Medusae of the Philippines and of Torres Straits. 191 



Lychnorhiza bartschi Mayer. 



Lychnorhiza bartschi, MAYER, 1910, Medusse of the World, vol. 3, p. 674, figs. 413, 414. 



Named in honor of Dr. Paul Bartsch, of the United States National Mu- 

 seum. 



Bell 84 mm. wide, flatter than a hemisphere and with smooth exumbrella 

 surface. Gelatinous substance thick but not very rigid. 8 rhopalia, each 

 with an ocellus, and an exumbrella sensory pit with dendritic furrows over its 

 floor. 96 (8X12) lappets, 10 bluntly pointed velar lappets between 2 some- 

 what smaller ocular lappets in each octant. Arm-disk 51 mm. wide where it 

 arises from the subumbrella, but only 47 mm. wide at the level of origin of the 

 8 mouth-arms. The 4 subgenital ostia are crescent-shaped and each is 

 covered above by a gelatinous flap. They are only half as wide as the perradial 

 columns between them. Each perradial column exhibits a niche on its outer 

 side which bears a superficial resemblance to the subgenital ostia. The sub- 

 genital cavity is unitary. 



The 8 mouth-arms are laterally compressed and 36 mm. long, the lower 

 3-winged parts of the arms being 24 mm. long and 23 mm. wide. Numerous 

 simple, laterally flattened, tapering filaments arise from between the frilled 

 mouths on all sides of the mouth-arms and from the arm-disk. The filaments 

 upon the arm-disk are about 30 mm. long, but those from the outer parts of 

 the mouth-arms are shorter. 



The central stomach is cruciform and about 46 mm. wide. 16 simple radial- 

 canals, 8 rhopalar and 8 adradial. These are all put into intercommunication 

 with a wide ring-canal which is at some distance inward from the margin. 

 The adradial-canals terminate in this ring-canal, but the rhopalar-canals 

 extend onward to the sense-organs. On its inner side the ring-canal gives 

 rise to 16 blindly ending networks of vessels which do not connect either with 

 the stomach or with the radial-canals. On its outer side a fine-meshed net- 

 work of vessels arises from the ring-canal and fuses with the rhopalar vessels. 

 Around the margin at the bases of the lappets is a marginal ring-canal of 

 fine caliber. There is a unitary uninterrupted system of ring-muscles in 

 the marginal zone of the subumbrella, but no radial-muscles. 



The gelatinous substance is translucent and milky in formalin, and the 

 gonads, mouth-frills, and canal-system are milky yellow. Dr. Bartsch states 

 that these colors in the living animal were nearly as they appear in the speci- 

 men preserved in formalin. 



The type specimen was found by the United States Fisheries Bureau 

 steamer, Albatross, at Jolo Anchorage Philippine Islands, on February 13, 

 1908, and 3 others were taken in Limbe Strait, Celebes, in December 1909. 

 The dimensions given above are those of the largest specimen from the Celebes, 

 this being somewhat larger than the type-species previously described in 

 "Medusse of the World/' p. 674. 



Lychnorhiza bornensis, sp. nov. 



A single specimen of this medusa was found at Tawao, Borneo, on Sep- 

 tember 30, 1909, at 9 h 30 m a. m. 



Bell 89 mm. wide, exumbrella smooth, somewhat flatter than a hemisphere. 

 8 rhopalia, each with an ocellus and a furrowed exumbrella pit. The rhopalar 

 lappets are very short and lanceolate. In each octant there are usually 7, 

 occasionally 8, velar lappets. The lappets adjacent to the rhopalar lappets 

 are about twice as wide as the remaining velar lappets. All are oval and 

 bluntly rounded. 



