Zoology.] NATURAL HISTORY OF VICTORIA. [Polyzoa. 



readily distinguished by the submarginal denticle at the back of 

 the mouth. It is very closely allied to the European C. denticulata. 



Explanation of Figures. 



Plate 39. — Fig. 3, natural size. Fig. 3a, front view, magnified, showing an ovicell on a 

 twisted branch. Fig. 36, back, magnified. Fig. 3c, ovicell. 



Plate 39, Fig. 4. 



CEISIA SETOSA (P. McG.). 



Description. — Cells 4-10 in an internode, minutely punctate, elongated, the 

 upper part projecting" slightly ; mouth circular. A single long, slender, jointed spine 

 articulated to a projection immediately below and behind the mouth. Branches 

 given off irregularly. Joints brown. 



Reference. — P. H. MacGillivray, Trans. Roy. Soc. Vict., 1868. 



William stown and Queenscliff. 



This differs from all the other described multicellular species in 

 the presence of the articulated spine. 



Explanation of Figures. 



Plate 39. — Fig. 4, natural size. Fig. 4a, specimen, magnified. Fig. 4b, another specimen, 

 magnified, showing an abortive internode. 



Plate 39, Fig. 5. 



CRISIA TENUIS (P. McG.). 



Description. — Cells 6-13 in an internode, much elongated, slender, closely 

 adnate in great part of their length, minutely punctate, upper part free and turned 

 forwards; mouth circular, unarmed. Branches given off irregularly, occasionally 

 more than one from an internode. Ovicell small, nearly globular or pyriform, 

 situated on the front of an internode at a bifurcation. 



Queenscliff, growing on the roots of alga3. 



A very distinct, small, slender, delicate species. 



Explanation op Figures. 



Plate 39. — Fig. 5, natural size. Fig. 5a, specimen, magnified. Fig 5b, young specimen, 

 magnified. Fig. 5c, portion, showing ovicell. 



[39] 



