616 C'ODIACEAE. 



5. Halimeda tridens (Ell. & Soland.) Lamour. Hist. Polyp. 308. 1816. 



Corallina tridens Ell. & Soland. Nat. Hist. Zooph. 109. 1786. 

 Corallina incrassata Ell. & Soland. loc. cit. 111. 

 Halimeda incrassata Lamour. Hist. Polyp. 307. 1816. 

 Halimeda brevicaulis Kiitz. Tab. Phyc. 8: 11. pi. 25. f. II. 1858. 



Very common on a sandy or muddy bottom from near the low-water mark down 

 to 40 meters or more. New Providence, Rose Island, Andros, Great Bahama, North 

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

 Marihuana, Caicos Islands, Castle Island, Great Ragged Island, Salt Cay, and 

 Anguilla Isles : Bermuda and Florida to Guadeloupe ; also in the tropical seas of 

 the Eastern Hemisphere. Type from the Bahama Islands. 



6. Halimeda Monile (Ell. & Soland.) Lamour. Hist. Polyp. 306. 1816. 



Corallina Monile Ell. & Soland. Nat. Hist. Zooph. 110. 1786. 

 Halimeda incrassata monilis Harv. Ner. Bor.-Am. 3: 24. 1858. 

 Halimeda tridens Monile M. A. Howe, Bull. Torrey Club 32: 564. 1905. 



Common on a sandy bottom, often with H. tridens and H. simulans. but dis- 

 tinct. Rose Island, Cat Island, Watling's Island, Mariguana, Caicos Islands, Great 

 Ragged Island, Salt Cay, and Anguilla Isles : Bermuda and Florida to Guadeloupe 

 and Panama (Colon). Type from Jamaica. 



7. Halimeda simulans M. A. Howe, Bull. Torrey Club 34: 503. pi. 29. 1907. 



On a sandy bottom, rocks, old corals, etc., from near low-water mark down to 

 a depth of several meters. Berry Islands, Atwood Cay, Mariguana, Caicos Islands, 

 and Great Ragged Island : Bermuda. Florida. Cuba, Jamaica, Porto Rico, American 

 Virgin Islands, and Panama (Colon). Type from Culebra Island, Porto Rico. 



8. Halimeda favulosa M. A. Howe, Bull. Torrey Club 32: 563. pi. 23; pi. 24; 



pi 26. f. 1-6. 1905. 



On a sandy bottom in shallow water. Rose Island and Exuma Chain. Type 

 from Cave Cays, Exuma Chain. Apparently endemic. 



9. Halimeda lacrimdsa M. A. Howe, Bull. Torrey Club 36 : 93. pi. 4. f. 1 ; pi. 6. 



f. 3-11. 1909. 



On a sandy bottom from near low-water mark down to a depth of 1020 

 meters or more. Exuma Chain, Mariguana, and Great Ragged Island : Cuba. 

 Type from Mariguana. 



8. CODIUM Stackh. Ner. Brit, xvi, xxii, xxiv. 1797. 



LAMARCKIA Olivi, Zool. Adriat. 258. 1792. Not LAMARCKIA Medic. 1789. 



SPONGODIUM Lamour. Essai 71, 72. 1813. 



AGARDHIA Cabrera; Ag. Syn. Alg. Scand. xxiv. 1817. 



Thallus mostly erect and fruticose. 



Peripheral utricles cylindric-clavate, mostly 75-200 & in max. diam. ; thallus dull 

 and rather rigid when dry, the branches not con- 

 stricted at base. 1. C. tomentosum. 

 Peripheral ntn'^lps ohovoid. ohoonic, n r goblet-shaped, 

 mostly 150-300 //, in max. diam. ; thallus commonly 

 nitent and rather flaccid when dry, the branches con- 

 stricted at base. 2. C. isthmocladum. 

 Thallus adherent, prostrate, or repent. 3. C. intertextum. 



1. Codium tomentosum (Huds.) Stackh. Ner. Brit. xxiv. 1797. 

 Fucus tomentosus Huds. Fl. Angl. 584. 1778. 



On rocks, etc.. in shallow water . North Cat Cay. Eleuthera. Atwood Cay. and 

 Caicos Islands: Bermuda and North Carolina to' Panama (Colon) and 'South 

 America ; widely distributed in the warmer seas. Type from Great Britain. 



Codium decorticatum (Woodw.) M. A. Howe (G. elonfjatnm Ag. ) has not yet 

 been reported from the Bahamas, but is likely to occur. It differs from C. tomen- 

 tosum in being more elongate, more sparingly branched, by flattened expansions 

 under the dichotomies, and by the much larger utricles. 



