Zoology.] NATURAL HISTORY OF VICTORIA. [Polyzoa. 



Plate 46, Fig. 2. 



DIACHORIS MAGELLANICA (Busk). 



[Genus DIACHORIS (Busk). (Sub-kingd. Mollusca. Class Polyzoa. Order Infundi- 

 bulata. Sub-Order Cbeilostomata. Tarn. Flustridse.) 



Gen. Char. — Polyzoary erect or decumbent. Cells disposed in a single layer, disjunct, each 

 connected with 6 others by regularly arranged tubes.] 



Description. — Cells remote, boat-shaped, semi-erect ; mouth arched above and 

 straight or hollowed below, with a slightly thickened rim; margin unarmed. A 

 capitate avicularium on each side above, directed nearly vertically, and opening 

 horizontally forwards. 



Reference. — Busk, Voy. Ratt., i., 382; Cat. Mar. Pol. Brit. Mus., p. 54, 

 pi. lxvii., figs. 1, 2. 



Portland, Mr. Maplestone. 



D. Crotali, of which I have specimens, but not received in time 

 for illustration in the present plate, is distinguished by the different 

 form of the avicularium, which is represented by a lanceolate 

 process without any mandible. 



Explanation op Figures. 



Plate 46. — Fig. 2, specimen, natural size. Fig. 2a, small portion, magnified, showing the 

 front of the cells. Fig. 2b, the same, viewed from behind. 



Plate 46, Fig. 3. 



DIACHORIS SPINIGERA (P. MacGil.). 



Description. — Cells elongate- oval ; 2 or 3 long, straight spines springing from 

 the margin above, and a series, usually about 5, of long slender incurved spines 

 arising from the margin on either side. A large pedunculate avicularium on one 

 side near the mouth. 



Reference. — P. H. MacGillivray, Trans. Roy. Soc. Vict., 1859. 



Queenscliff ; Wilson's Promontory, Baron von Mueller ; Port- 

 land, Mr. Maplestone. 



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