KHIZOSTOM.E — CATOSTYLUS. 669 



Catostylus stuhlmanni. 



Cramheaa Huhlmaiini, Chun, iSijh, Mittlieil. Naturhistor. Museum, Hamburg, BJ. 13, p. 10, taf. 1, 1 fign. 



Bell hemispherical, 80 to 200 mm. wide. 8 marpnal sense-organs, set within deep clefts 

 in the bell-margin. 112 marginal lappets. The ocular lappets are short, pointed and small, 

 but the 12 velar lappets in each octant project farther outward and have rounded margins. 

 They are separated one from another by long, deep grooves extending up the sides of the ex- 

 umbrella. Each of these lappets is provided with a median longitudinal row of sharp-pointed 

 projections on the exumbrella side. The 8 mouth-arms are bluntly pointed and are shorter than 

 the bell-diameter. The subgenital ostia are one-third to one-fourth as wide as the columns 

 between them. A unitary, subgenital porticus. 



The bell is yellowish-brown or milky-yellow, besprinkled with purple-brown blotches, 

 which are most numerous near the margin. The marginal lappets have rusty-brown, longi- 

 tudinal median streaks. The arms are colorless and the mouths are usually spotted with 

 brownish-purple. 



8 specimens found 4 miles above the mouth of Ouilimane River, East .Africa, in February 

 and March. Described in detail by Chun, 1896. 



This species resembles C. orsiiii iu that the mouths are not developed upon the lower, 

 pointed, knob-shaped ends of the mouth-arms. The outer zone of circular muscles of the 

 subumbrella is interrupted near the margin in the 8 principal radii, but centripetal to this 

 they are unbroken and form a complete annulus. 



Catostylus orsini. 



Mastigias orsini, Vanhoffen, 1888, Bibliotlieca Zoolngica, Bd. I, Heft. 3, pp. 34, 44, taf. 4, fign. 2-4; 1902, Wisscn. Ergeb. 

 deutsch. Tiefsec Expedition, Dampfcr Valdivia, Bd. 3, Lfg. I, pp. 4S, 49.— M.'Vas, 1903, Scyphomedusen der Siboga 

 Expedition, Monog. 11, pp. 63-66. 



Umbrella 65 mm. wide, with smooth, exumbrella surface flatly rounded with incurved 

 margin. 8 marginal sense-organs. 144 small, sharp-pointed, marginal lappets. 16 velar 

 lappets between 2 somewhat smaller, ocular lappets in each octant. A radial furrow extends 

 up the side of the exumbrella in the line of the cleft between each adjacent pair of lappets. 

 The 8 sense-organs are set within deep niches and there is an exumbrella sensory pit with 

 radiating furrows above each sense-club. The subumbrella displays a deep annular furrow 

 on the inner side of which lies the ring-canal. Centrifugal to this furrow is a zone of power- 

 ful circular muscles, which are not interrupted in the 8 principal radii. 



The arm-disk is nearly as wide as the radius of the bell and the 4 arm-disk pillars are 

 wider than the ostia of the subgenital porticus. The simple upper part of each of the 8 mouth- 

 arms is ver\- short and onl)' one-third as long as the 3-winged lower part of the arm. It is 

 also thin and ribbon-like, and in this respect is in marked contrast to the large, 3-cornered 

 lower part of the arm. The upper part of the arm bears no dorsal mouths, but only a single 

 row ot frilled mouths along its ventral side. The large, 3-sided, lower part of the arm is elongate, 

 prismatic, with a short gelatinous, pyramidal, bluntly pointed, 3-cornered knob at its end. 

 .'\ltogether the entire mouth-arm is about as long as the bell-radius. The lower part of the arm 

 bears frilled mouths, but neither filaments nor other appendages. The lower end of the arm 

 is naked and devoid of mouths, as in Catostvliis stuhlmannt, and forms a blunt, triangular 

 knob which on the outer side is nearly half as long as the upper part of the arm itself, but 

 only one-third of this length on the two radial sides. 



8 canals extend down the middle of the 8 mouth-arms and send ramifying branches to 

 the frilled mouths. These 8 arm-canals enter the small, central stomach, from which arise 

 16 straight radial-canals, 8 ocular and 8 adradial, connected one with another by a wide, 

 circular vessel. An anastomosing network of vessels arises on the inner side of the ring-canal 

 between the radial-canals, although this network does not fuse with the radial-canals them- 

 selves, but arises solely from the ring-canal. The radial-canals are about twice as wide as 

 the ring-canal. The unitary, subgenital porticus is very small. Color (?) Found at Assab, 

 Red Sea, in June. 



