CODIACEAE. 613 



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

 Jamaica, Porto Rico, and American Virgin Islands. Type from liabama Islands. ' 



3. PenicUlus dumetosus (Lamour.) Blainville, Man. Actin. "/i. ls:i4. [As 



P. dumetosa.] 



Ne^ca dumetosa Lamour. Hist. Polyp. 259. 1816. 

 CoraUocephahis 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. S. Gepp, Jour. Bot. 43: 1. pi. 468. /. la, lb. 



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 alwaj's easily recognizable flabella. 1. P. I'hocnix. 



Filampiits of capitulum 1 00-230 u in diameter toward apices, 

 lightly and transiently coherent, the flabella scarcely recog- 

 nizable at maturity. 2. P. ohlongus. 



1. Rhipocephalus Phoenix (Ell. &: Soland.) Kiitz. loc. cir. 



Corallina Phoenix Ell. & Soland. Xat. Hist. Zooph. 126. /<?. 25. f. 2, S 



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. 



Fenicillus oblongus Decaisne, Ann. Sci. Nat. Bot. IT. 18: 109. 1S42. 



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 PenicUlus 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. Xouv. Bull. Sci. Soc. Philoni. 3: ISO. 1812. 



Flabellum with a compact, firm, highly specialized cortex. 



distinctly zonate. 1- 1. I'luf" Hum. 



Flabellum with an imperfect rudimentary cortex or none 

 at all. 

 Filaments of flabellum without lateral appendages, each 

 filament enclosed in a p^rose calcareous sheath. 

 Flabellum plane: transition from stipe to flabellum 

 gradual ; filaments of flabellum 'JS-Oo ^ in diam- 

 eter, interwoven and tortuous, usually forming a 

 superficial tomeutulose nap ; branches of the cor- 

 ticating filaments of the stipe somewhat loosely 

 and irregularly fastigiate, the ultimate divisions 



mostly finger-shaped, sui)acute, or taper-pointed. 2. U. couplutinata. 



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 



