PHYSALIA ARETHUSA. 



215 



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

 here. 



Fig. 352. 



Fig. 353. 



Charleston (McCrady) ; Gulf of Mexico (Bro^vn, 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, 1801, 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. Bunclv of single Hydra>, and clusters of Medusae, of Physalia Arcthusa Til. h, b, 

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



Fig. 353. Bunch of Ilydrae. a, hollow base of attachment communicating with air-sac ; b, h, b, 

 single Hydrae ; c, c, tentacles. 



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

 b, Hydra ; (/, d, ^Medusa; buds. 



