Zoology.-] NATURAL HISTORY OF VICTORIA. \Polyzoa. 



Plate 58, Fig. 4. 



MENIPEA CERVICORNIS (P. MacGil.). 



Description. — A pair of cells in an internode, with three at a bifurcation ; 

 connecting- tubes double ; aperture oblique, partly filled in by a faintly g-ranular 

 calcareous plate ; 4 to 6 hollow spines, of which several are generally larger and 

 pod-like, articulated to the outer margin. Opercular spine springing from the 

 inner and lower part of the aperture, enlarged and branched at the extremity. 

 Avicularia large, opening nearly opposite the lower edge of the aperture. 



Reference. — Emma cervicornis, P. H. MacGillivray, Trans. Roy. Soc. Vict., 



Queeuscliff. 



The branched opercular spine, springing from the inner and 

 lower part of the aperture, readily distinguishes this from the 

 other two- celled species. In addition to the branches of bifur- 

 cation others frequently rise from the front of a cell, usually the 

 lower in an internode. The openings of these face the cells from 

 which they rise. 



Explanation of Figures. 



Plate 58. — Fig. 4, specimen, natural size. Fig. 4a, portion, magnified, showing, in 

 addition to the details of the cells, also two branches originating from the front of the upper 

 internodes. Fig. 46, three-celled internode at a bifurcation, more highly magnified. 



Plate 58, Fig. 5. 



MENIPEA TRICELLATA (Busk). 



Description. — Cells three in an internode, narrowed downwards, elongated; 

 connecting* tubes short and double ; aperture small, with a granular thickened 

 margin ; 4 or 5 long slender spines articulated to the upper and outer margin ; 

 opercular spine simple, springing from the inner margin. Avicularia opening nearly 

 opposite the lower edge or middle of the aperture. 



Reference. — Busk, Voy. Rattlesnake, i., 873 ; Brit. Mus. Cat. Mar. Polyz., 

 p. 28, pi. xli. 



[ 34] 



