7. Sethocyrtis agamemnonis, n. sp. (Pl. [62], figs. 11, a, b).
Shell pear-shaped, rough, with sharp collar stricture. Length of the two joints = 2 : 10, breadth = 3 : 8. Cephalis subspherical, with very small pores and a small, pyramidal horn of half the length. Thorax inflate, ovate; in the uppermost part (beyond the collar stricture) with a ring of six to nine very large roundish pores, which are twice to four times as broad as the other irregular, roundish pores. (The shell is seen in fig. 11 from the apical pole, in fig. 11a with the cephalis, in fig. 11b without it, exhibiting the four central collar pores of the cortinar septum.) Mouth truncate, without prominent peristome.
Dimensions.—Cephalis 0.02 long, 0.03 broad; thorax 0.1 long, 0.08 broad.
Habitat.—North Pacific, Station 244, depth 2900 fathoms.
8. Sethocyrtis cassis, Haeckel.
Cornutella cassis, Ehrenberg, 1854, Mikrogeol., Taf. xxii. fig. 38.
Cyrtocalpis cassis, Haeckel, 1862, Monogr. d. Radiol., p. 287.
Shell pear-shaped, smooth, with obliterated collar stricture. Length of the two joints = 4 : 13, breadth = 3 : 12. Cephalis ovate, with a conical horn of half the length. Thorax inflate, ovate, with subregular, circular, quincuncial pores, twice to three times as broad as the bars. Mouth constricted, truncate, two-thirds as broad as the thorax, without prominent peristome.
Dimensions.—Cephalis 0.04 long, 0.03 broad; thorax 0.13 long, 0.12 broad.
Habitat.—Fossil in Tertiary rocks of Sicily (Caltanisetta).