Zoology.-] NATLTRAL HISTORY OF VICTORIA. [Polyzoa. 



Plate 24, Fig. 14. 

 CATENICELLA CRYSTALLINA (Wyv. Thomson). 



Description. — Cells pyriform. Lateral processes wide, extending as a broad 

 fringe the whole length of the cell. Vittfe narrow, reaching as high as the mouth. 

 Anterior surface smooth or with small papillfB. Back of cell sharply ridged. 



Eefekence. — Wyville Thomson, DubUn Natural History Review, April 1868. 



This species occurs in small glassy tufts on other polyzoa. It 

 is readily distinguished from all the other vittate species by the 

 very wide lateral processes which extend as a wide hollow fringe 

 the whole length of the cell. There is generally a minute avicu- 

 larium in a small cup-shaped depression, and there is usually an 

 arched opening or mark in the fringe opposite the cell mouth. 



Explanation of Figures. 



Plate 24. — Fig. 14, natural size. Fig. 14a, front view of a branchlet of cells, magnified. 

 Fig. 146, back view of a portion of ditto, magnified. 



Plate 24, Fig. 15. 

 CATENICELLA CAEINATA (Busk). 



Description. — Cells pyriform. Lateral processes very much produced hori- 

 zontally on either side. A minute denticle on either side of the mouth at the jnrc- 

 tion with the lower lip. A thin horny membranous area, below the lip, supports 

 three small conical elevations. Back caiinale. " Ovicelligerous cells gemina'e." 



Eeference.— Busk, Voy. Ratt., i., 3(33 ; Cat. Mar. Pol. Brit. Mus., t. C, f. 4, 5, 6. 



Forms small brownish tufts, rare. 



At once readily distinguished from all the other species by the 

 peculiar horizontally spreading lateral processes, and the promi- 

 nently ridged and umbonate back of the cell. In old specimens 

 the suboral horny part is thickened and the protuberances are 

 worn off, and there is then the appearance of three fenestrse. 



Explanation of Figukes. 



Plate 24. — Fig. 15, natural size. Fig. 15a, front view of a branchlet, showing side view 

 of cells also, magnified. Fig. 15i, back view of single and double cells, magnified. 

 Dec. ui. [ 25 ] D 



