4.  C. ventricosa, n. sp.  Table 1 figure 1.

Cells oval, compressed, rather wide below; avicularia wide, supporting sometimes a cup-like cavity, sometimes a closed broad conical spine.  The prehensile part of the avicularium itself small, seated in a deep notch below the acuminate summit; lateral area large and well defined.  Fenestrae 7, with fissures radiating to a rounded central opening.  Anterior surface of cell studded with minute acuminate papillae; posterior surface smooth, sometimes spotted.

Habitat:  Bass Strait, 45 fathoms.

Colour dirty white or brown.  Habit stiff, stem strong, straight, branches short and crowded—­probably attains a height of four or five inches.  The only other species with which it can be confounded is C. amphora, from which it differs in the greater size and more irregular form of the lateral processes, in the presence of the minute papillae on the surface, and in the absence of the narrow longitudinal band on the back; instead of which the older cells in C. ventricosa exhibit a sort of broad scutum, almost covering the back of the cell and sending off two lateral bands on the sides of the cell, one passing below the avicularium and above the lateral area, and the other towards the acuminated apex of the avicularium.  It also wants the raised bands which in C. amphora pass from the sides of the mouth to the apex of the avicularium in front.  One large specimen presents a variety worthy of note—­in this the backs of all the cells, except one here and there, exhibit (internally ?) numerous irregular-sized leopard-like spots.

5.  C. plagiostoma, n. sp.

Cells short-ovoid; avicularia very large and long, ascending from near the bottom of the cell into an acute spinous point, and supporting a deep cupped cavity; mouth placed obliquely; front of cell divided into five large subtriangular fenestrae by four broad bands.  Back of cell with a broad central band and two narrower bands branching from it on each side; surface of spaces left uncovered by the bands on the back beset with scattered, long setose spines.

Habitat:  Bass Strait, 45 fathoms.

Colour brownish white; habit stiff, branches short.  This species is at once recognisable by the peculiar oblique position of the mouth—­the enormously developed avicularium usually only on one side of the cell, and by the sculpture of the cell—­which appears as if it were swathed with broad tapes or bands.  The wide spaces left between the bands in front clearly represent the true nature of the fenestrae of other species.  It is the only species furnished with elongated setose spines.

6.  C. lorica, n. sp.

Cellaria catenulata ?  Lamarck.

Cells elongated rhomboidal, truncated at each end.  Fenestrae three, large, the lowest the largest, arranged in a triangle.  Mouth very large; avicularia wide and strong; two lateral areae on each side, well developed; surface in front with a few indistinct circular spots around the fenestrae, and behind marked with faint longitudinal striae.