150 EXPEDITION OF THE "ALBATROSS," 1899-1900. 



tentacles are solid, and are interradial in position. Their centrifugal sides 

 are studded with about six to ten wart-like, neinatocyst-bearing swellings. 

 These tentacles are about as long as the bell-radius, and are carried curled 

 stiffly upwards. There are twelve otocysts, one at the base of each tentacle. 

 Each otocyst is hollow and contains a single spherical otolith. There are 

 six broad, flat, radial canals, upon the mid-regions of which the gonads are 

 developed. In addition to the radial canals there are eighteen blindly 

 ending centripetal canals, three between each successive pair of radial 

 canals. Six of these centripetal canals are longer than the others, and 

 extend about half the distance from the bell-margin to the base of the 

 stomach. The circular canal is wide and flat. The velum is well developed. 

 The proboscis is long and pyriform, and the mouth projects beyond the level 

 of the velar opening. The mouth is situated at the extremity of a long 

 narrow neck, and there are six short, slightly recurved lips. The entoderm 

 of the medusa is of a delicate rosy-pink, and all other parts are colorless. A 

 single specimen was found in a surface haul made south of the Marquesas 

 Islands. 



S''; Station 31 ; September 19, 1899 ; S. Lat. 12° 20', W. Long. 144° 15'. 



Aglaura prismatica Maas. 



Aglaura prismatica Maas, 1897; Mem. Mus. Comp. Zool., Vol. XXTIL, No. 1, p. 24, PI. 

 III., Figs. 4, 5. 



We first obtained this medusa in N. Lat. 12 c 7', W. Long. 137° 18' ; and 

 thereafter it became one of the commonest objects in the tow. Large num- 

 bers were obtained among the Marquesas and Society Islands, and in 1897 

 we found it to be abundant among the Fiji Islands. 1 It was discovered in 

 considerable numbers by the "Albatross" off the west coast of Mexico and 

 Central America in 1891, and it seems safe to conclude that it is widely 

 distributed over the tropical regions of the Pacific. 



S J ; Station 12 ; September 4, 1899 ; N. Lat. 12° 07', W. Long. 137° 18'. 

 S''; " 13; " 5, " " 9° 57', " 137° 47'. 



S"; " 15; " 8; " 4° 35', " 136° 54'. 



(300 f — S)"; " 25; " 14 ; Marquesas Islands. 



S" ; " 73 ; October 5 ; S. Lat. 17° 27', W. Long. 149° 32'. 



S" ; November 1 7 ; off Bora Bora Island, 'Society Islands. 



1 Bull. Mus. Comp. Zool., Vol. XXXII., p. 1G5, PI. 4, Fig 13. 



