EUDENDRIUM. 159 



all over the stem, resembling in this respect very strikingly the Peri- 

 gonimus of Sars, to which the Ilydrarium also bears a close affinity, 

 from the size of its sterile Polypes. 



Charleston Harbor (McCrady); Buzzard's Bay, Naushon (A. Agassiz). 



Cat. No. 43, Naushon, Mass., Sept. 1861, A. Agassiz. Hydrarium. 



Cat. No. 437, Naushon, Mass., 18G4, A. Agassiz. Medusa. 



EUDENDRIUM Ehrenb. 



Eudendriwn Ehrenb. Corall. d. Roth. Meeres. 1834. 

 Eudendrium Agass. Cont. Nat. Hist. U. S., IV. p. 342. 1862. 

 Calamella Oken'. Lehrb. der Naturg. Gesch. 1815. 

 Thoa Lamx. Pol. Cor. Flex. 1816. 



Eudendrium dispar Agass. 



Eudendrium dispar Agass. Cont. Nat. Hist. U. S., IV. pp. 285, 289, 342, Fig. 36 ; PI. 27, Figs. 



10-21. 1862. 

 Thoa dispar Agass. Cont. Nat. Hist. U. S., IV. PI. 27, Figs. 10-16. 1862. 



This Hydroid (Fig. 249) is closely allied to the ^'^•^'• 



Tuhxdaria ramea of Dalyell and the Coryne jm- 

 silla var. muscoides of Johnston. The male and 

 female communities are readily recognized by the 

 different color of the Medusae buds ; the male Me- 

 dusjB buds are bright orange, while the females 

 are of a dull pink. 



Massachusetts Bay (Agassiz). 



Cat. No. 34, Nahant, Mass., Sept. 1854, H. J. Clark. Hydrarium. 



Cat. No. 35, Suisconset, Mass., July, 1849, L. Agassiz. Hydrarium. 



Cat. No. 36, Nahant, July, 1861, A. Agassiz. Hydrarium. 



Cat. No. 37, Nahant, July 11, 1861, A. Agassiz. 



Cat. No. 38, Naushon, Mass., September, 1861, A. Agassiz. 



Cat No. 405, Nahant, June, 1862, A. Agassiz. Hydromedusariimi. 



Cat. No. 423, Eastport, Me., A. E. Verrill. 



Museum Diagram No. 23. 



Fig. 249. Female Meduste buds in different stages of development. 



