REPOET ON THE POLYZOA. 
37 
Cellularia (sp.), Pallas, Johnst., &c. 
Cellaria (sp.), E1L and Soland. 
Biujulina, Crisalaria, Flabellaria , Gray. 
Avicella, v. Bened. 
Ornitliopora, Ornithoporina, Cellularia (pars), d’Orb. 
Bicellaria (sp.), v. Bened. 
Halophila (sp.), Bk. 
Character. — Zooecia bi- or multiserial, closely contiguous and united, arising in con- 
tinuous series each from the back of the subjacent one. Aperture partial or entire. 
Avicularia when present always on the anterior aspect of the zocecia. 
In order to include several of the species in the present collection, and to avoid the 
creation of one or more new genera, I have thought it better in this catalogue so to modify 
the definition of Bugula as to admit of these, for the most part, new forms being placed 
in it. And this wider definition, resting mainly as respects the distinction of Bugula 
from Bicellaria upon the mode of gemmation and inter-connection of the zocecia, allows 
of Halophila being included under it, which in fact differs in no essential particular from 
such an unarmed form, for instance, as Bugula neritinci. 
The group, however, as thus made up, includes several apparently distinct types, which 
will probably at some time be thought of at least sub-generic value. 
To indicate what is meant by these sub-generic or generic groups, I venture to 
propose the following scheme. 
§ a. Those species in which in one part of the zoarium the branches are biserial and 
in another tri-, or quadri-serial, the intermediate series only including the fertile zooecia, 
the ooecia being lodged within the superjacent zocecium, whilst the avicularium is 
subsessile at the bottom of the zooecium in front. 
1. Bugula versicolor, n. sp. (PI. III. fig. 4). 
2. Bugula leontodon, n. sp. (PI. X. fig. 3). 
3. Bugula sinuosa, n. sp. (PI. X. fig. 2). 
4. Bugula mirabilis, n. sp. (PI. X. fig. 1). 
§ (3. Those in which the zooecia are much attenuated downwards, and the avicularia 
are supported on very long, flexible, and probably contractile pedicels. 
5. Bugula reticulata, n. sp. (PL VIII. fig. 3). 
6. Bugula bicornis, n. sp. (PI. IX. fig. 1). 
§ y. Those in which the zooecia are usually oblong and little or not at all attenuated 
downwards, and have shortly pedunculate avicularia, usually articulated to the margin 
of the aperture, such as Bicellaria Jlabellcita, turbinata, avicularia, plumosa, See. 
