PHYSALIA ARETHUSA. 215 



of Hydra3 and of Medusai (Figs. 352, 353, 354) are introduced 

 liere. 



Fig. 352. 



Fig. 303. 





p5 



Fie. 354. 



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

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

 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. Lat., 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 Ilydra^, and clusters of Medusae, of Physalia Arethusa Til. h, h, 

 Hydrae, with their tentacles, c, c ; d, rl, bunches of tentacles. 



Fig. 353. Bunch of Hydi-ae. «, hollow base of attachment communicating with air-sac ; 6, h, b, 

 single Hydrae ; c, c, tentacles. 



Fig. 354. Bunch of jNIedusae in various stages of development, a, hollow base of attachment : 

 h, Ilydi-a ; d, d, Medusse buds. 



