NO. 1931. NEW MEDUSA FROM THE PHILIPPINES— BIQELOW. 257 



In the type the tentacles are arranged rather irregularly, some 

 opposite canals, some between canals, some canals without tentacles. 

 But in the specimen 36 mm. in diameter they are all opposite canals. 

 The table shows that tentacles range from about as numerous as 

 canals to almost twice as many. The tentacular bulbs are not later- 

 ally flattened, but cylindrical and stout. They have no spurs clasping 

 the exumbrella, though they are truncate basally. 



In addition to tentacles the margin bears a large number of rudi- 

 mentary knobs. In one specimen in which I could count them 

 approximately there were 29 canals, 28 tentacles, and about 110 

 knobs: 6, 4, 4, 11 between four successive pairs of tentacles. The 

 A^ery large number of bulbs contrasted w4th the invariably rather 

 small number of tentacles shows that at least most of the former 

 remain permanently rudimentary. Both tentacles and knobs bear 

 excretory papillse. These are unusually long, so that at first sight 

 I took them for a third class of tentacles. But examination reveals 

 their true nature. In all the specimens they are of the same remark- 

 able proportions; the character, then, is constant enough to be a 

 helpful field mark to the species. 



The otocysts, of the usual closed type, are extremely numerous, 

 from 0-3, usually 1 or 3 between every two bulbs, or bulb and ten- 

 tacle, as the case may be. This indicates a total number of upward 

 of 200, but I have not been able to count them all in any specimen. 

 Each contains 1-3 otoliths. They are all so small that photographs 

 do not show them, but they are easily made out in the specimens 

 themselves. 



Gonads. — The sexual glands are of the usual ^quorid type. 



Subumhrella sculpture. — This is one of the most characteristic 

 features of the species, one shared by but few other ^Equorids (as 

 ^quorea grcenlandica) . The central two-thirds of the disk is lenticu- 

 lar; the outer third hangs down; the sculpture is restricted to the 

 former. Between every two canals there is a longitudinal row of stout 

 gelatinous papillae, conical and very stiff. The largest number counted 

 m anyone row was 15; the usual number is from 5-10; I once saw 

 as few as 4. In the region of the manubrium these papillae are 

 represented by rounded knobs occupying the spaces between the 

 canal-stripes. The number of knobs is variable; in one example 

 there were 16. The upper wall of the stomach is often torn away 

 where it covers them. "When, as in the type, this is not the case, it 

 is not possible to count them. 



The preserved specimens are colorless. 



The Sihoga specimens were taken in Malay Archipelago. The.early 

 records of the genus are from New Guinea and from the Straits of 

 Sunda. 



Type.— Csit. No. 29388, U.S.N.M., from Albatross station 5190. 

 48702°— Proc.X.M.vol.43— 12 17 



