42 
CLASS L— ORDER I. 
22. Cellepora Pallasiana. Cells oval, slightly 
convex, and punctured ; openings round above, and 
transverse-oblong in the lower part. 
Mediterranean. 
23. Cellepora Borniana. Cells alternate and trans- 
parent ; the opening an almost four-sided oval, drawn 
in at two of the sides, and closed by a small mem- 
brane slightly punctured. 
Mediterranean. 
24. Cellepora otto-mulleriana. Cells a little con- 
vex and opaque ; the opening a longish oval, closed 
by a smooth membrane, 
Mediterranean. 
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FLUSTRA. 
Crust ac eous Polypidoms, or of a leafy appear- 
ance, horny or nearly membranous, consisting of short 
tubular polypiferous cells, placed at the side of each 
other, and disposed in regular series on one or more 
surfaces. 
That character of existing union, which, in our in- 
troductory history of Polypidoms, we observed was the 
chief peculiarity by which Polypidoms could be defined, 
seems to claim an exception with the Celleporas, and 
also with the Flustras, whose polypi, in their mem- 
brano-calcareous cells, appear distinct and unconnect- 
