BOTRYLLUS VIRESCENS. G5 



filaments pale yellow. The individuals arranged in 

 circular or oval systems (figs. 123 and 124) of from 

 six to twelve around a largish common aperture 

 margined with red. 



Diameter of the mass from one to two inches 

 (25-50 mm.). 



Hob. On the underside of stones between tide- 

 marks. [On stones and on stems of Laminaria digitato, 

 etc. (Codes). ~] 



ENGLAND. Cullercoats, JSTorthumb. (Alder fy Han- 

 cock). [Falmouth, Cornwall (Gocks)J\ 

 First record. Alder & Hancock, 1848. 



FIG. 124. A variety of Botryllus virescens. Systems of from seven 

 to ten individuals. Enlarged. 



When magnified the colour of the colony in this 

 species is shewn to be formed by a copious sprinkling 

 of opaque spots, of varying intensity on the lower part 

 and sometimes extending around the disc. 



[A very pretty variety, with a red thorax and a 

 larger excretory orifice to the systems than in the 

 type, is figured (PL LXI, fig. 11, and fig. 124 in text.)] 



4. Botryllus smaragdus Milne Edwards. 

 [? Botryllus Borlasii Fleming.] 



(Plate LXII, fig. 1; PL LXVI, fig. 1; and fig. 1256 



in text.) 



[t Alcyoni-um BOELASE Nat. Hist. Cornwall (1758), p. 254, 



pi. xxv, ft', in and iv.] 

 111. 5 



