366 Rey. T. Hincks’s Contributions towards a 
Similar diversities in the mode of growth are of frequent 
occurrence within the limits of a species amongst the Cheilo- 
stomata, and in the Ctenostomatous group Alcyonidium hir- 
sutum is found as a gelatinous crust and as an erect palmate 
expansion with many lobate branches. In the present case 
the zoarium seems to be firmer and less fleshy than in the 
crustaceous condition, and is of a rather dark horn-colouy. 
The branching is irregular; in the largest specimen I have 
seen the stem divides dichotomously near the base, the secon- 
dary shoots dividing into tall flexuous branches, which bear 
numerous short branchlets. The branches are slightly 
attenuated and smooth at the base. There is always much 
variability in the number of the spines, and in English speci- 
mens they are often very much confined to the oral region, but 
they are also found surrounding the cell. In the Australian 
variety they are few in number and small above the orifice, 
but form a regular line round the margin of the cell, and bend 
in over the front of it. 
Flustrella dichotoma, v. Suhr (sp.). 
(PI. XIV. figs. 2 a, 2d.) 
Verrucularia dichotoma, vy. Suhr, Ratisbon Flora (1854), p. 725, tab. i. 
fig. 9, a, a. 
Puinceinaree dichotoma, Busk, Quart. Journ. Microscop. Sc., ‘ Zoo- 
phytology.” 
Zoartum erect, much branched di- and trichotomously, 
the terminal branchlets generally trifid; stem and branches 
slender, cylindrical, composed of a transparent membranous 
material; attainsa height of about 2 inches. Zowcia arranged 
in six series, those of neighbouring series alternating, very 
regularly ovate, bounded by a strongly marked dark line, 
very convex ; surface smooth, destitute of spines, prolonged 
below into a kind of peduncle ; orifice placed a little way 
below the top of the cell, bilabiate, with a dark chitinous 
border. Between the rows of cells a narrow smooth inter- 
space divided at intervals by transverse dark lines (? septa). 
Loc. Port Phillip, Australia (Kirchenpauer); Port Phillip 
Heads (J. B. Wilson). 
This form, originally described by v. Suhr as a Pucus, was 
referred by Busk to his family Farciminariide, and placed in 
the genus Farciminaria. Owing probably to the dried con- 
dition of his specimens the latter writer has overlooked the 
Ctenostomatous structure of the ovifice, which agrees in all 
respects with that of Flustrella. In the characters of the 
zocecium and the general habit this species approaches the 
