292 NATURAL HISTORY OP 



3. C. DiCHOTOMA, Hinds. 



C. attenuata {Alder), C. avicularia {Smitt). 



Hab. : South Devon, Oban {T. H.), Northumberland 

 {Alder), St. Andrews {McL), Wick (C. W. P.). 



This species grows erect to the height of about an 

 inch, and is found in deep water on other zoophytes. 



The cells are ovate and convex. Below the orifice 

 is a rostrum or projection, with an avicularium beside 

 it. Other avicularia are scattered about the colony. 

 The ovicels are globose, with distinct punctures. 



The zoaria are " dichotomously branched with great 

 regularity." A variety of this species (attenuata) is 

 recognized, which has the zoarium slender and of 

 uniform thickness. 



4. C. AVicuLARis, Hinehs. 



Hab. : South Devon, Cornwall, Oban {T. E.), St. 

 Andrews {McI), Shetland {A. M. N.). 



In this and the following species of this genus, an 

 erect growth is not attained, the zoaria being incrusting. 



This varies in shape according to the object upon 

 which it is developed. The zooecia are irregularly 

 placed, sometimes growing one on the top of another. 

 The different cells are ovate and punctured round the 

 margin, and the orifice is developed in its lower margin 

 into a pointed sinus, on one side of which are a rostrum 

 and an avicularium. There are also scattered avicularia 

 on other parts of the colony. 



5. C. TUBIGERA, Bush. 



Hab. : South and West Coasts of Britain {Busk), 

 Arran {West). 



Described by Mr. Busk (Crag Polyzoa, 60). 



6. C. ARMATA, HincJcs. 



Hab. : Hastings {Miss Jelly), Cornwall {T. H). 



