C'ODIACEAE. 613 



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

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



3. Penicillus dumetdsus (Lamour.) Blainville, Man. Aetin. 553. L834. [As 



P. dumetosa.] 



Neiea dumetosa Lamour. Hist. Polyp. 259. 1816. 

 Cordllocephaius dumetosus Kiitz. Sp. Alg. 506. 1849. 

 CoraUocephalus affiwis Kiitz. Tab. Phyc. 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. f. 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. 1S43; Phyc. Gen. 311. 1S43. 



Filaments of capitulum 55-00 /j. in diameter toward apices, rather firmly and per- 

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



Filaments of capitulum 100 230 u 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. cir. 



Corallina Phoenix Ell. & Soland. Xat. 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. 1S49. 



Penicillus oblongus Decaisne, Ann. Sci. Xat. Bot. II. 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 Penicillin 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. Sei. Soc. Philom. 3: 1S6. IS! 2. 



Flabellum with a compact, firm, highly specialized cortex, 



distinctly zonate. I. U. Flabellum. 



Flabellum with an imperfect rudimentary cortex or none 

 at all. 

 Filaments of flabellum withoul lateral appendages, each 

 filament enclosed in a porose calcareous sheath. 

 Flabellum plane; transition from stipe to flabellum 

 gradual: filaments of flabellum 28 <'>" u. in diam 

 eter, Interwoven and tortuous, usually forming a 

 superficial tomentulose nap: branches of the cor- 

 ticating filaments of the stipe somewhal loosely 

 ami Irregularly fastigiate, tin- ultimate divisions 



mostly finger-shaped, subacute <<r taper pointed. 2. V. oongluttoata. 



Flabellum more or less cyathiform, or open on one 

 side ami almost plane (then usually a little concavo- 

 convex, at least at basei ; transition from stipe to 

 flabellum abrupt ; filaments of flabellum nearly 



