614 CODIACEAE. 



straight and parallel, mostly 60-100 # in diameter ; 

 branches of corticating filaments of stipe com- 

 pactly cymose-fastigiate, the ultimate divisions 

 scarcely longer than broad, truncate, truncate-ob- 

 tuse, or commonly with expanded truncate-capi- 

 tate apices. 3. U. cyathiformis. 

 Filaments of flabellum appendaged ; calcareous sheaths, if 

 differentiated, non-porose. 



Filaments strongly constricted above dichotomies ; ap- 

 pendages crowned with 28 acuminate prongs or 

 spines. 4. U. spinulosa. 



Filaments not constricted above dichotomies ; append- 

 ages simple or sparingly furcate, obtuse, truncate, 

 or capitate. 5. U. Wilsoni. 



1 Udotea Flabellum (Ell. & Soland.) M. A. Howe, Bull. Torrey Club 31: 94. 

 1904. 



Corallina Flabellum Ell. & Soland. Nat. Hist. Zooph. 124. pi. 24. f. A, B, 



C. 1786. 



Flabellaria pavonia Lamarck, Ann. Mus. Hist. Nat. 20: 301. 1813. 

 Udotea flabellata Lamour. Hist. Polyp. 311. 1816. 

 Flabellaria incrustata Chauvin, Beclierches 123. 1842. 

 Udotea Halimeda Kiitz. Sp. Alg. 503. 1849. 



Common on a sandy or muddy bottom, from near low-water mark down to 

 30-40 meters. New Providence. Berry Islands, Great Bahama, Garden Cay. Bimini. 

 Exuma Chain, Watling's Island, Mariguana, Caicos Islands, Great Ragged Island, 

 and Salt Cay: Bermuda and Florida to Guadeloupe and Panama (Colon). Type 

 from " West Indies." 



2. Udotea conglutinata (Ell. & Soland.) Lamour. Hist. Polyp. 312. 1816. 



Corallina conglutinata Ell. & Soland. Nat. Hist. Zooph. 125. pi. ZS. f. 7. 



1786. 

 Flabellaria conglutinata Lamarck, Ann. Mus. Hist. Nat. 20: 301. 1813. 



On a sandy bottom from near low-water mark down to 14 meters or more. 

 New Providence, Andros, Joulter's Cays, North Cat Cay, Bimini, Green Cay, Wat- 

 ling's Island, Mariguana, Caicos, and Castle Island : Bermuda and Florida to the 

 American Virgin Islands. Type from the Bahama Islands. 



3. Udotea cyathiformis Decaisne, Ann. Sci. Nat. Bot. II. 18 : 106. 1842. 



Udotea conglutinata Vickers, Phyc. Barbad. 1: pi. 32. 1908. 



On a sandy bottom from near low-water mark down to 30 meters or more. 

 Berry Islands, Bimini, North Cat Cay, Exuma Chain, Caicos Islands, and Castle 

 Island:- North Carolina to Barbados and Panama (Colon). Type from Isles des 

 Saintes, Guadeloupe. 



4. Udotea spinulosa M. A. Howe, Bull. Torrey Club 36: 97. pi. 4. f. S; pi. 8. 



f. 1-7. 1909. 



On a sandy bottom near low-water mark. Bimini (type) : American Virgin 

 Islands (in 30-40 meters, fide Bb'rgesen). 



5. Udotea Wilsoni Gepp & Howe, Siboga Exped. Monog. 62: 130. pi. 7. f. 66; 



pi. 8. f. 67, 68. 1911. 

 On a sandy bottom in shallow water. Anguilla Isles (type) : Florida and Cuba. 



7. HALIMEDA Lamour. Nouv. Bull. Sci. Soc. Philom. 3: 186 (as 



Halimedea*'). 1812. 



OPUNTIA Nacc. El. Ven. 6: 104. 1828. Not Opuntia L. 

 SERTOLARA (Imp.) Nardo, Isis 1834: 673. 1834. 

 BOTRYOPHORA Bompard, Hedwigia 6: 129. 1867. 



Segments reniform, semiorbiculnr, or deltoid-obovate, margins entire or (in H. 

 Opuntia) crenate or sometimes lobed. Nodal filaments of central strand fusing 

 more or less completely in pairs or in threes. 



Afterwards (1816) changed by Lamouroux himself to Halimeda. 



