250 Rev. T. Hincks on new 
each zocecium, on a somewhat quadrate area, a small nodule, 
with a pointed aviculariwm on one side of it, the mandible 
directed transversely upwards. Occiwm rounded, smooth, 
umbonate. 
Loc. Houston-Stewart Channel, Queen Charlotte Islands 
(Dr. G. M. Dawson). 
Membranipora echinus, n. sp. 
Zoecia quincuncial, oval, distinct, separated by rather 
deep interspaces, 2 spines at the top and 7-8 slender, 
pointed, and rather tall spines down each side, which slant 
inwards but do not meet in the centre; on each side, spring- 
ing from below the second spine from the top, a pedicellate 
avicularium, the upper part large and much swollen (closely 
resembling a “ bird’s head’”’), very slightly hooked at the ex- 
tremity, apparently jointed to an extremely thin pedicle, 
mandible slender, pointed. Occitwm (?). 
Loc. Houston-Stewart Channel, Queen Charlotte Islands 
(Dr. G. M. Dawson). 
Family Cribrilinide. 
CRIBRILINA, Gray. 
Cribrilina furcata, n. sp. 
Zoecia ovate, quincuncial, very regularly disposed, mode- 
rately convex ; surface smooth and lustrous, often of a reddish- 
brown colour, on each side four to six shallow grooves, 
radiating to a median line, and a central one below, which 
are occupied by a row of roundish pores set very closely 
together, the ridges between them slightly raised, usually 
bearing several elliptical pores ; orifice arched above, straight 
below, much broader than high, on each side a stout bifid 
spine (occasionally simple) ; peristome much thickened in 
front and rising into a central mucro. Avicularia none. 
Oecium large (covering about half the cell above it), rounded, 
taller than broad, depressed in front, with a shallow oral arch ; 
surface smooth, rather thickly punctured. 
Loc. Off Cumshewa Harbour &c., Queen Charlotte 
Islands (Dr. G. IM. Dawson). 
Cribrilina hippocrepis, n. sp. 
Zoecta ovate, quincuncial; surface lustrous, flattish (su- 
tures very shallow), traversed by radiating ridges (three to 
five on each side), which pass from the sides to the centre 
(no median keel), the grooves between them occupied by a 
line of rather large oblong pores; at the origin of each ridge 
an elliptical foramen, covered in by a delicate membrane ; 
