BY R. VON LENDENFELD, PH.D. 303 



diameter of the Umbrella, between the suctoral crisps of their 

 wings there are numerous three-cornered gallert clubs, of the same 

 shape as the larger terminal knot of each arm. 



Size : Breadth of Umbrella, 120 mm. Height of Umbrella, 

 40 mm. 



Locality : Indian Ocean, Madagascar. Levasseur. 



Genus. Thysanostoma. 



Crambessidse with weak, shortened and mostly coalescent 

 upper arm, and strap-shaped, very elongated, three-cornei'ed, 

 prismatic under arm, the three narrow wings possess suctorial crisps 

 in their whole length, without terminal knot. 



Species. Thysanostoma thysanura. 



Haeckel, System der Medusen. Seite, 625. 



Umbrella nearly orbicular, 2-3 times as broad as high with 96 

 marginal flaps (in each Octant 10 truncate rounded velar flaps 

 between two pointed three-cornered ocular flaps.) Exumbrella 

 polygonal, slabbed with irregular and granulated slabs, which 

 are scarcely half as broad as the marginal flaps. Sub-genital ostia 

 4-6 times as bi'oad as the pillars. Arms 2-3 times as long as the 

 diameter of the Umbrella, very narrow, ribbon shaped, thi*ee- 

 winged, the same breadth nearly throughout their whole length to 

 the rounded end. 



Size : Breadth of Umbrella, 8 mm. Height of Umbrella, 3 mm. 



Locality : Australia, Museum. Godeffroy. 



Species. Thysanostoma melitea. 



Haeckel, System der Medusen. Seite, 626 



Melitea brachyura. Lesson, 1830. Centurie Zoologique, p. 227, 

 pi. 80. 



Rhizostoma brachyura. Lesson, 1829, Voyage de la Coquille, 

 Zoopht., Tom. II., p. 120. 



%AA 



