CELLULARIA. 337 



Genus XV. CELLULAEIA, Dallas. 



Gen. Char. Polypidom calcareous or membrano-calcareoiis, 

 confervoid, divided dichotomously ; the divisions narrow, com- 

 posed of two or three alternating series of oblong contiguous 

 cells ou a single plane ; the apertures lateral, oblique, and facing- 

 one way. Polypes ascidian, with usually fourteen tentacula ; no 

 gizzard. — Johnston. 



^ Aperture of the cell terminal. 

 1. Cellulaeia ctliata, MUs. (Plate XVII. fig. 62.) 

 Hab. On corallines, roots, and also branches of Algee. 

 Salcombe, Eev. T. Hincks; Irish coast, sparingly, W. 

 Thompson; Peterhead, C. W. Peach; coast of Ayrshire, 

 rare, D. L. Dr. Pleming says it is common; from whicli 

 I conclude that it is much oftener met with on the northern 

 and eastern shores of Scotland than on the western. I have 

 had good specimens of it from Miss Allardyce, of Cromarty ; 

 a very large specimen from Miss S. Beever, of Coniston, 

 but I beheve it was from, a friend (Miss Hislop) in the Isle 

 of Man ; and I have often got it in little tufts on seaweeds, 

 sent me in a rough state from the south of England. 



The little tufts are from half an inch to nearly an inch in 

 height, delicate, of pellucid whiteness, and dichotomously 

 branched. The cells crown the top of the branches; the 



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