NARCOMEDUS/E — PEGANTHA. 443 



The central stomach is a lenticular pouch as wide as the central disk of the medusa. 

 Peripherally it gives rise to 18 loop-canals which extend outward on both sides of the tentacles 

 aZd the'margin of each lappet. These 18 "loop-canals" are flat ribbon-like, and about 

 one-eighth as wide as the lappets themselves, and their entoderm is ciliated. The mouth is a 

 simple round opening with thick swollen lips. The gonads are developed in the subumbrella 

 ectoderm over 18 folded, sac-shaped, peripheral outpocketings of the run of the stomach, 

 there being one of these pouches on the subumbrella s.de of each of the 18 lappets. 



Found at a depth of 82 fathoms on October 26, 1874, near Mindanao, Philippine Islands. 



Beautifully figured and described in detail by Haeckel, 1881. 



Pegantha martagon Haeckel. 



Peganlha ma r,a g on, H A ,CK EL , ,879, Syst. der Medusen, p. jjrfaeWW. H.B., . 9 o 9> Men, Museum Comp. Zoo., a, Harvard 

 Pega ,™^^™^£™^ ■ 9°4. *-U. Museum Comp. Zoo,. * Harvard College, vo.. 39, P- *H P- 5, 



figs. 19, 10. 



Bigelow gives the best description of this medusa. Bell 20 mm. wide, hemispherical or 

 higher with thick gelatinous substance. Exumbrella centripetal to tentacle insertions smooth 

 Each appet sculptured by a median ridge and a less prominent ndge in the line of each 

 otoporpa 9 to 13 lappets and tentacles. Lappet-margins evenly rounded. 6 to 9 sensory- 

 c ubs a.td ot'oporpi on each lappet-margin. Each club contains 2 to 3 concretions. Stomach 

 lenticular, without marginal pockets. Peronial and ring-canals well developed. Mouth a 

 round opening. An irregularly lobed genital sac in each lappet radius. Cavity oi each genital 

 sac occupied by a plug* of gelatinous substance. Colorless. Trop.cal Pacific and Ind.an 

 Oceans. (See text-fig. 295 and 296.) 



Pegantha triloba Haeckel. 



P tt amka trite*, *««, -»79, *«• - Medusen, p. 333, * .» ngn. 4-7.-8.0^, H. B, ,909, Mem. Museum Comp. 



Zool. at Harvard College, vol. 37, p. 87, plates 14, 16, 20, and 45. 

 Solmarh hsculpa, May™, 1906, Bull. U. S. Bureau of F.shenes, vol. 23. P- ' H°- ]*«« 3> «*•• «. 9- 

 ( ?)p,. anI A a ? Wri/.4 fl> Halckul, 1879, Syst. der Medusen p. 333. 



PpJtha sp Fewkes, 1889, Report U. S. Commission Fish and Fisheries for 1886 p. 527, plate I, tigs. I, 

 (tfZ^Z t yaZ g r a «ma,V^6T^, .908, Narcomedusen der V a ld,v,a Expedition, p. 56, taf. 2, fig. 8. 



The best description of this medusa is given by Dr. H. B. Bigelow, .909; my own account 

 in ioo6, containing several serious errors, is untrustworthy. 



According to Bigelow, who studied both living and preserved specimens, the bell is 22 

 mm wide and 12 high, with extremely rigid, gelatinous substance 



From the insertion of each tentacle a deep furrow runs inward nearly to the apex o the 

 bell- on either side of these furrows there are ridges which extend down to the margin of the 

 lapp'ets; in the middle lines of the lappets and also extending to the bell apex are a second 

 eries of ridges, and finally there are less prominent ridges confined to the lappets along the 

 ines of the otoporpa:. There are 12 to 16 ovate, pointed lappets alternating with an equal 

 number of stiff tentacles which curve inward into the bell-cavity and are about as long as 

 "he bell-diameter. 18 to 20 sensory-clubs per lappet. Each club with 2 to 3 concretions and 

 situated upon a sensory pad. Long tapering otoporpa: extend upward trom the sensory pad 

 to the level of the bases of the tentacles. These otoporpa: anastomose to some extent oyer the 

 exumbrella, and they gradually grow narrower and narrower above the bell-margin unt.l they 

 disappear. Stomach lenticular, mouth a round opening, peripheral and peronial canals well 

 Sped. A zone of gonads in the ectoderm of the margin of the stomach projecting into 

 the appet cavities. Each gonad 3-lobed. The central lobe of each gonad is supported by a 

 plug o^gelatinous substance,whik the lateral lobes are flat, leaf-like and variously subdivided 

 P g Thf entire medusa is of a delicate violet-pink, the entoderm being ot deeper hue. The 

 distal parts of the exumbral ridges and the otoporpa: are deep purple. (bee tig. 297.) 



Widely distributed over the tropical Pacific, Atlantic, and Ind.an Ocean,. Haecke s 

 P. q uadrillha is probably the same medusa, for some of the gonads of P. tnloba occasionally 



^olt^'cyano^rnrna of Vanhoffen is very briefly described but is probably P. tnloba. 

 It is 17 mm. wide, has 15 tentacles; gonads 3-lobed. There are 48 radiating ndges over the 



