PHYSALIA ARETHUSA. 



215 



of Hydrae and of Medusa? (Figs. 352, 353, 354) are introduced 

 here. 



Fig. 352. 

 Fig. 353. 



Charleston (McCrady) ; Gulf of Mexico (Brown, Sloane) ; Florida 

 (L. Agassiz) ; Cape Cod (A. Agassiz) ; Martha's Vineyard (W. H. 

 Forbes). 



Cat. No. 305, Florida, 1850, L. Agassiz. 



Cat. No. 306, Florida, 1850, L. Agassiz. 



Cat. No. 307, Florida, 1850, L. Agassiz. 



Cat. No. 308, Key West, Fla., February, 1858, L. Agassiz. 



Cat. No. 309, Key West, Fla., March, 1858, L. Agassiz. 



Cat. No. 310, Tortugas, Fla., February, 1858, L. Agassiz. 



Cat. No. 311, New Providence, Bahamas, April, 1861, F. G. Shaw. 



Cat. No. 312, Mobile, Alabama, L. Agassiz. 



Cat. No. 313, 40 N. Lai, 60 W. Long., Captain W. H. A. Putnam. 



Cat. No. 314, Naushon, Mass., 1861, W. H. Forbes. 



Cat. No. 325, Tortugas, Fla., March, 1858, L. Agassiz. 



Cat. No. 385, Beaufort, N. C., May, 1863, A. S. Bickmore. 



Cat. No. 386, Bermudas, A. S. Bickmore. 



Museum Diagram, No. 28, after L. Agassiz. 



Fig. 352. Bunch of single Hydrae, and clusters of Medusae, of Physalia Arethusa Til. ft, &, 

 Hydras, with their tentacles, c, c ; d, d, bunches of tentacles. 



Fig. 353. Bunch of Hydra, a, hollow base of attachment communicating with air-sac ; b, 1, 5, 

 single Hydrae ; c, e, tentacles. 



Fig. 354. Bunch of Medusas in various stages of development, a, hollow base of attachment ; 

 I, Hydra ; d, d, Medusa} buds. 



