Class—Polyzoa. 
Alimentary canal suspended in a double walled sac, capable of being 
partially protruded ; mouth surrounded by a circle of hollow ciliated 
tentacles ; animals always composite. 
ORDER—PHYLACTOLAMATA. 
Lophophore bi-lateral ; mouth with an epistome. 
Sub-Order—Lophophea. 
Arms of lophophore free or obsolete. (Fresh water.) 
FAMILY—PLUMATELLID/:. 
Zoarium rooted. 
Genus, PLUMATELLA.—Bosc. 
Zoarium confervoid, branched, composed of a series of membrano- 
corneous tubular cells, each of which constitutes a short ramulus with a 
terminal orifice ; branches distinct from one another. Lophophore 
crescentric, with two long arms. 
P. aplinii, MWacgiliivray, Trans. Royal Soc. Vic. 1860, p. 204. 
Zoarium adherent, creeping; cells cylindrical, with a distinct keel ; 
aperture oblique. 
Homebush Creek, Malvern Hills, under stones. Australia. 
I have only examined dried specimens, but Macgillivray says that 
the tentacula are about sixty, and the statoblasts elongated. It ap- 
proaches very near to P. emarginata of Europe. 
ORDER—GYMNOLAMATA. 
Lophophore orbicular, or nearly so ; no epistome. Marine. 
Sub-Order— Cheilostomata. 
Polypide completely retractile; evagination of tentacular sheath 
perfect ; orifice of cell sub-terminal, of less diamater than the cell, and 
usually closed with a moveable lip or shutter; sometimes by a con- 
tractile sphincter; cells not tubular ; consistence calcareous, corneous, 
or fleshy. 
