280 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



which penetrates the outer layer of the host, and begins to 

 branch almost immediately. The species is probably to be 

 found everywhere in the dead and faded Zostera leaves in marsh 

 pools. 



4. E. PITHOPHORAE West, 1905, p. 283. Epiphytic; fila- 

 ments not over 200 //.long, irregularly branched, branches atten- 

 uate, more or less concrete ; cells 25-38 /x diam., subglobose, 

 ellipsoid, ovoid, or oblong ; apical cell 10-16 ^ diam. ; cell with 

 one pyrenoid, membrane 3-4 ^ thick. Barbados. 



This species was found growing on Pithophora Cleveana, on or 

 in the immediate vicinity of the intercalary spores ; like the 

 following species it is not at all endophytic, and thus connects 

 Endoderma with Epicladia, but the filaments do not unite to form 

 a definite disk. 



5. E. POLYMORPHUM West, 1905, p. 283, PI. CCCCLXIV, 

 fig. 19. Epiphytic; filaments up to 250 /u. long, irregularly 

 branching and anastomosing; cells flattened, polymorphous, 

 very irregular in form, 15-39X6-20^; thickness of membrane 

 3-7.5 fj. ; cell with one pyrenoid. Barbados. 



This species occurs on the same host as E. Pithophorae , but 

 on vegetative cells only ; the flattened cells, with very irregular 

 outline, seem to distinguish it from its companion. 



3. TELLAMIA Batters, 1895, p. 315. 



Frond of radiating, irregularly branched filaments, creeping 

 in the periostracum of mollusca ; parietal chromatophore nearly 

 filling the cell, with one pyrenoid ; cells often swollen ; asexual 

 reproduction by zoospores, formed in slightly swollen cells. 



The two known species occur often in company, in the outer 

 skin of the shells of Littorina, forming a more or less dense net- 

 work, but not penetrating the shell itself. The color of the 

 shells they inhabit is changed from bright yellow to some shade 

 of dull yellow or brown. 



T. CONTORTA Batters, 1895, p. 316, PI. XI, figs. 18-24. 

 Filaments yellowish green or brown, densely and irregularly 

 branched; cells 6-9X3-10 /A, ovoid or ellipsoid; branching of 

 two kinds, horizontal, similar to the main filament, branches 

 sometimes falcate or coiled, often anastomosing ; vertical, 

 branches short, often united laterally, with acute terminal cells ; 

 inflated cells, up to 20 fj. diam., occasionally occurring in the 

 horizontal branches. Figs, in, 112. On Littorina palliata 

 Gould. Southern Mass. England. 



