70 COLLINS AND HERVEY. 



5. E. SANDRIANUS Zanardini, 1843, p. 41 ; 1865, p. 143, PL LXXIV. 

 B; E. elegans Thuret in Le Jolis, 1863, p. 77, PL II, fig. 1-2; not 

 of Menegh. Shelly Bay, Jan., St. David's Island, Feb., Hervey; with 

 plurilocular sporangia. In both cases mixed with other species 

 of Ectocarpus; this mixture of species of Edocarpm is quite com- 

 mon and sometimes perplexing. It is the rule rather than the excep- 

 tion. 



6. E. DUCHASSAINGIANUS Grunow, 1867, p. 45, PL IV, fig. 1; 

 Vickers, 1905, p. 59; 1908, PL XXVII; Borgesen, 1914, p. 159, figs. 

 127-128; P. B.-A., No. 2077. Major's Bay, March, Hervey. On 

 sticks and twigs, outlet of aquarium, Agar's Island, Aug., Collins. 

 The Major's Bay plant agrees with Borgesen's description and figures, 

 and with a specimen of Miss Vickers, Barbados, No. 89. The plant 

 from the aquarium outlet differs in the absence of hairs, and in the 

 greater variability of form of the plurilocular sporangia. These are 

 often exactly like Borgesen's figures, but in other instances the cylindri- 

 cal or clavate body of the sporangium has a shortly acuminate or 

 subulate apex; the same occurs in Miss Vickers specimen. Unilocu- 

 lar sporangia were not seen. The cells were all very densely packed, 

 and it was only in the youngest that the irregularly rounded disks of 

 the chromatophores could be seen. Though there were no hairs, the 

 branches often ended in a long simple filament, 10-14 /JL diam., with 

 longer cells than in the rest of the plant, but all were well supplied 

 with chromatophores. The sporangia were sometimes sessile, oftener 

 on a short pedicel, occasionally terminating a branch, as shown in 

 Borgesen's fig. 128e. The cell bearing a sporangium was usually 

 distinctly shorter than the adjacent cells, as in E. indicus Sonder, as 

 noted by Mme. Weber, 1913, p. 129, fig. 34. We are inclined to agree 

 with Borgesen that E. Dwhassiangus may be merely a form of E. 

 indicus, but for the present it seems better to retain the former name. 

 The station where this plant occurred is a peculiar one; the salt water 

 outlet of the aquarium is well up in the rock at the shore of the island; 

 the water runs down into the sea, stalks of grass and other objects 

 reached by it being covered by a dense coating of various kinds of 

 algae, Enteromorpha predominating, but also other Chlorophyceae 

 and several Myxophyceae; the variations of this material from the 

 type may be due in some way to the exceptional conditions. 



7. E. ELACHISTAEFORMIS Heydrich, 1892, p. 470, PL XXV, fig. 14; 

 Borgesen, 1914, p. 174, fig. 137. On C odium decorticatum, Cooper's 

 Island, Aug., on Galaxaura squalida & Helminthodadia Calvadosii, 

 St. David's Island, April, Collins. The form reported by Borgesen 



