32 DESCRIPTIVE CATALOGUE. 



Genus THYSANOSTOMA. L. Agassiz, 1862. 



Tlie threo narrow wings of the under-arm possess suctorial crisps throughout 

 their entire length. 



TlIYSAXOSTOMA THYSANURA. E. Haeckel. 



Thysanostoma thysanura, E. Haeckel. Das System cler Meclusen. Seite 625. 

 Thysanostomx thysanura, R. v. Lendenfelcl. The Scyphomedusoe of the 



Southern Hemisphere. Proceedings of the Linnean Society of New South 



Wales ; volume ix, part 2, page 303. 



Umbrella nearly orbicular, two or three times as broad as high, with ninety- 

 six marginal flaps (in each octant ten truncate rounded velar flaps between 

 two pointed three-cornered ocular flaps). Ex-umbrella polygonal, slabbed with 

 irregular and granulated slabs, which are scarcely half as broad as the marginal 

 flaps. Sub-genital ostia four or six times as broad as the pillars. Arms two 

 or three times as long as the diameter of the umbrella, very narrow, ribbon- 

 shaped, three-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. 



Genus LEONURA. Haeckel, 1879. 



Suctorial crisps only at the distal ends of the lower-arms above the ter- 

 minal knot. Mouth cross with 8 rays and 8 suctorial crisps in the tertiary 

 radii, which form especial frills round the centre of the brachial disc. 



LEONURA LEPTURA. E. Haeckel. 



Leonura leptura. E. Haeckel. Das System cler Meclusen. Seite 631. 

 Leonura leptura, R. v. Lendenfelcl. The Scyphomedusfe of the Southern 



Hemisphere. Proceedings of the Linnean Society of New South Wales ; 



volume ix, part 2, page 305. 



Umbrella flat, orbicular, with 80 marginal flaps. In each octant 8 

 rectangular velar flaps, between 2 pointed triangular ocular flaps. Sub- 

 genital ostia three times as broad as the pillars between them. Mouth-cross 

 of the brachial disc, with frills ; the 8 rays in pairs. Arms very long and 

 slender, ribbon-shaped, nearly three times as long as the diameter of the 

 umbrella, a bundle of frills at the end which surrounds a pointed three 

 cornered terminal knot. 



Size. Breadth of umbrella, 100 mm. ; height of umbrella, 50 mm. 



Locality. South Pacific Ocean, near New Zealand, Weber. 



There are according to this Australian 26 species, with four varieties, 

 which are distributed among 79 genera. 



Sydney, November 30, 1885. 



