Perspinal holes prolonged into short cylindrical tubuli, the length of which about equals their diameter. Both ends of the tubuli with smooth thickened margin. Poruli of the shell simple, without ring and dimple. Four edges of the spines smooth; their length equals about four-fifths of the shell-radius.
Dimensions.—Diameter of the shell 0.24; length of the spines 0.09, of the tubuli 0.01.
Habitat.—North Atlantic, Færöe Channel (Gulf Stream), surface, John Murray.
2. Cannocapsa stethoscopium, n. sp. (Pl. [133], fig. 8).
Perspinal holes prolonged into cylindrical tubuli, half as long as the shell radius. Both ends of the tubuli with smooth thin trumpet-shaped margins. Poruli of the shell simple, without ring and dimple. Four edges of the spines smooth; their length about equals three-fourths of the shell-radius.
Dimensions.—Diameter of the shell 0.2; length of the spines 0.08, of the tubuli 0.05.
Habitat.—South Atlantic (west of Tristan da Cunha), Station 333, surface.
3. Cannocapsa tubulosa, n. sp.
Perspinal holes prolonged into cylindrical tubuli, which are as long as or longer then the shell-radius. Both ends of the tubuli with smooth thickened margin. Poruli of the shell simple, without ring and dimple. Four edges of the spines smooth; their length scarcely equals half the shell-radius.
Dimensions.—Diameter of the shell 0.15; length of the spines 0.03, of the tubuli 0.08.