Polyzoa of Queen Charlotte Islands. 465 
bergen, Greenland, Nova Zembla, Labrador, Britain (north- 
east. | 
Membranipora Rosselit, Audouin. 
Houston Stewart Channel, on shells, not uncommon. 
[Britain, Algiers, Adriatic. ] 
Membranipora tenutrostris, Hincks. 
Off Cumshewa Harbour; Houston Stewart Channel. 
[Mediterranean ; Madeira. | 
Membranipora horrida, Hincks. 
Houston Stewart Channel, 8-10 fms.; off Cumshewa Har- 
bour. Abundant and very fine, forming very large, reddish- 
brown patches on shells. [California; Vancouver Island.] 
Membranipora patula, Hincks. 
Virago Sound; Houston Stewart Channel, &c., very com- 
mon and of luxuriant growth. ([California.] . 
The ocecium was not observed on Californian specimens, 
but is present in profusion on those from the Queen Charlotte 
Islands. It is shallow, cucullate, smooth, and closed in front 
by achitinous operculum. ‘The species forms brown or red- 
dish-brown patches. 
Membranipora vartegata, Hincks. 
Dolomite Narrows, in about 8 fms., very plentiful ; spreading 
in large patches over the surface of shells. [California.] 
Specimens occur in which there are two of the pedicellate 
avicularia at opposite sides of the ceil, instead of the normal 
one. The spines are without the dark-coloured base, which is 
a conspicuous feature in the Californian form. 
Membranipora acifera, MacGillivray, form multispinata. 
(PI. XIX. fig. 4.) 
The form from the Queen Charlotte Islands which I refer 
to MacGillivray’s species differs in some respects from his 
description ; but the two agree so perfectly in the most striking 
and important characters that there is hardly room for doubt 
as to their identity. He describes his M. acifera as having 
“one or two sharp incurved spines on each side, and usually 
a small round spine in each upper angle.” In the North 
Pacific specimens, which are finely developed, there are two 
erect and pointed spines at the top of the cell, and along each 
Ann. & Mag. N. Hist. Ser. 5. Vol. x. 31 
