CODIACEAE. 613 



Mariguana, Caicos Islands, Castle Island, and Great Ragged Island : Florida, Cuba, 

 Jamaica, Porto Rico, and American Virgin Islands. Type from Bahama Islands. 



3. Penicillus dumetosus (Lamour.) Blainville, Man. Actin. 553. 1834. [As 



P. dumetosa.} 



Newa dumetosa Lamour. Hist. Polyp. 259. 1816. 

 Corallocephalus dumetosus Kiitz. Sp. Alg. 506. 1849. 

 Corallocephalus affinis Kiitz. Tab. Phye. 8 : 13. pi. 30. 1858. 



On sandy or muddy bottom, mostly in shallow water. Long Bank, Great 

 Bahama, and Bimini : Florida to Guadeloupe. Type from " Antilles." 



4. Penicillus pyriformis A. & E. 8. Gepp, Jour. Bot. 43: 1. pi. 468. f. la, 11. 



1905. 



On a sand bottom in shallow water, common. New Providence, Rose Island, 

 Berry Islands, Andros, Great Bahama, Bimini, Exuma Chain, Cat Island, Watling's 

 Island, Mariguana, Caicos Islands, and Anguilla Isles : Bermuda and Florida to 

 Jamaica and Guadeloupe. Type from Bimini Harbor, Bahamas. 



5. RHIPOCEPHALUS Kiitz. Linnaea 17: 95. 1843; Phyc. Gen. 311. 1843. 



Filaments of capitulum 55-90 ^ in diameter toward apices, rather firmly and per- 

 sistently coherent, in always easily recognizable flabella. 1. P. Phoenix. 



Filaments of capitulum 100-230 w in diameter toward apices, 

 lightly and transiently coherent, the flabella scarcely recog- 

 nizable at maturity. 2. P. oblongus. 



1. Rhipocephalus Phoenix (Ell. & Soland.) Kiitz. loc. cit. 



Corallina Phoenix Ell. & Solancl. Nat. Hist. Zooph. 126. pi. 25. f. 2, 3. 

 1786. 



On sandy or gravelly bottom or on rocks, mostly in shallow water. New Provi- 

 dence, Rose Island, Berry Islands, Andros, Bimini, Exuma Chain, Cat Island, At- 

 wood Cay, and Mariguana : Florida, Cuba, Jamaica, Porto Rico, and Guadeloupe. 

 Type from the Bahama Islands. 



2. Rhipocephalus oblongus (Decaisne) Kiitz. Sp. Alg. 506. 1849. 



Penicillus oblongus Decaisne, Ann. Sci. Nat. Bot. II. 18: 109. 1842. 



On sandy bottom in shallow water, not common. New Providence, Berry 

 Islands, Bimini, and North Cat Cay : Florida and Cuba. Type from the Bahama 

 Islands. 



Often resembling certain conditions of Penicillus capitatus, but usually recog- 

 nizable, at least in living or fluid-preserved states, by the more flabelliform arrange- 

 ment of the filaments of the capitulum and by the presence of a cup-shaped apical 

 depression. 



6. UDOTEA Lamour. Nouv. Bull. Sci. Soc. Philom. 3: 186. 1812. 



Flabellum with a compact, firm; highly specialized cortex, 



distinctly zonate. 1. U. Flabellum. 



Flabellum with an imperfect rudimentary cortex or none 



at all. 

 Filaments of flabellum without lateral appendages, each 



filament enclosed in a porose calcareous sheath. 

 Flabellum plane ; transition from stipe to flabellum 

 gradual ; filaments of flabellum 28-60 //, in diam- 

 eter, interwoven and tortuous, usually forming' a 

 superficial tomentulose nap ; branches of the cor- 

 ticating filaments of the stipe somewhat loosely 

 and irregularly fastigiate, the ultimate divisions 



mostly finger-shaped, subacute, or taper-pointed. 2. U. conglutinata. 



Flabellum more or less cyathiform, or open on one 

 side and almost plane (then usually a little concavo- 

 convex, at least at base) ; transition from stipe to 

 flabellum abrupt ; filaments of flabellum nearly 



