Polyzoa of the St. Lawrence. 153 
previously ranked it as a form of Microporella ciliata (‘ forma 
dura”) *, His figure of Discopora cruenta is a very good 
representation of the present species. 
A peculiarity of the ocecium must not be omitted; the 
thick granular collar which incloses the orifice of the cell is 
carried up on each side, covering the lower part of the ocecium 
and concealing, its oral arch. This is shown, though only 
partially, in the figure accompanying my last paper (¢ Annals,’ 
ser. 6, vol. iti. pl. xxi. fig. 3). 
The surface of the cells as calcification proceeds becomes 
granular and glistening; but in earlier stages it is thickly 
covered with minute pores, a line of somewhat larger size 
running round the margin, 
Schizoporella eruenta, Norman (sp.). (PI. VIII. fig. 5.) 
Lepralia vielacea, var. cruenta, Busk, B, M. Cat. pl. ex. fig. 1. 
The figure of this species, taken from a St.-Lawrence 
s specimen (Pl. VIII. fig. 5), shows a much more rugged con- 
dition of the surface than I have met with before. Even 
Busk’s excellent figure, in which the two large nodules below 
the orifice are represented, gives no adequate idea of the 
extent to which these elevations of the surface may be deve- 
loped. The suboral nodules seem to be almost always 
present on adult zocecia; but in addition to these one is 
sometimes placed near the bottom of the cell, whilst the 
thickened upper margin of the peristome, which in its simplest 
condition is carried up into a central peak, is commonly 
broken up into two or more of the nodular prominences. At 
the same time the whole surface is furrowed and ridged and 
granulated. 
The margin of the cell is occupied by a line of very large 
pores and a number are scattered over the front wall. The 
zocecia near the margin of the colony are comparatively 
smooth and flattish and the nodules upon them merely rudi- 
mentary. 
The figure of S. cruenta in my ‘ Hist. Brit. Mar. Polyzoa’ 
was taken from a specimen in which calcification was not 
redundant, and does not present what must probably be con- 
sidered the more usual aspect of the species. 
A question may be raised as to the systematic position of 
this form. I have placed it in the genus Schizoporella, on 
the ground that “the orifice of the young cells is slightly 
* “Kritisk Forteckn. &c., Oifversigt af Kongl. Vet.-Akad, Forhandl 
1867, Bihang, p. 61, pl. xxiv. fig. 17. 
