NATURAL HISTORY. 
lel tubes. Fructification ovate capsules, and granules 
in swollen branchlets. 
1 P. Fastierata. Dillw. t. 447. E. Bot. t. 
1764. (Conr. PoLyMorPHA.) © 
2. P. Fucoipes. Dillw.t.75. (Conr. Fu- 
COIDES,) and also t. 81. (Conr. NIGRESCENS.) 
3. P. Grirritustana. E. Bot. t, 2312. 
(Conr. GRIFFITHSIANA.) 
4. P. Byssoipes. E, Bot.t. 347.  (Conr. 
Byssorpes.) Amongst regectamenta, on the 
beach of the Exmouth warren, P. GRIFFITH- 
SIANA is found on the shores of Torbay. The 
two first named species are of frequent occur- 
rence, attached to rocks and Fuci. 
CERAMIUM. 
This genus has filaments composed of simple tubes, 
bearing capsules surrounded by an involucre of short 
branchlets. 
1, C. Evone@atum. Dillw. t. 33. (Conr. 
ELoneata.) Common,—attached to rocks, 
fuci, &c. 
2. C. Rusrum. Dillw.t.34. (Conr. Ru- 
BRA.) Ditto. 
3. C. DiapHanum.  Dillw. t. 88.  (Conr. 
DirapHANa.) Back of Exmouth warren. 
4, C. Cixviatum. Dillw. t.33, (Conr. Cr- 
LiaTA.) Den of Teignmouth, 
