SCYPHOMEDUSAE COLLECTED BY STEAMER "ALBATROSS." 197 



Other dimensions of this medusa (given in millimeters) are as 

 follows: Tentacular pedalia, 11.5 long, 10.5 wide; rhopalar pedalia, 

 11.5 long, 8.5 wide; diameter across subumbrella to outer edge of 

 ring-muscle, about 126; width of ring-muscle, 77.5; diameter across 

 zone of gonads, about 96 (each gonad is circular, disk shaped, and 

 about 15 in diameter, the medusa being a female and apparently 

 nearly mature); diameter across central stomach, about 66; length 

 of manubrium, 46. 



It thus appears that in this specimen the central lens is more 

 than half as wide as the medusa, as in A. bairdii and A. verrilUi, 

 its outer margin being slightly notched as in A. bairdii and A. val- 

 divae. The annular ridge is probably concealed under the over- 

 arching edge of the central lens, as in A. wyvillei and A. verrillii. 

 Part of the outer edge of the annular ridge is entire and even, as in 

 A. bairdii and A. valdiviae, and part of it is notched and furrowed, 

 as in the typical A. gigantea. 



It is probable that most of the so-called specific distinctions be- 

 tween the various Atollas are mere individual peculiarities of no 

 greater specific value than the difference between blue eyes and 

 brown in man. 



List of stations among the Philippines from which specimens of Atollas allied 

 to A. wyvillei were obtained. 



D5201, April 10, 1908, from Sogod Bay, Southern Leyte Island, depth 554 

 fathoms, bottom gray sand and mud. One typical A. wyvillei with 23 ten- 

 tacles. Dimensions given in table. Cat. No. 28231, U.S.N.M. 



D 5285, July 20, 1908, about 17.5 miles off Malavatuan Island in the China Sea, 

 depth 272 fathoms, bottom soft mud. Eleven specimens of medium size, not 

 well preserved, but all are probably A. wyvillei. Cat. No. 28685, U.S.N.M. 



D5348, December 27, 1908, in Palawan Passage, about 33.5 miles from Point 

 Tabonan, depth 375 fathoms, bottom coarse sand. One specimen too imper- 

 fect for accurate specific determination. Cat. No. 28681, U.S.N.M. 



D 5471, June 19, 1909, about 15 miles off Sialat Point Light on the east coast 

 of Luzon, depth 568 fathoms. Two specimens closely allied to A. alexandri, 

 one with 29 and the other with 26 tentacles. The dimensions of both are 

 given in the table. Cat. No. 28686, U.S.N.M. 



D5486, July 31, 1909, about 6 miles off Batobolo Point, between Leyte and 

 Mindanao, depth 585 fathoms. Four badly preserved specimens, too imperfect 

 for specific determination. Cat. No. 28708, U.S.N.M. 



D 5493, August 2, 1909, about 5.5 miles off Diuata Point, between Leyte and 

 Mindanao, depth 47S fathoms, bottom green mud. Four specimens of A. 

 wyvillei. The largest was 60 mm. wide, central lens 44 mm. wide with in- 

 dented margin, 22 tentacles each 21 mm. long. Another medusa was 50 mm. in 

 diameter, central lens 29.5, with indented margin and 23 tentacles. Another 

 medusa was 42 mm. in diameter, central lens 33 mm. wide with distinct 

 radial furrows and notched margin, 24 tentacles. The smallest medusa 

 was 31 mm. wide, central lens 21 mm. wide with radial furrows and notched 

 margin, 23 tentacles. Cat. No. 28689, U.S.N.M. 



