Dimensions.—Length of the shell 4.2, breadth 3.1.
Habitat.—North Pacific, Station 259, depth 2225 fathoms.
4. Cœlographis gracillima, Haeckel.
Cœlodendrum gracillimum (partim) Haeckel, 1862, Monogr. d. Radiol., Taf. xxxii. figs. 2, 3.
Shell-mantle one and a third times as long as broad, similar to the three preceding species, its frontal perimeter isosceles triangular. Nasal odd style one and a half times as long as the two paired tergal styles, the former with eleven or twelve, the latter with seven or eight pairs of branches. Terminal coronets irregularly dichotomously branched, with twelve to sixteen spinulate fingers. The network of the mantle is also spinulate (loc. cit., fig. 3). This species was formerly confounded by me with Cœlodendrum gracillimum (loc. cit., fig. 1), since I found a fragment only of the former entangled in the branch-work of the latter (1859, in Messina). Afterwards (in 1877) I observed a complete specimen in Corfu.
Dimensions.—Length of the shell 3.2, breadth 2.4.
Habitat.—Mediterranean (Messina, Corfu), surface.
5. Cœlographis triangulum, n. sp.
Shell-mantle about as long as broad, its frontal perimeter equilateral triangular, without basal excision, with three equal straight sides. Nasal odd style and the two paired pectoral styles nearly of equal length, each with ten to twelve alternate-cruciate pairs of lateral branches. Terminal coronets umbrella-shaped, composed of eight equal, simply forked branches.
Dimensions.—Length of the shell 3.6, breadth 3.4.