Polyzoa of Queen Charlotte Islands. 467 
wholly membranous ; margin thin, smooth, on each side from 
four to six sharply pointed spines, 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 
at the base of each avicularium; at the bottom of the cell a 
single aviculartum, with an elongate triangular mandible, 
variously turned (sometimes two). Occiwm rounded, smooth, 
with a rib arching across the front, frequently carried up into 
a peak. 
Loc. Houston Stewart Channel. [Assistance Bay; Spitz- 
bergen. | 
Described as WM. conferta (‘ Annals’ for September 1882). 
I am new convinced that it is a form of M. Sophie. Smitt 
notices intermediate varieties. 
Membranipora nigrans,n. sp. (Pl. XIX. figs. 2, 2 a.) 
Zoecia large, ovate (variable in shape, sometimes arched 
above and narrowing downwards, sometimes broad-ovate, 
sometimes oval), irregularly disposed; margins much ele- 
vated, crenate, the whole front of the cell covered by a rather 
coarse stout membrane of a black colour; oral valve large; 
on each side at the top a pointed avicularium, placed on the 
margin, depressed at the base, the beak sloping upwards, 
mandible directed obliquely downwards ; very large avicularia, 
slightly raised in front, with a broad triangular mandible, 
which is bent abruptly in the middle, scattered amongst the 
zocecia. Ocectum very shallow, just covering the extremity 
of the cell, smooth, with a raised rib across it a little above 
the oral margin. Zoariuwm of a deep black colour, forming 
large irregularly spreading crusts. 
Loc. Houston Stewart Channel; Virago Sound. 
A fine characteristic species, distinguished by its dark colour 
and its remarkably large zocecia. 
Membranipora levata, n. sp. (Pl. XIX. figs. 6, 6 a.) 
Zoecia small, oval, distinct, quincuncial; margin very 
slightly raised, thin, delicately crenate, 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 each zocecium, on a somewhat quadrate area, a small 
nodule with a pointed aviculartum on one side of it, the 
mandible directed transversely upward. Occiwm rounded, 
smooth, umbonate. 
Loc. Houston Stewart Channel, 15-20 fms; Cumshewa ; 
very abundant. : 
31* 
