RHIZOSTOM.E LOUIFKRA. 695 



Lorifera lorifera "var." pacifica. 



Himaniosloma loriferum, var. facifca SCHULTZE, L. S., 1897, Ablandlung. Scnckcnbcrg. Naturf. Gescll., B.I. 14, Heft l, p. 153, 

 taf. 15, fign. I, la, 6; 1898, Denkschrift. Med. Nat. Gesell. Jena, Bd. 8, p. 446, taf. 34, fig. 9 (young medusa). 



This variety is described by Schultze from Ternate and from Amboina, Malay Archi- 

 pelago. 



Bell flatly rounded, 200 mm. wide and 50 to 60 mm. high. 8 marginal sense-organs. 

 64 marginal lappets; each octant has 2 sharp-pointed rhopalar lappets and 6 velar lappets 

 separated one from another by long, deep furrows; the outer edges of these velar lappets are 

 rounded and each lappet usually displays a median cleft, as in L. lorifera, or is even further 

 divided; outer edges of velar lappets evenly rounded. The 4 subgenital ostia are j to 

 4 times as wide as the arm-columns between them. The 8 mouth-arms are 1.5 times as long 

 as diameter of disk. Thus in a medusa 200 mm. in diameter the arms are each 290 mm. long. 

 The simple upper arm is only 10 mm. long; below this each arm expands into a ^-winged 

 appendage, with two outer and one inner wing. This 3-winged part of mouth-arm is very 

 short and extends below in a very long, slender, 3-sided lash, the angles of which bear frilled 

 mouths. This lash terminates below in a small, vesicular, naked knob. The gastric canal 

 which enters each lower mouth-arm sends out a longitudinal branch into each of the 2 dorsal 

 wings. These branches are put into communication with the central canal of the arm In- 

 frequent cross-branches, and the side branches into the mouth-grooves often anastomose. 



In the middle of the bell is a dark blue-violet area. Near the bell-margin the color is 

 brownish or white. The marginal lappets are violet. The smooth, outer side of the upper arm 

 is transparent. The thick, proximal parts of the lower arms are light-brown in their basal parts, 

 but throughout the greater portion of their lengths they are violet. 



This "variety" is probably identical with Haeckel's L. lorifera from the Red Sea. The 

 slight differences mentioned by Schultze may readily be due to individual variation. For 

 example, in the medusa from the Malay Archipelago the lower side of the arm-disk along the 

 lines of the 8 axial rows of mouth-openings is beset with a felt-like mass of long, thin filaments. 

 These are absent, however, in Haeckel's medusa from the Red Sea. Schuhze has seen Haeckel's 

 original specimen in Berlin and finds that it is a male, whereas the medusa from the Malay 

 Archipelago is a female. It is possible, therefore, that this difference in the condition of the 

 lower surface of the arm-disk may be sexual. 



Lorifera flagellata. 



Himantoitoma fagtllata, HAECKEL, 1880, Syst. der Medusen, p. 629. MAAS, 1903, Scyphomcduscn der Siboga Expedition, 



Monog. 11, p. 77, taf. 10, fign. 87-92; taf. n, fig. 101. 



The bell is flatly rounded and may be 200 mm. in width. The gelatinous substance is 

 thick, tough, and of a porcelain-like whiteness. The exumbrella bears fine granulations, 

 and near the margin are light-brown punctations, especially numerous over the marginal 

 lappets, where they are rendered especially conspicuous owing to the white color of the under- 

 lying gelatinous substance. 



There are 8 marginal sense-clubs each with a large swollen end containing a concretion 

 and a pigment-spot of horseshoe shape. The covering scale over each sense-club is wider 

 than it is long, and there is a well-developed sensory pit upon the exumbrella side. The 

 bottom of this pit exhibits radiating furrows. The 8 sense-clubs are flanked by 16 short, 

 pointed, ocular lappets, and between each successive pair of sense-organs are typically 8 

 large, rounded, velar lappets. Thus there are in all 80 marginal lappets. 



The arm-disk is 8-sided and the 4 interradiul, subgenital ostia are nearly twice as wide 

 as the pillars between them. These pillars of the arm-disk are peculiar. Near their points of 

 origin from the subumbrella each pillar is dmded so that 2 arches of gelatinous substance 

 extend downward to the base of the upper arm. Spanning these arches is a well-developed, 

 gelatinous membrane which also spans the 4 interradial spaces between the anii-disk-pillars 

 and overlaps the 4 subgenital ostia. This peculiar arrangement is well described by L. S. 

 Schultz, 180,8, in L. lorifern var. pacifica (see Denkschr. Med. Nat. Gesell., Jena, Bd. 8, 

 p. 447). The arches and the cross-spanning membrane extend so far down the length of the 

 upper arm that only a small portion of the latter is free. 



