Polyzoa from Queen Charlotte Islands. 249 
front, with a broad triangular mandible, which is bent abruptly 
in the middle, scattered amongst the zocecia. Omcium very 
shallow, just covering the extremity of the cell, smooth, with 
a raised rib across it a little above the oral margin. 
Zoartum of a deep black colour, forming a large irregu- 
larly spreading crust. 
Loc. Houston-Stewart Channel, Queen Charlotte Islands 
(Dr. G. M. Dawson). 
Membranipora exilis, n. sp. 
Zoecia oblong, quincuncial, subtruncate above and below, 
set closely together, of considerable size and delicate material, 
margin thin, a good deal raised, the front wall wholly mem- 
branous; atthe top of the cell 2 spines, and 3 or 4 on 
each side (or sometimes a smaller number), situated on the 
upper half of the cell, slender, pointed, suberect, jointed to a 
tubular base; a sessile avicularivm on the margin at one 
side (often absent), just below the top, beak sloping upwards, 
scarcely bent at the extremity, mandible blunt, directed - ob- 
liquely outwards. Ovcia (?). 
Loc. Houston-Stewart Channel, Queen Charlotte Islands, 
enveloping Cellaria borealis, Busk, with a very thin crust 
(Dr. G. M. Dawson). 
Membranipora conferta, n. sp. 
Zoecia oval, quincuncial, set closely together, front wall 
wholly membranous, margin thin, smooth ; on each side about 
4 sharply pointed spines, and (often) a central one below, 
which bend rather abruptly over the area and meet in the 
middle; an avicularium at each side on the margin, just 
below the upper end, slightly raised, pointed, the mandible 
directed upwards, a small erect spine below the avicularia; 
at the bottom of the cell a single pointed avicularium with 
triangular mandible, variously turned. O@ciwm rounded, 
smooth, with a variously shaped depressed area (or fossa) in 
front, composed of thinner material than the rest of the sur- 
face, and appearing dark-coloured as compared with the sur- 
rounding dense white crust. 
Loc. Houston-Stewart Channel, Queen Charlotte Islands 
(Dr. G. M. Dawson). 
Membranipora levata, n. sp. 
Zoecia small, oval, distinct, quincuncial, margin very 
slightly raised, thin, smooth, the whole front closed in by a 
smooth, light-coloured, and rather glossy membrane, which 
lies very much on a level with the edge of the cell; above 
Ann. & Mag. N. Hist. Ser. 5. Vol. x. 107 
