22 BOTRYLLIDiE. 



son. Very generally distributed around our shores : it ranges to 

 the Mediterranean. 



8. B. GEMMEus, Savigny. 



Mem. pt. ii. p. 203. 



" Body forming a thin, gelatinous, sub-orbicular greyish crust, 

 with yellowish marginal tubes. Systems isolated, or few and 

 scattered, commonly composed of from five to twelve or more in- 

 dividuals, with oval summits of a yellow or golden-grey colour. 

 Orifices terminated with white ; radial line bordered with white." 

 — Savigny. 



Diameter of mass, according to Savigny, not exceeding an 

 inch ; but it occurs much larger. Individuals one-thirtieth of an 

 inch. 



"Adhering to fuci dredged in Belfast Bay by Mr, Getty," W. 

 Thompson, Annals, 1844. Ballaugh, Isle of Man, adhering to 

 stones at low-water, E. F. 



4. B. vioLACEus, Milne-Edwards. 



M^m. Asc. Comp. p. 300, pi. C, fig. 4, 4". 



Common integument pale greenish-grey. Tunics of individuals 

 deep blue, except around the cloacal opening, where they are yel- 

 lowish-white ; and between that opening and the mouth there is 

 a radiating space of the same colour, divided by a violet line, so 

 that each system forms a blue rosette, with a yellow central star. 

 Animals small. 



" Common on the Cornish coast," Mr. Alder. 



5. B. sMARAGDus, Milne-Edwards. 



Mem. Asc. Comp. p. 307, pi. G, fig. 6, 6". 



General integument yellowish-green. Individuals much larger 

 than in the last species; their tunics apple-green or yellowish, 

 bright yellow round the mouth, and between the mouth and the 

 cloacal orifice presenting an oval yellow space, divided by green 

 lines, radiating from a central vermilion or orange spot. 



On fuci. " A green species, which I think is the smaragdus, 

 is common on the Cornish coast," Mr. Alder. "North of Ireland," 

 Mr. Thompson. 



