2. Eucecryphalus halicalyptra, n. sp.
Shell flat, campanulate, with distinct collar stricture. Length of the two joints = 1 : 4, breadth = 2 : 10. Cephalis hemispherical, with two divergent conical horns, a major occipital and a minor frontal horn. Thorax with subregular hexagonal meshes and concave-convex lateral outlines, campanulate. From the collar stricture there arise three divergent bristle-shaped spines, nearly horizontal, about half as long as the thorax. Peristome smooth, with a marginal coronal of small square pores.
Dimensions.—Cephalis 0.02 long, 0.04 broad; thorax 0.08 long, 0.2 broad.
Habitat.—Central Pacific, Stations 266 to 274, surface.
Subgenus 2. Eucecryphalium, Haeckel.
Definition.—Peristome or margin of the basal mouth of the thorax dentate, with a coronal of marginal spines.
3. Eucecryphalus cuvieri, n. sp.
Shell flatly conical, with slight collar stricture. Length of the two joints = 1 : 8, breadth = 2 : 10. Cephalis hemispherical, with an oblique pyramidal horn twice as long. Thorax with straight outlines and regular hexagonal meshes, increasing in size towards the mouth. From the collar stricture there arise three stout conical spines, half as long as the thorax, and diverging downwards. Peristome with a ring of small square pores and alternate conical divergent spines. Differs from the similar Clathrocyclas alcmenæ (Pl. [59], fig. 6), mainly in the simple apical horn and the possession of the three collar fundamental spines.
Dimensions.—Cephalis 0.02 long, 0.03 broad; thorax 0.15 long, 0.2 broad.
Habitat.—Tropical Atlantic, Station 342, depth 1445 fathoms.