Medusce of the Philippines and of Torres Straits. 197 



Thysanostoma thysanura Hseckel. 



(?) Rhizostoma brachyura, LESSON, R. P., 1829, Voyage de la Coquille, Zoophyt., tome 2, p. 153; 



1830, Centime Zoologique, p. 227, planche 80. 

 Thysanostoma thysanura, HAECKEL, 1880, Syst. der Medusen, p. 625, Taf. 39, Fign 1-9. MAYER, 



1910, Medusae of the World, vol. 3, p. 692, fig. 420. 



The dimensions, in millimeters, of a specimen obtained at Mindanao, Phil- 

 ippine Islands, by the United States Bureau of Fisheries steamer Albatross, 

 are as follows: Bell, 100 wide; perradial diameter of arm-disk, 74; diameter of 

 arm-disk at level of origin of mouth-arms, 48; genital ostium, 40 wide; 

 mouth-arms, 220 long, 24 wide at widest part, 12 wide at their blunt tips; 

 8 to 12 velar lappets in each octant; filamentary appendages on the arm-disk, 

 10 to 15 long; exumbrella finely granular. 



In another large medusa from Mausalay, Mindoro, Philippine Islands, 

 taken by the Albatross on June 4, 1908, from a depth of 150 feet, the bell is 

 120 mm. wide and the mouth-arms 190 mm. long. In a half-grown medusa, 

 obtained on the surface at the same time and place, the bell is 59 mm. wide 

 with finely granular exumbrella; mouth-arms 67 mm. long; arm-disk 41 

 mm. wide at its origin from the subumbrella and 33 mm. wide at the level of 

 the origins of the mouth-arms. 



Two specimens are from Atulayan Bay, east coast of Luzon, June 17, 1909. 

 Of these the larger one was cut into two pieces when viewed by me, but the 

 bell appears to have been about 106 mm. in diameter, the mouth-arms being 

 167 mm. long, the upper arm 20 mm. and the lower arm 147 mm. long. 



A color note leads one to infer that in life the bell was translucent with a 

 slightly brownish margin, and with the frilled mouths dark burnt-umber. 

 The smaller specimen when alive had a translucent bell with some whitish 

 spots and with 8 indigo streaks along the 8 principal radii. The frilled mouths 

 and bell-margin were pale brown. One specimen, 91 mm. in diameter with 

 mouth-arms 155 mm. long, is from Station D 2268, September 21, 1909, depth 

 13 fathoms off Singaan Island north of Tawi Tawi. In this the arm-disk is 

 59 mm. in perradial diameter, and the upper arms are 13 and the lower 

 142 mm. long. 



Genus LORIFERA Haeckel, 1880. 



Himanostoma, preoccupied for Diptera by Loew, 1853. 



Himanostoma, AGASSIZ, L., 1862, Cont. Nat. Hist. U. S., vol. 4, p. 152. 



Lorifera, HAECKEL, 1880, Syst. der Medusen, p. 628. 



GENERIC CHARACTERS. 



Rhizostomata lorifera in which the 8 mouth-arms bear rows of frilled mouths 

 throughout their lengths but terminate each in a naked knob. Among char- 

 acters of minor importance the subgenital ostia are usually wider than the 

 perradial disk-columns. The circular muscles of the subumbrella are prac- 

 tically entire. The sense-clubs have each an ocellus and a well-developed, 

 exumbrella pit with radiating furrows. This genus is distinguished from the 

 closely allied Thysanostoma only by the naked, club-shaped extremities of its 

 mouth-arms. 



Lorifera lorifera var. pacifica (Schultze). 



Himanostoma loriferum, var. pacifica, SCHULTZE, L. S., 1897, Abhandlung, Senckenberg, Naturf. 



Gesell., Bd. 24, Heft 2, p. 153, Taf. 15, Fign. 1, la, 6; 1898, Denkschrift. Med. Nat, Gesell. 



Jena, Bd. 8, p. 446, Taf. 34, Fig. 9 (young medusa). 

 Lorifera lorifera var. pacifica, MAYER, 1910, Medusae of the World, vol. 3, p. 695. 



A single half-grown specimen of this medusa was found at Port Palapag, 

 Luzon, by the United States Fisheries Bureau steamer Albatross on June 2, 

 1909, being captured through the use of dynamite. Its bell is 98 mm. wide, 



