20 COLLINS AND HEEVET. 



5. 0. CoRALLiNAE Gomont, 1893, p. 238, PI. VI, fig. 21. On 

 Codium tomentosum, Cooper's Island, April, Collins. 



*6. O. TENTjis Ag. var. TEEGESTixA Rabenhorst ex Gomont, 1893, 

 p. 241. Among other algae in a ditch in meadow by SheUy Bay, Aug., 

 CoUins. 



*7. O. AMPHIBIA Gomont, 1893, p. 241, PL ^^I, figs. 4-5 ; P. B.-A., 

 No. 1852. In brackish pool among other algae, April, Aug., Collins. 



*8. O. AMOENA Gomont, 1893, p. 245, PI. ^HCI, fig. 9. Fornung a 

 thin coating on rock at Inlet, Aug., Collins. 



*9. 0. LAETEVIEEXS Crouan ex Gomont, 1893, p. 246, PI. VII, 

 fig. 11. Among other algae, Tucker's Town, May, Collins. 



*10. 0. roEMOSA Bory ex Gomont, 1893, p. 250, PL VII, fig. 16. 

 In a puddle of rain water in road, April, CoUins. 



11. O. LONGEAETicuLATA Hansgirg ex Forti, 1907, p. 176. On 

 Codium, near Causeway, April, Hervey. We have not seen an au- 

 thentic specimen of this species, but our plant agrees with the original 

 description, with no description in Gomont, and with none but this 

 in Forti. 



Trichodesmium Ehrenberg. 



T. TmEBAurn Gomont, 1893, p. 217, PL VI, figs. 2-4; Wille, 1904, 

 p. 57, PL I, figs. 17-22. Hamilton Harbor, WUle, 1. c.^ 



Phoemidium Kiitzing. 



1. Trichomas strongly moniliform. 1. P. fragile. 



1. Trichomes not moniliform. 2. 



2. Stratum purple or pink. 2. P. liiridum. 



2. Stratum greenish or blackish. 3. 



3. Trichomes 3 n diam. or less. 3. P. valderianum. 



3. Trichomes 4-12 ft diam. 4. P. Retzii. 



1. P. FEAGiLE Gomont, 1893, p. 183, PL IV, figs. 13-15. Among 

 other algae in an incrustation in rock between tide marks, April, 

 CoUins. 



*2. P. LUEiDUM Gomont, 1893, p. 185, PL IV, figs. 17-18; P. B.-A., 



6 Catagnymene pelagica Lemmermann var. major Wille, 1904, p. 51, pi. I, 

 fig. 7, is reported by Tilden, 1910, p. 159, as occurring at Bermuda, but we 

 are unable to obtain any confirmatory evidence. WiUe, 1. c, reports it from 

 open sea, at several points. Dermocarpa Leibleinii (Reinsch) Bomet var. 

 pelagica WiUe, also appears in Tilden, 1910, p. 55, as from Bermuda on 

 authority of Wille, 1904, p. 50; but Wille's record is 39° 4' X., Long. 57° 8''w., 

 " ungefahr in der Mitte zwischen den Bermuda-Inseln und Xew Foundland." 



