NARCOMEDUS.E — ^GINURA. 



469 



tacles are inserted higher up on the sides of bell and are longer than the 4 interradial tentacles. 

 The 4 radial tentacles are slightly more than twice as long as the bell-radius, while the 4 inter- 

 radial (undeveloped young ?) tentacles are as long as the bell-radius. The 8 peronial strands 

 are very wide immediately below the base of each tentacle, but become narrower as they 

 approach the lower margin. There are 16 sensory-clubs, 2 upon each marginal lappet. They 

 are elongate, widest at the outer end, and contain about 3 entodermal crystals. The club 

 arises from a marginal sensory pad bearing long bristles, but there are neither sensory tracts 

 nor "otoporpae," on the exumbrella above the clubs. The central stomach is about two-thirds 

 as wide as the disk itself. Peripherally it gives rise to 16 radiating pouches, the 8 adjacent 

 to the 4 long tentacles being wider and almost twice as long as the 8 by the sides of the 4 small 

 tentacles. This may indicate that the medusa is immature. The 8 peronial loop-canals are 

 wide and conspicuous. The mouth is at the extremity of a cylindrical neck, which is half as 

 long as the bell-radius. The lips are 4-lobed, the lobes being in the radii common to the 4 long 

 tentacles. The gonads are developed in the ectoderm of the subumbrella under the 16 

 peripheral outpocketings of the central stomach. 



The medusa exhibits indications of immaturity in the short length of its 4 interradial 

 tentacles and in the small size of the 8 peripheral stomach-pouches on either side of them. 



A single specimen, a male, was found by the Challenger at a depth of 2,150 ( ?) fathoms, 

 south of Australia in the Indian Ocean, on March 10, 1874, lat. 47 25' S., long. 130 32' E. 



Haeckel, 188 1, gives a detailed description accompanied by beautiful figures. 



jEginura lanzerotee Maas. 



Cunoctona lattzerot,c+ C. nausithoc, Hafckfl, 1870, Syst. der Medusen, p. 318, taf. 20, fign. 1-6. 

 .Egirwra lanzcrota:, Maas, 1905, Craspedoten Medusen der Siboga Expedition, Monog. 10, p. 76. 



Bell somewhat flatter than a hemisphere, 15 mm. wide, 5 mm. high. There are 8 semi- 

 circular marginal lappets about half as long as the tentacular radius. 8 stiff, tapering ten- 



Figs. 307 and 308. — JEginuTa "weberi" after 

 Maas, in Hydromedusen Siboga Expe- 

 dition= M. grimaldii. 



tacles, equal in length and somewhat shorter than the bell-radius, project from sides of bell 

 about midway between margin and apex. There are 56 sensory-clubs, 7 upon each of the 8 

 marginal lappets. There are well-developed sensory tracts, or otoporpae, above the sense- 

 clubs, each tract being a spindle-shaped swelling upon the exumbrella and longer than the 



