602 YALONIACEAE. 



2. SIPHONOCLADUS Schmitz, Ber. Sitz. Naturf. Ges. Halle 

 1878: 18. 1878 (?) 



1. Siphonocladus rigidus M. A. Howe, Bull. Torrey Club 32: 244. pi. 13. f. 1.; 

 pi. 14. 1905. 



In shallow water in rather protected places, sometimes forming pulvinate crusts 

 on corals, occasionally in tide-pools. New Providence, Great Bahama, Exuma Chain, 

 Cat Island, Atwood Cay, Mariguana, Caicos Islands, and Great Ragged Island : — 

 Bermuda, Florida, and Jamaica. Type from Key West, Florida. 



3. PETROSIPHON M. A. Howe, Bull. Torrey Club 32: 247. 1905. 



1. Petrosiphon adhaerens M. A. Howe, loc. cit. 248. pi. 15. 



Forming crusts and patches on calcareous rocks and corals near low-water mark 

 and in tide-pools, not uncommon. New Providence, Rose Island, Great Bahama, 

 Exuma Chain, Watling's Island, Mariguana, and Castle Island : — Bermuda, Cuba, and 

 Jamaica. Type from Silver Cay, in Nassau Harbor, N. P. 



4. CHAMAEDORIS Mont. Compt. Eend. Acad. Sci. 15: 171. 1842. 



1. Chamaedoris Peniculum (Ell. & Soland.) Kuntze, Eev. Gen. PI. 3: 400. 

 1898. 



Corallina Peniculum Ell. & Soland. Nat. Hist. Zooph. 127. pi. 7. f. 5-8 ; pi. 



25. f. 1. 1786. 

 Penicillus annulatus Lamarck, Ann. Mus. Hist. Nat. 20: 299. 1813. 

 Nesea annulata Lamour. Hist. Polyp. 256. 1816. 

 Clmmaedoris annulata Mont. loc. cit. 



Under shelving rocks near low-water mark, but more commonly found washed 

 ashore from deeper water. New Providence, Great Bahama, Abaco, Eleuthera, and 

 Exuma Chain : — Florida to Barbados and South America ; Mauritius ; Ceylon. Type 

 from the Bahama Islands. 



5. MECEODfCTYON Decaisne, Arch. Mus. Hist. Nat. 2: 115. 1841. 



1. Microdictyon crassum J. Ag. Anal. Alg. Cont. 1: 107. 1894. 



Common from low-water mark down to a depth of at least 8 meters ; especially 

 abundant on the " Long Bank " in 3-8 meters of water, growing particularly about 

 sponges. New Providence, Rose Island, Great Bahama, North Cat Cay, Long Bank, 

 Green Turtle Cay, Green Cay, Exuma Chain, Cat Island, Watling's Island, Atwood 

 Cay, Mariguana, and Caicos Islands : — Cuba. Type from the Bahama Islands. 



6. ANADYOMENE Lamour. Nouv. Bull. Sci. Soc. Philom. 3: 187. 1812. 

 [As Anadyomena..] 



1. Anadyomene steUata (Wulf.) Ag. Sp. Alg. 1: 400. 1822. [As Anady- 

 nomene stellata.] 



Viva stellata Wulf. in Jacq. Collect. 1:351. 1786. 



Anadyomena fiahellata Lamour. loc. cit. 



Anadyomene flahellata Lamour. Hist. Polyp. 366. pi. 14. f. 3. 1816. 



Not uncommon in shallow water and ranging down to a depth of at least 50 

 meters {-fide Borgesen). New Providence, Andros, Great Bahama, Exuma Chain, 

 Watling's Island, Mariguana, Caicos Islands, and Great Ragged Island : — Bermuda 

 and Florida to Brazil : ;Mediterranean and Adriatic seas. Type from the Adriatic Sea. 



Just above the low-water line under shelving rocks and on roots of Rhizophora, 

 there occurs a form of Anadyomene consisting chiefly of free or solute filaments, with 

 the pseudoparenchyma reduced to a small few-celled palmate-flabellate apical expan- 

 sion or wholly deficient. Possibly this represents a species bearing to A. stellata 

 about the same relation that Struvea anastomosans bears to the more elaborate 

 species of Struvea, but as conditions intermediate appear to occur, the writer prefers 

 to consider it a form, which may be designated as forma prototvpa ftvne Howe 58.'f2, 

 on roots of Rhizophora in a lagoon, Great Ragged Island, Dec. 26, 1907). 



