13 



again 2-lobed in a similar manner. Tetraspores are seen to be 

 arranged in a. single row, when viewed from the side, but when view- 

 ed from above, they are seen to be arranged in a double row. 

 Cystocarps globular and sessile. Colour beautiful-red." Okam. I. c. 



Hab. : On the shell of Haliotis gigatitia from a depth of 20 

 fathoms at Nemoto in Boshyu ; Enoshima (Prov. Sagami), Aburatsu 

 (Prov. Hyuga). Fruits : late in summer. 



PL. CIII, Fig. 1-5. Fig. 1 : sterile frond of Plocamium ovi- 

 formc Okam., \. Fig. 2 : terminal portion of the sterile frond, ^. 

 Fig. 3 : portion of a branch bearing sporophylls, ^. Fig. 4 : one of 

 sporophylls, ^. Fig. 5 : portion of a branch bearing cystocarps, 

 slightly magd. 



Plocamium oviforme Okam. 



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 C III H JR. 



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