Abstract
Four Chaetophoraceae (1-4) known previously for Europe and 2 other spp. a Chaetophoraceae (5) and a Chaetosphaeridiaceae (6) reported from the W. Indies, were found at Woods Hole, Mass., during the summers of 1939 through 1942: 1) Phaeophila engleri, inhabiting the shells of certain common molluscs and of Spirorbis spirorbis and imparting a grass green color to them; 2) Ectochaete lepto-chaete, endophytic in the walls of Polysiphonia novae-angliae, Chondrus crispus and Sargassum filipendula; 3) Entocladia testarum forming, along with Phaeophila engleri and Gomontia polyrhiza, a green growth in'' the shells of Mya arenaria; 4) Ochlochaete lentiformis, growing on the shells of certain molluscs, on pebbles and on bits of porcelain; 5) Ectochaete vagans (Borgesen) comb. nov. (Endoderma v. Borgesen), endophytic in the walls of Polysiphonia flexicaulis and P. harveyi var. olneyi; and 6) Diplochaete solitaria, epiphytic on P. harveyi var. olneyi.

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