670 MEDUSAE OF THE WORLD. 



Catostylus stiphropterus. 



Crambcssa stiphroptrra, SCHULTZE, L. S., 1897, Abhandl. Senckenberg, Naturforsch. Gcscll. Frankfurt a. M., BJ. 14, Heft 2, 

 p. 159, taf. 15, fign. 4, 5, 5<J. 



Bell flatly rounded, 100 mm. wide, with a smooth, exumbrella surface which lacks the 

 protuberances found in C. tnostiicus. There are 8 marginal sense-organs. The rhopalar, 

 marginal lappets are slender and sharp-pointed, and in each octant there are at least 5 larger, 

 cleft, velar lappets about 10 mm. long and 6 mm. wide at their bases. The arm-disk is about 

 38 mm. in diameter, somewhat less in width than the bell-radius. The 4 arm-disk-columns 

 are nearly as wide as the 4 narrow, subgenital ostia. Lower arm 5 times as long as upper, the 

 total length of both not quite equal to that of the bell-radius. Upper arm wholly free, differing 

 in this respect in the number of its marginal lappets and in its narrow subgenital ostia from 

 C. palmipes. 



The exumbrella displays 4 perradial areas of indistinct, round, brown spots which do 

 not extend to the bell-margin. 



Found at Ternate, Malay Archipelago. 



Catostylus viridescens. 

 Crambessa viridescens, CHUN, 1896, Mitthcil. Naturhist. Museum, Hamburg, Jahrg. 13, p. 12, taf. I, fig. 2. 



Bell 80 mm. wide, hemispherical. Marginal lappets ( ?) Arm-disk wider than the bell- 

 radius. Subgenital ostia wider than the spaces between them. 8 short mouth-arms, not 

 longer than bell-radius. Upper arm about one-fifth as long as the lower part. Bell sea-green, 

 mouth-arms colorless. Frilled mouths dark-violet. Two specimens found at the mouth of 

 the Pangani River, East Africa, late in November. The marginal lappets were lost in both 

 specimens. Characterized chiefly by its sea-green color. 



Catostylus ornatellus. 



Loborhiza ornatella, VANHOFFEN, 1888, Bibliotheca Zoologica, Bj. i, Heft. 3, pp. 28, 41, taf. 2, fign. 3-6. 



Disk flatly rounded, the gelatinous substance thick. Size ( ?) The exumbrella is finely 

 and evenly granulated, but these granules fuse into rows upon the marginal lappets. 8 mar- 

 ginal sense-organs and 80 marginal lappets. In each octant there are 4 pairs of bluntly pointed, 

 nearly rounded, velar lappets, and 2 very small, sharp-pointed, lancet-shaped ocular lappets. 

 The velar lappets adjacent to the ocular lappets project farther outward and are sharper- 

 pointed than the remaining velar lappets. There is a powerfully developed zone of ring- 

 muscles in the subumbrella, but these are relatively indistinct and somewhat interrupted 

 in the radii of the 8 ocular radial-canals. 



The arm-disk is supported by 4 thick arm-pillars, which flare outward at their sub- 

 umbrella bases so as to recall a Maltese cross when viewed looking toward the subumbrella 

 surface. The 4 perradial columns of the arm-disk are about as wide as the 4 genital ostia, 

 but they appear wider than the genital ostia, for their flaring bases curve around in 8 hook- 

 like lateral projections so as to partially close the openings of the genital ostia. The opening 

 of each genital ostium is still further blocked by a triangular pointed flap of the arm-disk 

 which projects over the middle of the ostium, so that each osiium appears as if constricted 

 into 2 side-openings (see figures by Vanhoffen, 1888, taf. 2). The arm-disk is octagonal, 

 and there is a unitary subgenital porticus with 4 folded, U-shaped gonads. 



The 4 pairs of mouth-arms are very thick, but only about two-thirds as long as bell- 

 radius. The simple upper half of each arm is short, but the lower half gives rise to 2 dorsal, 

 wall-like lamellz which bear the mouths on their free outer edges. The ventral side of each 

 mouth-arm also gives rise to a similar lamella; and thus the lower parts of the mouth-arms 

 are 3-rayed in cross-section. The 2 dorsal lamellae are set ofF one from another at an angle 

 of about 60, while the ventral lamella is at an angle of 150 from the 2 dorsal lamellz. The 

 outer edges of these 3 wing-like lamellae fold in and out and give rise to short, lateral branches, 

 along the edges of which the numerous mouths are placed. There are neither filaments nor 

 other appendages among the mouths. The 3 wings of the mouth-arms end in a blunt point at 

 the lower extremity of the mouth-arms. 



