218 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



in this ring-canal, but the rhopalar-canals extend outward 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 

 network 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 uninter- 

 rupted system of ring-muscles in the marginal zone of the sub- 

 umbrella, but no radial-muscles. 



The gelatinous substance is translucent and milky in formalin, 

 and the gonads, mouth-frills, and canal-system are milky yellow. 

 Doctor Bartsch states that these colors in the living animal were 

 nearly as they appear in the specimen preserved in formalin. 



The type-specimen, Cat. No. 27942, U.S.N.M., was found by the 

 United States Fisheries Bureau steamer Albatross at Jolo Anchor- 

 age, Philippine Islands, on February 13, 1908, and three others (Cat. 

 no. 28737, U.S.N.M.) were taken in Limbe Strait, Celebes, in Decem- 

 ber, 1909. The dimensions given above are those of the largest 

 specimen from the Celebes, this being somewhat larger than the type- 

 species previous^ described. 1 



LYCHNORHIZA BORNENSIS Mayer. 



Lychnorhiza bomensis Mayer, 1915, Publication No. 212, Carnegie Institu- 

 tion of Washington, p. 191, fig. 6. 



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

 September 30, 1909, at 9h. 30m. a. m. Cat. No. 28736, U.S.N.M. 

 Type. 



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

 hemisphere. Eight rhopalia, each with an ocellus and a furrowed 

 exumbrella pit. The rhopalar lappets are very short and lanceolate. 

 In each octant there are usually seven, occasionally eight, velar lap- 

 pets. The lappets adjacent to the rhopalar lappets are about twice 

 as wide as the remaining velar lappets. All are oval and bluntly 

 rounded. 



The arm disk is half as wide as the bell, and the subgenital porticus 

 is unitary. The external faces of the perradial columns have each a 

 slight concavity, not a deep niche, as in Lychnorhiza bartschi. The 

 subgenital ostia are twice as wide as the perradial columns and each 

 is arched over by a flap-like projection. There are also four inter- 

 radial papillae upon the subumbrella, one opposite the opening of 

 each subgenital ostium. 



The eight mouth-arms are not quite two-thirds as long as the bell- 

 diameter, the upper arms being not quite half as long as the lower 

 arms. Each mouth-arm terminates in a single, slender, tapering, 



1 Medusae of the World, p. 674. 



