curved, and armed in a very various manner, so that four subgenera may be distinguished, according to the armatures.
Subgenus 1. Gazellarium, Haeckel.
Definition.—Feet simple, smooth, without spines and without terminal branches.
1. Gazelletta hexanema, n. sp. (Pl. [120], fig. 5).
Shell hemispherical, smooth. Feet very long, cylindrical, straight, smooth, widely divergent, without terminal branches.