CAMPANULARIA. ' 221 



stage, when dispersed as single hydrse, or when the zoophyte consists of 

 very few. They are numerously scattered over shells, founded on Ascidice, 

 or rooted on other products ; these are always larger and their colour more 

 vivid. 



From their frequency in the single state, together with the rarity of 

 adult and luxuriant specimens, the naturalist receives a useful warning 

 against presuming on the ultimate aspect of any zoophyte. Likewise, on 

 finding nothing but the twigs or pedicles of fallen bells, interspersed with ■ 

 vesicles, as in fig. 3, which very shortly follow them, he will perhaps deem 

 the Campanularian form too equivocal a characteristic of the species. 



Plate XII. Fig. 1. Sertularia (CampanulariaJ verticillata. 



2. Hydra displayed from its bell. 



3. Vesicles interspersed with twigs of fallen bells. 



4. Prolific vesicle. 



5. Prolific vesicle. 



6. Planula. 



7. Bell with a serrate lip. 



8. Regenerated portion, having lost the hydrse and bells. 



All the figures of this subject, except the first, are enlarged. 



§ 3. Sertularia (Campanularia) dumosa. — Pl. XXVI. Figs. 22-25. 

 — The narrow resemblance of this product to common furze, when viewed 

 by the naked eye, had induced me to name it Sertularia Ulejo, before 

 having been aware of its distinction otherwise. 



Though now enrolled by some authors with the Campanularice, its 

 structure is very different from that of the two preceding species. 



It appears, like many, under some modification ; but it does not seem 

 to grow in much luxuriance wherever I have sought it. 



The dumosa rises two or three inches, by a short stem, subdivided 

 meagrely into boughs and branches, with a slight incurvature. — PI. XXVI. 

 fig. 22. Long inverted, transparent, conical cells, not bells, issue from 

 around the boughs and branches, their opposite orifices being about a line 

 asunder. They seem disposed in pairs, that is, one opposite to the other, 



