438 



MEDUSAE OF THE WORLD. 



The flat, conical stomach is as wide as the thick central disk and the mouth is a simple, 

 round opening at about the level of the velum. The gonad is a wide, swollen ring in the ecto- 

 derm of the subumbrella wall around the periphery of the stomach. 



The gonad, tentacles, and nettle-cells along the margin of the lappets are sky-blue; the 

 tentacle-tips being deep blue. 



Found in the Red Sea, tropical Pacific, Indian, and Atlantic Oceans. 



Solmaris lenticula Haeckel. 



Solmaris lenticula, Haeckel, 1879, Syst. der Medusen, p. 357. 



Bell biconvex, lenticular, 5 mm. wide, 3 mm. high. There are 16 tentacles somewhat 

 longer than the bell-diameter. The marginal lappets are semicircular and not quite half as 

 long as the diameter of the stomach. There are 3 sensory-clubs upon each lappet-margin. 

 The gonad appears as a wide annulus upon nearly the entire subumbrella wall of the stomach. 

 Found in the Indian Ocean. Probably only an immature form. 



Solmaris multilobata Maas. 



Solmaris multilobata, Maas, 1893, Ergeb. der Plankton Exped., Bd. 2, K. c, p. 45, taf. 4, fign. 7-13. — Vanhoffen, 1908, 

 Narcomedusen der Valdivia Expedition, p. 61. 



Bell flat, the shape of a biconvex lens, 12 to 18 mm. wide. About 70 slender, thread-like, 

 solid tentacles, 2 to 3 times as long as the bell-diameter. Alternating with the tentacles are an 

 equal number of short, blunt, marginal lappets, each bearing a club-shaped sense-organ on the 



Fig. 290. — Solmaris multilobata, after Maas, in Ergeb. der Plankton Expedition. 



exumbrella nerve-ring. The axial cells of these clubs are entodermal and there is a single 

 concretion in each club. The velum is not wide and spans the spaces between the lappets. 

 The flat and lens-shaped stomach underlies the entire subumbrella surface. Mouth wide and 

 circular. The gonad is a simple annulus in the ectodermal wall of the subumbrella. North 

 of the Hebrides, Scotland. It is distinguished by its very numerous, thread-like tentacles. 

 The Valdivia found 24 specimens of this medusa on August 8 and 9, 1898. This form 

 may prove to be identical with Solmaris corona. 



