8 LIVERPOOL BIOLOGICAL SOCIETY. 
G. corallina, Ag. 
Isle of Man (M); locality not recorded (L). 
G. equisetifolia, Ag. 
In drift on Lancashire and Cheshire coasts (M). 
Ptilota elegans, Bonnem. 
P. sericea, Harvey. 
Common (M); abundant at Puffin I. (G). 
P. plumosa, Ag. 
Locality not recorded (M and Li); Puffin I. (G). 
Ceramium tenuissimum, J. Ag. 
C. nodosum, Harvey. 
Eilbre (Nb). attim L(G): 
C. fastigiatum, Harv. 
Hilbre I. (M). 
C. deslongchampu, Chauv. 
Hilbre I., New Brighton (M). Very abundant on 
Puffin I., parasitic on many species of Algze (M and 
G). The figure shows a branch of C. deslongchampu 

with twigs transformed into clasping organs. In 
this case the supporting plant was a stout filament 
of Porphyra laciniata, but I have found it with 
similar attachments to Chylocladia articulata, Cera- 
mium rubrum, and other species. In some specimens 
