10. C. elegans, n. sp. Table 1 figure 2.
Cells elongated ovoid; avicularia large and projecting, without any superior appendage; vittae narrow, rather anterior.
Habitat: Bass Strait, 48 fathoms. Port Dalrymple, on stones at low water.
A delicate and beautiful parasitic species; the branches slender and spreading; colour white and very transparent. Cells regular and uniform in size and shape. A very similar if not identical species occurs in Algoa Bay, South Africa, the only difference between them being that the latter is rather larger and has the vittae much longer; in the Australian forms these bands do not reach above the middle of the cell, whilst in the South African they extend as high as the mouth.
11. C. cornuta, n. sp.
Cells oval; avicularia in many cells wholly transformed into long pointed retrocedent spines, on one or both sides, in others into shorter spines or unaltered. Vittae linear, extremely narrow, entirely lateral, and extending the whole length of the cell from the base of the avicularium.
Habitat: Bass Strait, 45 fathoms.
Colour yellowish white, growth small; parasitic upon C. amphora. As some difficulty might be experienced in the discrimination of this species from C. elegans, and another South African species (not the variety of C. elegans above noticed) it is requisite to remark that the long retrocedent spines when present are not placed upon or superadded to the avicularia, but that they seem to represent an aborted or transformed state of those organs. They vary much in length and size in different cells, and even in those of the same branch; as it frequently happens that there is a spine, usually of diminutive size, on one side and a very large avicularium on the other, and sometimes (but rarely) an avicularium of more moderate size on both sides. But the character of the species by which it is more particularly distinguished consists in the presence on a great many cells, in one part or other of the polyzoary, of the two large and strong spines projecting BACKWARDS. This retrocession of the spines is alone a sufficient character to distinguish the present species from the South African form above alluded to (C. taurina, B.) And the length and lateral position of the vittae would distinguish the unarmed cells from those of C. elegans.
12. C. umbonata, n. sp.
Cells more or less pyriform, alate, narrow below, bulging or ventricose upwards. Avicularia large and strong. Vittae strap-shaped, anterior, extending from the level of the mouth to the bottom of the cell, with elevated acuminate papillae or short spines. A broad compressed projecting process on the middle of the back.