72 BULLETIN : MUSEUM OF COMPAKATIVE ZOOLOGY. 



PORPITA, Lamakck, 1816. 



Porpita Linnseana, Lesson. 



Porpita Liauseana, Lesson, R. P., 1843, Hist. Nat. des Zooph. AcaL, p. 588. 



This Siphonophore is met with occasionally at the Tortugas, Florida. It often 

 occurs in vast swarms, which appear at irregular intervals, all along the coast 

 of the United States from the Tortugas to North Carolina. A single specimen 

 was found by A. Agassiz, in Newport Harbor, Rhode Island, in 1875. 



RHIZOPHYSA, P^KON and Lesueur, 1809. 

 Rhizophysa Murrayana, Chun. 



Rhizophysa filiformis ? Gegenbaur, C, 1854, Zeit. f iir Wissen. ZoiJl., Bd. V. p. 324, 



Taf. XVIII. Figs 5-11. 

 Cannophysa Murrayana, Haeckel, E., 1888, Siphonophorae, Challenger Report, Zool., 



Vol. XXVIII. p. 324, PI. XXIV. Figs. 1-9. 

 Cannophysa Eysenhardtii, Mayer, A. G., 1894, Bull. Mus. Comp. Zoul. Harvard 



ColL, Vol. XXV. p. 239, PI. III. Figs. 1, 2, 4. 

 Rhizophysa Murrayana, Chun, C , 1897, Sipiionophoren der Plankton Expedition, 



p. 84. 



This Siphonophore has been found by us among the Bahama Islands and off 

 the Cuban coast, and a single damaged specimen was obtained at the Tortugas, 

 Florida. It has been obtained by Haeckel, 1888, at the Canaries, and by 

 Chun, 1897, in the Tropical Atlantic. The Mediterranean species R. filiformis 

 of Gegenbaur, 1854, is certainly very closely allied; if not identical with the 

 Atlantic form. 



Rhizophysa Eysenhardtii, Gegenbaur. 



Rhizophysa filiformis, Huxley, T. H., 1859, Oceanic Hydrozoa, p. 90, PI. VIII. Figs. 



13-20. 

 Rhizophysa Eysenhardtii, Gegenbaur, C, 1859, Nova Acta Acad. Nat. Curios., 



Tom. 27, p. 408, Taf. 31, Fig. 46-49. 

 Nectophysa Wyvillei, Haeckel, E., 1888, Siphonophorae, Challenger Report, Zool., 



Vol. XXVIII. p. 327, PI. XXIII. Figs. 1-8. 



This Siphonophore is found occasionally at the Tortugas, Florida. It has 

 been obtained by Haeckel in the Canary Islands, by the Plankton Expedition 

 in the Sargasso Sea, and by Fewkes in the Bermudas. 



Rhizophysa clavigera, Chun. 



Cannophysa filiformis, Mayer, A. G., 1894, Bull. Mus. Comp. Zool. at Harvard 



Coll., Vol. XXV. p. 241, PI. III. Fig. 3. 

 Rhizophysa clavigera, Chun, C, 1897, Siphonophoren der Plankton Expedition, p. 



104. 



A single specimen of this Siphonophore was found floating within ten metres 

 of the surface in the Gulf Stream between Havana and Key West. 



