126 COLLINS AND HEEVEY. 



1. H. SECUNDA (Ag.) Falkenberg, 1901, p. 307, PL III, figs. 10-12; 

 P. B.-A., Xo. 2041; Hutchimia secunda Agardh, 1824, p. 149; Poly- 

 siphonia pecten-veneris Var. /S Harvey, 1853, p. 46, PI. XVI. D. On 

 reef, Ely's Harbor, Aug., Collins. In this material the erect branches 

 are often abortive, and the regularity of position of branches charac- 

 teristic of the species is obscured. 



2. H. TENELLA (Ag.) Nagcli, 1846, PI. YII, fig. 2; P. B.-A., No. 

 1943; Hutchimia tenella Agardh, 1828, p. 105. On rocks, corallines 

 and other algae, Harrington Sound, Bailey's Bay, Gibbet Island, 

 Jan., Smith's Bay, Feb., Nov., Harris Bay, April, Tucker's Town, 

 Dec, Hervey. 



3. H. PECTEN-VENEEis (Harv.) Falkenberg, 1901, p. 315; Polysi- 

 phonia pecten-veneris Harvey, 1853, p. 46, PI. XVI. C. Among 

 Gelidiopsis, Harris Bay, April, Hervey. A delicate and attractive 

 species; the graceful recurving of the branches easily distinguishes it. 



LoPHOsiPHONiA Falkenberg. 



1. Pericentral cells 10-16. 3. L. obscura. 



1. Pericentral cells 4. 2. 



2. Basal filament attached to substratum by filiform rhizoids, with or 



without disks. 1. L. bermudensis. 



2. Basal filaments penetrating the host by rhizoids much inflated below. 



2. L. Saccorhiza. 



1. L. bermudensis sp. nov.; Cellulis pericentralibus 4, interdum 

 5 aut 6; filamentis prostratis 100-110 /u diam., celluhs 1-2 diam. 

 longis; filamentis erectis numerosis, ad 60 segmentis longis, 60-80 /i 

 diam. a basi ad prope apicem; cellulis I5— 2 diam. longis, interdum 

 solummodo ^ diam. ; ramis plus minusve ramosis, aliquando densissime; 

 ramis bre^-ibus. Antheridiis conicocylindricis, 160-200 /i X 40-50 /i, 

 ad apicibus ramorum aggregatis; cystocarpiis subglobosis, laterahter 

 sessihbus, vel ad pedicellum perbreve, circa 250 n diam. ; tetraspor- 

 angiis circa 80 n diam., 2-5 in seriem rectilineam, in ramulis subin- 

 crassatis, saepe curvis. Plate III, figs. 18-21. 



Pericentral cells 4, occasionally 5 or 6; prostrate filaments 100-110 ^ 

 diam., cells 1-2 diam. long; erect filaments numerous, up to 60 cells 

 long, 60-80 M diam. from base to near apex, cells l§-2 diam. long, 

 occasionally only § diam.; more or less branched, sometimes quite 

 densely, branches short. Antheridia conical-cylindric, 160-200 X 

 40-50 /u, clustered at apices of branches; cystocarps subglobose. 



