Key to t h e sp 

 1. Plant distinctl) differentiated into stipes and capitulum (Pent- 



\ ( laments of capitulum nol continuously 



moniliforni i \ are West Indian 



Filaments <>t capitulum 400 — Soo fi or more in diam., 

 calcified, about as |. stipes, spreading. 



• stipes caespitoso-papillose under microscope. 1. /'. dumetosus (p. 76). 

 Filaments of capitulum 300 — 500 u. in diam., calcified, 

 short, erect. Stipes compressible, flattened; surface 



pseudoporose under microscope 2. /'. Lamourouxü (p. 7 



Filaments of capitulum 100 — 300^., calcified, crowdcd. 



Stipes terete, hard: surface niinutely pseudoporose . 3. /'. capitatus (p. 81). 

 Filaments of capitulum [50 — 200 u. in diam., calcified, 

 interlaced; capitulum pyriform. Stipes usually short, 

 rough', wrinkled, with surface caespitoso-papillose; under 



microscope 4. P. pyriformis (p. 85). 



Filaments of capitulum 160 — 200 /jt, calcified. Mediter- 



ranean). Stipes with surface minutely pseudoporose. 6. /'. mediterraneus (p. . v ; 

 H Constrictions of filaments of capitulum continuously monili- 

 form below, of varying length aböve. Indian Ocean). Stipes 



with surface uneven, spumosely pseudoporose .... 5. P. nodulosus (p. S6). 

 II Plants not differentiated into stipes and capitulum. {Espera). 

 Ascending filaments 100 — 1 20 u, caespitose. Mediter- 



ranean) , . 6. State of /'. mediterraneus. 



Ascending filaments 90 — 140 a. (Malay Archipelago). 7. P. Sibogae (p. S9). 



1. Penicillus dumetosus Blainville \ a dumetosa' , \ 



Manuel d'Actinologie. 1 S34. p. 553. 

 Syn. Nesea dumetosa Lamouroux Hist. Polyp. Corall. flex. 1816. p. 259, tab. VIII, \v^. 3 [male depicta]. 

 ■ buisson Blainville in Nouv. Dict. d'Hist. Nat. XXII. [818. p. 583. 

 ea dumeh ■ Deslongchamps in Encyclopéd. Méthodique, Zoophyt. [824—5. p. 5 

 Nesea dumetosa Blainville in Dict. Sci. Nat. XXXIV. 1S25. p. 493. 



Penicillus dutneti Decaisne Mem. Corallines in Ann. Sci. Nat. sér. 2. XVIII. 1S42. p. 109. 



Penicillus dumetosus Endlicher Mant. Bot. Gen. Plant. Suppl. III. [843. p. [8. 



xllocephalus dumetosus Kützing Spec. Alg. [849. ]>. 506. 

 Penicillus <lu»: Harvey Nereis Bor.-Amer. III. 1857. p. 44. tab. 53, A. 



rallocephalus Lamourouxü Kützing Tab. Phyc. VIII. [858. p. 13, tab. 29, fig. 1 (non Spec. 

 -\f 

 Corallocephalus affinis Kützing Tab. Phyc. VIII. 1858. p. 13, tab. 30. 

 Penicillus longiarticulatus Crouan in Ma/c et Schramm Algues de la Guadeloüpe, Ed" II. 



-77- I' 

 Penicillus clavatus Crouan in Ma/r et Schramm, .loc. cit. p. 91. 



Penicillus dumetosus Farlow in Proc. Amer. Ac, ui. X. 1875 p. 378; U. S. ImsIi Comm. 

 Report III p. 712. 



