BRITISH TUNICATA. 



The foregoing is Savigny's brief diagnosis of a species 

 observed by Graertner on the English coast and com- 

 municated to Pallas by him. Whether it is correctly 

 referred to Botrylln* is open to doubt, and even its 

 inclusion with the Tunicata has been questioned. 



Graertner described the individuals as " raisins " 

 with toothless terminal apertures, most of them being 

 obovate, subimbricate, smooth, and whitish in colour, 

 adhering by their blunt ends to the surface of the body 

 (the incrusting mass), which is gelatinous, soft, convex, 



FIG. 135. Two colonies of Botryllus conglomeratus (a, a) on a frond 

 of Fucus nodosus, natural size, with one of them magnified. 



and adheres to marine plants. The branchial apertures 

 (terminaliperforati) are fairly large, the other extremity 

 being more slender, incurved, and having very small 

 apertures (atrial ?), while the central cavity (common 

 cloacal canal) is funnel-shaped and encircled with 

 a whitish contractile margin. 



Graertner mentions the " ovules " as being globose, 

 whitish, and spread over the gelatinous substance. 



The species is met with but rarely, he said, on 

 a F ucii s, chiefly xcriritiis and nodoxus.~\ 



