166 EXPEDITION OF THE "ALBATROSS," 1S99-1900. 



highly vacuolated, reticulated cells ; and contains several small " oil glob- 

 ules." The gelatinous substance of the animal is of a translucent milky 

 color, the entoderm of the polypites being somewhat more opaque. In 

 one of our specimens the pbyllocyst was milky, while in the other it was 

 of a decided green color. This form is evidently quite closely related to 

 Abyla carina (Haeckel 1888 ; Siphonophorce, " Challenger " Eeport Zobl., 

 Vol. XXXVIII., PI. 35) of the Tropical Atlantic. 



S^ ; Station 27 ; September 15, 1899 ; off Marchand Island, Marquesas. 

 S"; " 32; " 20, " S. Lat. 13° 37', W. Long. 145° 42'. 



Abyla Huxleyi Haeckel. 



Abyla pentagona Huxley, T. H., 1859 ; Oceanic Hydrozoa, p. 40, PL II., Figs. 2-2 e . 

 Calpe Huxleyi Haeckel, E., 1888; Siphonopbora;, "Challenger" Report, Zobl., Vol. 

 XXVIII., p. 164. 



Plate 11, fig. 48. 



A number of specimens of the tropical Pacific form of Abyla were found 

 by us at various places during the cruise through the warm regions of the 

 ocean. The Pacific species is certainly very close to, if not identical with, 

 the Atlantic form (see Calpe Gegenbauri, Haeckel, 1888 ; p. 164, Pis. 

 XXXIX., XL.). The remarkable range of individual variability in different 

 specimens, and the great difference which arises with successive stages of 

 growth, renders it extremely difficult to decide whether the Atlantic and 

 Pacific forms be identical or not. The only difference which seems to be 

 fairly constant is that in the Pacific form the entoderm of the feeding poly- 

 pites is usually milky in color, whereas in the Atlantic form it is generally 

 of a more or less decided green. The Pacific species attains a length of 

 about 25 mm. We give a figure drawn from an individual obtained near 

 Rongelab Atoll, Marshall Islands. Other specimens were obtained in the 

 Marquesas, Paumotus, Society, and Ellice Islands. 



S''; September 15, 1899 ; Tai-o-hae, Marquesas Islands. 



(300 f — S)''; Station 32; " 20, " S. Lat. 13° 37', W. Long. 145° 42'. 



S n ; November 17, " off Bora 15ura Island, Society Islands. 



S"; ■ December 24, " Lagoon of Funafuti, Ellice Islands. 



(150 f — S)'; January 17, " off Rongelab Atoll, Marshall Islands. 



