THE ACTINIANS OF PORTO RICO. 
329 
LIST OF 
Ceriantharia. 
Family Cerianthidx. 
Cerianthus, sp.? 
Zo A NTH ARIA. 
Family Zcxmthidie. 
Subfamily Brachycneminx. 
Zoanthus pulcheUus (Ducliassaing & 
Michelotti). 
Zoanthus sociatus Lesueur. 
Isaurus duchassaingi (Andres). 
Protopalythoa variabilis (Duerden). 
Palythoa caribxa (Ducliassaing & 
Michelotti). 
Actiniaria. 
Order Actinin.®. 
Family Phyllactidx. 
Asteractis expansa Duerden. 
SPECIES. 
Actiniaria — Continued. 
Order Actinin.-k — -Continued. 
Family Bunodactidx. 
Bunodosoma granulifera (Lesueur). 
Bunodosoma spherulata, n. sp. 
Family Sagartidx. 
Subfamily Aiptasinx. 
Aiptasia annulata (Lesueur). 
Subfamily Metridinx. 
Calliactis tricolor (Lesueur). 
Order Stichodactylinje. 
Suborder Homodactylinle. 
Family Stoichactidse. 
Stoichactis helianthus (Ellis). 
Suborder H eterodactylinve. 
Family Phymanthidx. 
Phymanthus crucifer (Lesueur). 
UST OF SPECIES ARRANGED ACCORDING TO LOCALITIES. 
Mayaguez Harbor. — Calliactis tricolor (Les. ); Zoanthus sociatus (Les. ); Zoantlms pulchellus (Duch. & 
Mich.). 
Aguadilla. — Bunodosoma granulifera (Les.); Zoanthus pulchellus (Duch. & Mich. ). 
San Juan Harbor. — Bunodosoma granulifera (Les.). 
Puerto Real. — Asteractis expansa (Duerd. ). 
Guanica Bay. — Aiptasia annulata (Les.); Stoichactis helianthus (Ell.); Zoanthus sociatus (Les.); 
Cerianthus, sp. ? 
Arroyo.- — Stoichactis helianthus (Ell. ) ; Bunodosoma spherulata, n. sp. 
Anoyo. — Stoichactis helianthus (Ell.). 
Playa de Ponce Reef. — Aiptasia annulata (Les.); Bunodosoma granulifera (Les.); Asteractis expansa 
(Duerd.); Phymanthus crucifer (Les.); Zoanthus pulchellus (Duch. & Mich.); Palythoa caribxa 
Duch. & Mich. 
Ensenada Honda, Culebra. — Aiptasia annulata (Les.); Asteractis expansa Duerd. ; Stoichactis helianthus 
(Ell.); Zoanthus sociatus Les. 
Fajardo. — Stoichactis helianthus (Ell.) 
ITucares. — Bunodosoma granulifera (Les.); Protopalythoa variabilis (Duerd.); Isaurus duchassaingi 
(Andres). 
CERIANTHARIA. 
Family CERIANTHIDSE Milne Edwards & Haime. 
Genus CERIANTHUS Delle Chiaje. 
Cerianthus sp. P 
Among the Porto Rican collections is a single specimen of a Cerianthus. The lower extremity is 
torn and the column is slit open for the greater part of its length. The length is now 6.5 cm. and 
the diameter 1 cm.; 38 tentacles occur in the outermost cycle and 35 in the inner. From the external 
characters alone I considered that the form might be the well-known Cerianthus americanus L. Agassiz, 
of the Carolina coasts. A comparison of its histology, however, with that briefly given by McMurrich 
