Zoology.-] NATURAL HISTORY OF VICTORIA. [Folyzoa. 



Plate 46, Fig. 6. 



DIMETOPIA CORNUTA (Busk). 



Descrittion. — Colls with the aperture very oblique, wider above and nearly 

 triangular; margin thickened, with a spine at each upjiei' ans'le and 1 or occasionally 

 2 at tlie lower. Ovicells nearly o'lobular, above and to the inner side of the aperture. 



Reference. — Busk, Voy. Batt., i., p. 384; Cat. Mar. Pol. Brit. Mus., p. 35, 

 pi. xxix., figs. 2, 3. 



QueeusclifF ; Sealer's Cove, Baron von Mueller ; Portland, Mr. 

 Maplestone. 



This is of considerably smaller size than the last species. The 

 cells are much smaller ; the opening is very oblique, and much 

 wider above ; the margin is thickened, but not with the same deep 

 band as in D. spicata, and there are usually 3 spines, 1 fi'om each 

 angle superiorly, and 1, or occasionally 2, from the middle in fi'ont. 

 The ovicell is small, round, and situated above and to the inner 

 side of the aperture. 



Explanation op Figdres. 



Plate 46. — Fig. 5, specimen, natural size. Fig. 5a, portion, magnified. Fig. 56, small 

 portion, sliowing an ovicell. 



Plate 46, Fig. 6. 



DIDYMIA SIMPLEX (Busk). 



[Genus DIDYMIA (Busk). (Sub-kingd. MoUusca. Class Polyzoa. Order Infundibulata. 

 Sub-( )rdcr Cheilostomata. Fam. Gemellariida!.) 



Gf)i. Char. — Cells jnined side to side, all facing the same way, each pair arising from the 

 pair next below it ; ajierture large, wholly anterior ; at a bifurcation cells not disjunct, and each 

 giving origin to a pair.] 



Description. — The only species. 



Reference.— Busk, Voy. Ratt., p. 383; Cat. Mar. Pol. Brit. Mus., p. 35.. 

 pi. xxxix. 



Queenscliff ; Portland, Mr. Maplestone. 



[ ^4] 



