74 



bulletin: museum of comparative zoology. 



single specimen of its sexual generation (Diplophysa ineriuis) was found by 

 Fewkes (1881 ; Bull. Mus. Comp. ZobL, Vol. VIII. p. 166, Plate VI. Figure 

 12), in Newport Harbor, Rhode Island. 



Tlie Atlantic species of Sphseronectes is closely allied to, if not identical 

 with, S. Kbllikeri of the Tropical Pacific. Chun (1892, Abhandl. Senck. 

 Gresell., Bd. 18, p. 86) says that in S. KoUikeri the distal portion of the 

 phyllocyst curves downward toward the edge of the swimming-bell, while 

 in S. gracilis it bends upwards. Our observations on S. KoUikeri from the 

 Fiji Islands do not support this view (see Agassiz and Mayer, 1899 Bull. 

 Mus. Camp. Zool. at Harvard Coll., Vol. XXXII. p. 177, Plate 16, Figure 51), 

 for there appears to be much individual variability in respect to the curvature 

 of the phyllocyst in the Pacific species. All of the specimens of S. gracilis 

 observed in the Tortugas, Florida, were colorless, whereas S. KoUikeri is often 

 quite highly colored ; the entoderm of the feeding-polypites being bright yel- 

 low, and the nematocyst batteries of the tentacles orange. 



5 DIPHYES, CoviER, 1817. 



I EUDOXIA, EscnscHOLTz, 1825. 



Polygastric 

 Generation 



( Diphyes bipartita, Costa. 



( Eudoxia campanula, Ledckart. 



Figs. 114, 114'^, Plate 34. 



Diphyes bipartita, Costa, O. G., 1840, Genere Diphya, p. 4, Taf. 



IV. 

 Diphyes acuminata, Leuckart, R., 1853; Die Siphonophoren, p. 01, 



Taf. III. Figs. 11-19. 

 Diphyes gracilis, Gegenbaur, C, 1854, Zeit. fiir Wissen. Zool., 



Bd. V. p. 309, Taf. XVI. Figs. 5-7. 

 Diphyes Sieboldii, KuUiker, A., 1853, Die Schwirampolypen der 



Messina, p. 36, Taf. XI. Figs. 1-8. 



This species is very abundant all over the Tropical Atlantic and in the 

 Mediterranean ; and specimens are often found at Newport, Rhode Island, 

 late in the summer. 



