Zoology.'] NATURAL HISTORY OF VICTORIA. [Polyzoa. 



Plate 107, Pio. 2. 



CATENICELLOPSIS DELICATULA (J. B. Wilson). 



Description. — Cells elongated; mouth arched above, hollowed, slightly bulg- 

 ing below; on each side abroad aviculnrian process, directed outwards and forwards, 

 extending from the summit of the cell to opposite the lower lip, and with a deep 

 excavation lodging an avicularium ; surface smooth ; a short narrow, sub-lateral 

 vitta on each side; posterior surface finely sulcate; ovicell globular, sub-immersed 

 in the base of the upper of two coalescent cells. 



Reference. — J. Bracebridge Wilson, Tr. Mic. Soc. Vict. 1880. 



Spring Creek, Mr. J. B. Wilson. Port Phillip Heads. 



This, like the last, occurs in small, glassy, parasitic tufts. The 

 cells are elongated, and have on each side a small sub-lateral vitta. 

 There is also on each side a broad, lateral process, directed consider- 

 ably forwards, the outer part of which has a deep cup containing 

 an avicularium. The ovicell is cemented to the base of the upper 

 of two coalescent cells, the lower of which has, in the place of the 

 usual avicularian process, a stout, blunt, digitiform prolongation. 



Explanation or Figures. 



Plate 107. — Fig. 2, specimen, natural size. Fig. 2a, small portion, magnified, showing 

 ovicell and origin of three branches from a geminate pair. 



I am doubtful whether Catenicellopsis ought to be separated 

 from Catenicella. The character on which the genus has been 

 founded is the frequent origin of the cells and branches from 

 the sides of the cells, and not always from the summits of the 

 cells of geminate pairs, as seems invariably to occur in the true 

 Catenicellce. 



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