70 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 
Tribe Griffithsie. 
Griffithsia, C. Ag. 
G. corallina, C. Ag. 
G, setacea, C. Ag. 
Tribe Callithamniez. 
Rhodochorton, Nig. 
RL. floridulum, Nig. 
Callithamnion, Lyngb. 
C. polyspermum, C. Ag. 
C. Hookeri, C. Ag. 
C. arbuscula, Lyngb. 
C. tetragonum, C. Ag. 
C. corymbosum, Lyngb. 
C. granulatum, C. Ag. 
C. byssoides, J. Ag. 
Tribe Ptilotez. 
Plumaria, Schmitz. 
P. elegans, Bonnem. 
Ptilota, C. Ag. 
P. plumosa, C. Ag. 
Tribe Crouaniez. 
Antithamnion, Nig, 
A. plumula, Thur. ( = Callithamnion plumula, Phye. Brit. ). 
Tribe Ceramiez. 
Ceramium, Lyngb. 
C. tenuissimum, J. Ag. (= C. nodosum, Phye. Brit.). 
C. diaphanum, Roth. 
C. rubrum, C. Ag. 
C. acanthonotum, Carm. 
ORDER DUMONTIACEZ. 
Dudresnaya, Bonnem. 
D. coccinea, Bonnem. 
Dilsea, Stackh. 
D. edulis, Stackh. 
Tribe Halarachniez. 
Halarachnion, Kiitz. 
H, ligulatuwm, Kiitz. (= Halymenia ligulata, Phyc. Brit.). 
Furcellaria, Lamx. 
Lf. fastigiata, Lamx. 

