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



Plate 24, Fig. 10. 

 CATENICELLA ELEGANS (Busk). 



Desceiption. — Cells ovate, papillose in front. Vittae sublateral, extending 

 about half-way up the cell. Lateral processes larg-e, projecting' slightly forwards, 

 blunt, with an excavation under the point for the small avicularium. Ovicell 

 superior, projecting on the surface of the cell above, with which it is incorporated, 

 with a smooth margin. 



Reference.— Busk, Voy. Ratt., i., 361 ; Cat. Mar. Pol. Brit. Mus., t. 9, f. 3, 4. 



Forming small glassy tufts, 1 to 2 inches high ; frequent. 



This is distinguished from the other small vittate species by the 

 short sublateral vittae and imperforate lateral processes. The ovi- 

 cell is of similar structure to that of C. Buskii, but the upper edge 

 is smooth. Thomson's C. Dawsoni, judging from his description 

 and figure, and from specimens which seem referable to it, I believe 

 to be a form of this species. 



Explanation of Fiqukes. 



Plate 24. — Fig. 10, natural size. Fig. 10a, front view of a branchlet of cells, magnified. 

 Fig. 106, back view of cells, magnified. 



Plate 24, Fig. 11. 

 CATENICELLA PERFORATA (Busk). 



Desceiption. — Cells elongated, minutely papillose in front. Vittae narrow, 

 lateral, extending the whole length of the cell. One or both lateral processes usually 

 large, triangular, pointed forwards, perforated at the base, or forming a blunt cupped 

 process. Ovicell galeate, sessile on one of the cells of a geminate pair, terminal, 

 smooth, or slightly tuberculate. 



Reference. — Busk, Cat. Mar. Pol. Brit. Mus., t. 8, f. 1, 2. 



Not unconmion. 



In most of the specimens with ovicells the lateral processes are 

 very small. 



Explanation op Figukes. 



Plate 24. — Fig. 11, natural size. Figs. 11a and lie, front view of cells, magnified. Fig. 116, 

 front view of double cell with ovicell, magnified. Fig. llrf, bacli view of cells, magnified. Fig. 

 lie, back view of ovicell, magnified. 



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