MEDUSAE. 145 



radial canal, aud eight large marginal bulbs, one midway between every two tentacles. 

 A few of these bulbs are just beginning to develop tentacles. The tentacles are long 

 and slender, and their basal bulbs are somewhat globular. The excretory papillae are 

 plainly visible, and project out just above the velum. All the basal bulbs and the 

 small marginal bulbs have excretory pores. The small marginal bulbs are more or 

 less conical in shape, and some look as if they were capable of developing tentacles. 



I place this species provisionally in the genus Octocanna, as it does not possess 

 all the characters according to Haeckel's definition. There are two species of 

 Octocanna, both of which were described, without figures, by Haeckel, and have 

 not since been recorded. 



Octocanna octonema has 8 tentacles. Gonads reaching along the whole length 

 of the radial canals. Sixteen sense-organs, each with a single otolith. Umbrella 

 10 millims. in diameter. Red Sea. 



Octocanna polynema has 32 tentacles. Gonads not along the whole length of the 

 radial canals. 60 to 80 sense-organs, each with two otoliths. Umbrella 15 millims. 

 in diameter. Singapore. 



Both the above species have four very long oral lips, which Haeckel includes in 

 the generic characters. The Ceylon specimens have eight small lips. They also 

 possess marginal bulbs and excretory pores which are not mentioned by Haeckel. 



[In the report upon the Hydromedusse of the "Siboga" Expedition, Professor Maas 

 describes under the name of Octocanna polynema, Haeckel, some medusae which 

 appear to me to be identical with the specimens in the Ceylon collection. These 

 specimens I had described in manuscript as a new species of Octocanna. As Maas 

 has emended Haeckel's description and transfers the genus from the ^Equoriidse to the 

 Eucopidae, he has prevented me from introducing a superfluous new species. I quite 

 agree with him as to the desirability of the removal of the genus to the Eucopidae and 

 have adopted the classification here.] 



Family : JEQUORIIDJE, Eschscholtz, 1829. 



iEquorea, Peron et Lesueur, 1809 ; ex Browne, 1904. 



/Equoriidae with numerous simple unbranched radial canals. Stomach circular, with 

 the lower wall fully developed. Mouth capable of closing up. 



iEquorea conica, n. sp. Plate I., fig. 2 ; Plate II., figs. 16, 17, 18. 



Description. Umbrella somewhat cone-shaped, with a rounded summit, a little 

 higher than broad, and very thick. Velum narrow. Stomach flat and circular, 

 about half the diameter of the umbrella. Oral lips about 16 in number, long and 

 slender. About 16 radial canals. Gonads upon the proximal half of the radial 

 canals, very much laterally compressed. Tentacles about 26 to 30, small and slender ; 

 their basal bulbs small and somewhat cone-shaped, Between every two tentacles a 



U 



