48 COLLINS AA'D HERVEY. 



removed from the typical Mediterranean form. In the latter the 

 cells below are 6-8 diam. long, 2-4 diam. above, while in the present 

 species only the terminal cell is usually over 2 diam. long. It seems 

 to us safer to treat it as a new species than to put it in a species whose 

 tvpical form, at least, is so distinct. 



13. C. UTRICULOSA Kiitzing, 1843, p. 269; 1853, p. 26, PI. XCIV, 

 fig. I; Collins, 1909, p. 346; P. B.-A., No. 2014. Harrington Sound, 

 Wadsworth, IMarch; same station, Oct., Hervey. A common Medi- 

 terranean and West India species. Wadsworth's plants are rather 

 more slender than the typical, but otherwise quite the same. The 

 material collected by us in October formed loosely floating masses, 

 evidently a later condition; all branching was wide; the dichotomies 

 in the lower part about 120°, the ramuli, usually quite short, about 90°. 



14. C. CATENiFEEA Kutzing, 1849, p. 390; 1853, p. 24, PL 

 LXXXIII, fig. I; Collins, 1909, p. 347; P. B.-A., No. 2069. Kemp in 

 herb., as Cladophora sp.?; Howe; Red Bay, St. David's Island, June, 

 cave at Gravelly Bay, Feb., April, Dingle Bay, March, Hervey. 

 The most striking of our species of the genus, with stout stem and 

 main branches, very long cells, firm lustrous cell wall. Bermuda 

 plants are 10-20 cm. high; at Jamaica it sometimes reaches a height 

 of 50 cm. In February only very small plants were found. 



15. C. FULiGiNOSA Kiitzing, 1849, p. 415; Collins, 1909, p. 348; 

 P. B.-A., No. 2012. Kemp, St. George's, unnamed specimen in 

 herb.; Harris Bay, Jan., Apr., Gravelly Bay, Dec, Inlet, Dec, 

 Hervey; Gravelly Bay, Aug., Collins. A coarse species, generally 

 distributed and common; always infested with the fungus Blodgettia 

 Borneti Wright. The combination of the two forms the Blodgettia 

 confervoides Harvey, 1858, p. 48, PI. XLV. C. 



16. C. HowEi Collins, 1909a, p. 18, PI. LXXVIII, fig. 1; 1909, 

 p. 349. Tide pools. Gibbet Island, June, 1900, Howe. The short, 

 subsimple filaments arise from a dense mass of prostrate filaments, a 

 character found in no other of our species. Gibbet Island is the type, 

 and so far as known, the only, station for the species; so for the pres- 

 ent it may be considered as endemic. 



17. C. EEPExs (J. Ag.) Harvey, 1846-51, PL CCXXXVI; 

 P. B.-A., No. 2071. Conferva repens J. G. Agardh, 1842, p. 13; 

 Aegagropila repens Kiitzing, 1854, p. 15, PL LXX, fig. II. Gravelly 

 Bay, Jan., Feb., Hervey. A low, densely matted plant of dark color, 

 not however, with prostrate and erect filaments clearly differentiated. 

 The plant from California distributed under this name as P. B.-A., 

 No. 727 has since proved to be C. trichotoma (Ag.) Kiitz. ; the present 

 record is therefore the first for America. 



