CELLULARIA. oar 
Genus XV. CELLULARIA, Padias. 
Gen. Char. Polypidom calcareous or membrano-calcareous, 
confervoid, divided dichotomously; the divisions narrow, com- 
posed of two or three alternating series of oblong contiguous 
cells on 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. Cetiunarta citiata, Hilis. (Plate XVII. fig. 62.) © 
Hab. On corallines, roots, and also branches of Alge. 
Salcombe, Rev. T. Hincks; Irish coast, sparingly, W. 
Thompson; Peterhead, C. W. Peach; coast of Ayrshire, 
rare, D. L. Dr. Fleming says it is common; from which 
I conclude that it is much oftener met with on the northern 
and eastern shores of Scotland than on the western. J have 
had good specimens of it from Miss Allardyce, of Cromarty ; 
a very large specimen from Miss 8S. Beever, of Coniston, 
but I believe 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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