The Actiniae of the Plate Collectiou. 235 



feeble, iiideed, in some individuals it can hardly be said to be 

 developed. 



I am able to confirm Caelgren's Observation tliat both octamer- 

 ous and hexamerous individuals occiir, since I found both arrange- 

 ments in the specimens from Punta Arenas; the Single individual 

 from Cabo Espiritu Santo was hexamerous. In the hexamerous forms 

 the mesenteries are arranged in three cj^cles, all of Avhich are per- 

 fect, although the members of the tliird cycle are very much nar- 

 rower in the lower part of the column than are the others. In the 

 octamerous individuals only sixteen pairs of mesenteries were present, 

 and of tliese eight pairs were very much smaller than the others. 

 It would seem that the eight primary pairs of the octamerous 

 arrangement are to be regarded as equivalent to the twelve pri- 

 maries and secondaries of the hexamerous individuals. I have not 

 found any evidence that the octamerous condition is merely trans- 

 itory, as Carlgren supposes, and while I am not disposed to deny the 

 occurrence of a transformation of one condition into the other in 

 the face of my colleague's deflnite Statements, I would point out 

 that the occurrence of both arrangements in individuals of the same 

 species is not without precedent. 



In the "illbatross" specimen which I examined reproductive 

 elements occurred only in the primary (octamerous) mesenteries, 

 with the exception of the directives. In individuals of the present 

 collection I find them also in the secondaries (tertiaries of the hexamer- 

 ous arrangement) and have observed them in one individual in one 

 of the pairs of directives, so that Carlgren is probably correct 

 when he describes all the mesenteries, including the directives, as 

 being fertile. 



5. Parantheox^sis ocellata (Lesson). 



Actinia ocellata Lesson, 1828. 



Cribrina ocellata Ehrenberg, 1834. 



Crihrina (DiplostepJianus) ocellata Brandt, 1835. 



Cereus{?) ocellata Milne-Edwards, 1857, 



Bunodes ocellata Yerrill, 1869. 



Bunodactis ocellata Verrill, 1899. 



Nr. 61. Cavancha near Iquique. 1 specimen. 



154. Tumbes near Talcahuano. 12 specimens. 



219. Puerto Montt. 5 specimens. 



256a. Calbuco, 3 specimens. 



