VELELLA SEPTENTRIONALIS. 217 



brilliant ochre color. Professor Ajjassiz has observed this Medusa four 

 days after it became free, when the Medusa had become quite globu- 

 lar, having lost entirely its elongated shape. 



Long Island Sound (A. Agassiz) ; Gulf of Mexico (Bosc) ; Coast of 

 Florida (L. Agassiz). 



Cat. No. 206, Florida, 1850, L. Agassiz. 



Cat. No. 297, Fort Jefferson, Fla., April, 1859, Dr. D. W. Whitehurst. 



Cat. No. 298, Key West, Fla., March, 1858, J. E. Mills. 



Cat. No. 299, Cape Florida, April, 1858, G. Wurdeman. 



Cat. No. 300, Cape Florida, G. Wurdeman. 



Cat. No. 301, Tortugas, Fla., April 2, 1858, L. Agassiz. 



Cat. No. 302, Tortugas, Fla., April, 1858, J. E. Mills. 



Museum Diagram, No. 27, after L. Agassiz. 



Velella septentrionalis Esch. 



Velella septentrionalis EscH. Syst. der Acal., p. 171, PI. 15, Fig. 1. 1829. 



Numerous specimens were collected at the entrance of the Straits 

 of Fuca. The proportions of this species are quite different from 

 those of our West Indian V. mufica. The figure given by Eschscholtz 

 gives a good idea of the almost square outline of the float. 



In company with V. sejjteiitrionalis was always found a Physalia, 

 which I have been unable to refer to any of the described species. 

 As the specimens of both were lost, they are mentioned here for the 

 sake of the geographical distribution of these animals. 



Northwest coast of America (Eschscholtz) ; Straits of Fuca (A. Ag- 

 assiz, October, 1859) ; San Francisco Bar (A. Agassiz, October, 1859). 



KO. II. 28 



