Dimensions.—Diameter of the shell 0.3 to 0.33, teeth 0.12, pharynx 0.06.
Habitat.—South Atlantic, Stations 328 to 334, surface.
Genus 698. Porcupinia,[[315]] Haeckel, 1879, Sitzungsb. med.-nat. Gesellsch. Jena, Dec. 12, p. 5.
Definition.—Challengerida with a pharynx, with teeth on the mouth and marginal spines.
The genus Porcupinia differs from the preceding Pharyngella in the development of marginal spines, and exhibits therefore the same relation to it that Challengeron bears to Challengeria. Only two species have been observed; the first of these bears, besides the large marginal spines, numerous flinty bristles on the surface of the shell.
1. Porcupinia aculeata, n. sp.
Shell ovate, one and one-third times as long as broad, slightly compressed, covered with short, bristle-shaped spines over the whole surface, similar to Entocannula hirsuta (Pl. [99], fig. 20). The keeled margin is armed with numerous long and stout radial spines, which are alternately larger and smaller, as in Challengeron moseleyi (Pl. [99], fig. 14); the larger about as long as the radius, the smaller half as long. Peristome with two straight, parallel teeth. Pharynx funnel-shaped, half as long as the radius, its outer aperture twice as broad as the inner.
Dimensions.—Length of the shell 0.24, breadth 0.18; peristome 0.05.
Habitat.—Tropical Atlantic, Station 347, depth 2250 fathoms.
2. Porcupinia cordiformis, n. sp. (Pl. [99], fig. 16).