MEDUSA. 169 



Nectophysa Wyvillei? Haeckel. 



Nectophysa Wyvillei Haeckel, 1888 ; "Challenger" Report, Zool., Vol. XXVIII., p. 327, Plate 23. 



Plate 8, fig. 36. 

 A single specimen of a Siphonophore that we are unable to distinguish 

 from N. Wyvillei was found by us on August 28. The specimen came up 

 attached to the end of a wire rope, which had been lowered to a depth 

 of 500 fathoms. Haeckel's specimens were found at Lanzerote, Canary 

 Islands. The pneumatophore of our specimen is egg-shaped and the 

 pore is situated at its upper apex. The invaginated air-sac hangs free in 

 the general cavity of the pneumatophore, and gives rise at its lower end 

 to a number of finger-shaped villi, which branch sparsely and irregularly. 

 The feeding polypites and tentacles all arise from one side of the stem. 

 The polypites are elongate and flask-shaped and are capable of much 

 contraction or expansion. The mouth is often seen expanded outwards 

 in a trumpet shape. A single tentacle arises from the upper side of each 

 feeding polypite. Simple unbranched tentilla arise at regular intervals 

 from the side of each tentacle. The body of the pneumatophore is clear 

 amber-yellow color, and an iris-like ring, composed of radiating lines of deep 

 brown'pigment, surrounds the pore of the air-sac. The entoderm of the air- 

 sac near the region of the pore is pink in color. The stem and feeding 

 polypites are pink. The main shafts of the tentacles are transparent and the 

 side branches are of a fleshy-pink color. The animal was about 300 mm. in 

 length when expanded, and the pneumatophore was 6 mm. long and 4 mm. 

 in diameter. No gonads were observed. 



Station 3; August 28, 1899; N. Lat. 26° 18', W. Long. 128° 54'. 



Physalia utrieulus Eschscholtz. 



Physalia utrieulus Eschscholtz, F., 1829 ; Syst. der Acal., p. 163, Taf. XIV, Figs. 2, 3. 



Plate 10, figs. 43, U- 



A large number of specimens of this Siphonophore were found by us 

 throughout the Tropical regions of the Pacific. The adult has been well 

 figured by Lesson (1830 ; Voy. de la " Coquille," Zoophytes, PI. V., Fig. I). 1 



i See also Huxley, T. H., 1859 ; Oceanic Hydrozoa, p. 101, PI. X., Figs. l-15 e , PI. XII., Fig. 12. 



