RHIZOSTOAi.E — CATOSTYLUS. 671 



The S ocular radial-canals are joined one to another b\- a thick, irregularly anastomosing, 

 network ot" canals. The ring-canal is not clearl\- detincd. (_)ther radial-canals (? J Color (?) 

 Found at Puna Island, near Guayaquil. ct)ast ol' Ecjuador, South America. 



Catostylus tripterus. 



Toxoclylus IripteruSy Haf-ckkl, iSSo, Syst. der Mcdusen, p. 586. 



Crambtssa nipicra, Vanhoffen, 1902, Wissen. Ergeb. dcutschen Tiefsec Expcd. Valiiiria., Bd. 3, Lfg. 1, p. 52. 



Bell 50 mm. wide, hemispherical. 8 rhopalia, 48 lappets. In each octant 4 wide, nearly 

 quadratic, velar lappets between 2 smaller, but longer, conspicuously projecting, ocular 

 lappets. 8 arms, somewhat longer than bell-radius, are grouped in 4 pairs, and each consists 

 ot a stout, long, nearly c)hndrical upper part of the arm which is twice as long as the 3-cornered 

 pyramidal, lower part of the arm. There are 3 wide, leaf-like projections on this lower part 

 of the arm, and the mouths on their edges are only slightly folded. There are no appendages 

 between the mouths. 4 horseshoe-shaped gonads. 



Found on the west coast ot tropical Africa at Fernando Po Island, on the coast of (luinea. 

 Color (?) 



Catostylus turgescens. 



Toxoclylus turgescens, ScHULTzE, L. S., 1S98, Dcnkschr. Med. Nat. Ges. Jena., Bd. 8, p. 455. taf. 34, figs. 13, 14. 



This is described by Schultze from a single specimen which appears to he quite abnormal — 

 so much so that I have but little faith in its value. 



Bell flatly rounded, 90 mm. wide. Exumbrella smooth. 9 marginal sense-organs. 

 Marginal lappets narrow and sharp-pointed. Number (?) Arrangement (?) 6 subgenital 

 ostia wider than the arm-shafts which separate them. Arm-disk flat. The 6 upper arms are 

 thick, arrowhead-shaped and curve outward; they are about 19 mm. long and 17 mm. wide. 

 Lower arm sharply pointed, only about 12 mm. long. There are thin filaments upon the 

 arm-disk between the mouths, but no other appendages. The canal-system consists ot a fine 

 anastomosing network on the inner and outer sides of the ring-canal. This network does 

 not reach the margin. There are also unbranched radial-canals and blindly-ending centrip- 

 etal canals. Amboina, Moluccas. Color ( ? ) 



Catostylus purpurus, sp. nov. 



This torm is closely related to Catostylus stiphroptcrus, from Ternate, but differs in the 

 number and arrangement of its marginal lappets and in its deep, unitorm dark brownish- 

 purple coloration. 



Disk flatter than a hemisphere, 88 to 115 mm. wide, 26 to 35 mm. high. Exumbrella 

 smooth. 8 rhopalia flanked by shoit, narrow, bluntl\- rounded lappets. A furrowed exumbrella 

 sensory pit above each rhopalium Rhopalar lappets somewhat narrower than the \elar. 

 In each octant there are 4 cleft and 2 simple velar lappets arranged in a definite manner, see 

 A and B, fig. 412. In the middle of each octant there are a pair of cleft velar lappets, and 

 these are flanked on their outer sides by 2 simple velar lappets, which are in turn bordered 

 by 2 cleft velar lappets. Thus the lappets of each octant are arranged in sequence as fol- 

 lows: (i) a small, simple, rhopalar lappet adjacent to the sensory-club; (2) a cleft velar 

 lappet; (3) a simple velar lappet; (4 and 5) 2 cleft velar lappets; (6) a simple velar lappet; 

 (7) a cleft velar lappet; (8) a small rhopalar lappet. Thus the bell-margin displa\s 96 nearly 

 equally spaced notches, there being 16 rhopalar and 80 velar terminal lappets. 



The arm-disk is about as wide as the bell-radius at its origin from the suhumbrella. hut 

 at the level of the origins of the 8 mouth-arms it is somewhat less than three-eighths as wide 

 as the bell-radius. There are 4 long, narrow, genital ostia nearly as wide as the 4 perradial 

 columns of the arm-disk. Each ostium is constricted by a thick, wide, median gelatinous 

 projection from the arm-disk. A long, finger-shaped papilla arises from the suhumbrella 

 surface in the median line on the outer side of and close to the opening of each genital 

 ostium, and this is in some specimens flanked by a pair of cocks-comb shaped, gelatinous 

 projections from the floor of the suhumbrella as is shown in c in text-figure 412. The arm- 

 disk is notched in each perradius. The unitary subgenital cavity is wide and cruciform. 



