Puhjzoa of the S(. Lawrence. l.l.'J 



previously ranked it as a form of Microporella ciUata {^^ forma 

 chtra^^)*. His figure of Discopora cruenta is a very good 

 representation of the ])re.sent species. 



A peculiarity of the ooeciuni must not be omitted ; the 

 tliick granular collar which incloses the orifice of the cell is 

 carried up on each side, covering the lower part of theoccciuni 

 and concealing its oral arch. This is shown, though only 

 partially, in the figure acconij)anying my last paper (' Annals,' 

 ser. (), vol. iii. pi. xxi. fig. '6). 



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. 



SchizoporeUa cruenta, Norman (sp.). (PI. VIII. fig. 5.) 

 Lejyralia violacea, var. cruenta, Bust, B. M. Cat. pi. ex. fit>-. 1. 



The figure of this species, taken from a St. -Lawrence 

 specimen (PI. Ylll. 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 zooecia; but in addition to these one is 

 sometimes placed near the bottom of the cell, Avhilst 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 

 zooecia 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, ou 

 the ground that " the orifice of the young cells is slightly 



* "Kritisk Forteckn. &c.,' (Efver^ig-t af Konj;-!. Vet.-Akad, Forhaudl 

 1867, Bihaug, p. 61, pi. x.xiv. lig. 17. 



