470 On the Polyzoa of Queen Charlotte Islands. 
Family Microporide. 
Micropora, Gray. 
Micropora coriacea, Esper, var. 
The form in which the marginal nodules are wanting is 
extremely abundant amongst the dredgings. It is, indeed, 
one of the commonest species, covering many of the shells with 
its flat glossy crust, and seldom altogether absent from any. 
Bass’s Straits, Australia, var.: Britain, Florida, with the 
? ? ? b] ] 
nodules. | 
Family Cribrilinide. 
CRIBRILINA, Gray. 
Cribrilina furcata,n. sp. (Pl. XX. fig. 5.) 
Zowcia ovate, quincuncial, very regularly disposed, mode- 
rately convex; surface smooth and lustrous, often of a reddish 
brown colour ; on each side from 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. Occium large (covering 
about half the cell above it), rounded, taller than broad, de- 
pressed in front, with a shallow oral arch; surface smooth, 
rather thickly punctured, the forked spines showing in front 
of it. 
Loc. Cumshewa; Houston Stewart Channel ; common. 
The furcate spine is often wanting, especially in the older 
cells. 
Cribrilina hippocrepis,n. sp. (Pl. XX. figs. 6, 6 a.) 
Zoecia ovate, quincuncial ; surface lustrous, flattish (sutures 
very shallow), traversed by radiating ridges (from 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 adelicate membrane; orifice 
large, well arched above, constricted a little above the lower 
margin, which is straight ; operculum of a rich reddish brown; 
peristome not elevated, lower margin much thickened, usually 
terminating on each sidein a knob; large, elongate, depressed 
spatulate avicularia scattered amongst the cells. Ometwm (?). 
