SCYPHOMEDUSAE COLLECTED BY STEAMER " ALBATROSS.' ' 201 



each ostium is 28 mm. long (circumferentially) and 15 mm. wide 

 (radially), while the perradial columns of the mouth-arms are only 

 13 mm. wide. 



In formalin the general color of the medusa is milky custard- 

 yellow, the gonads being lighter. The apex of the exumbrella is 

 besprinkled with cinnamon-colored nematocyst warts, and the 16 

 radial streaks of light umber color are also besprinkled with brown- 

 colored clusters of nematocysts. This medusa is widely distributed 

 over the north Pacific from Kamtschatka to California, but this 

 Philippine Island specimen is the first which has been obtained in 

 the tropics. 



Genus DACTYLOMETRA L. Agassiz, 1862. 



Dactylometra L. Agassiz, 1862, Contributions to Nat. Hist. U. S., vol. 4, 

 p. 166.— Mayer, 1910, Medusae of the World, vol. 3, p. 583. 



Generic Characters. — Pelagidae with 8 rhopalia. 5X8 tentacles 

 and 6X8 marginal lappets. 



DACTYLOMETRA AFRICANA Vanhoffen. 



Dactylometra africana Vanhoffen, 1902, Wissen. Ergeb. deutsch. Tiefsee 

 Expedition, Dampfer Valdivia, vol. 3, Lief. 1, p. 40, pi. 4, fig. 20. — Mayer, 

 1910, Medusae of the World, p. 588. 



Disk 100 to 130 mm. wide with exumbrella thickly covered with 

 wart-like clusters of nettling cells. Six well-developed marginal 

 lappets and five long tentacles in each octant. Lappets and tentacles 

 red. Red radial streaks over exumbrella. Esophagus, palps, and 

 gonads not highly colored. Colors of large specimens duller and 

 more brownish than those of small medusae and not unlike the color- 

 ation of D. quinquecirrha. Distinguished by its lappets being deeply 

 pigmented near the margin on the exumbrella side. 



Vanhoffen's specimens came from the Great Fish Bay, coast of 

 German southwest Africa, in October, 1898. Five specimens (Cat. 

 No. 28679, U.S.N.M.), all imperfect, the largest about 105 mm. in 

 diameter and with only 3X8 tentacles and 4X8 marginal lappets, 

 were found by the Albatross at station D5461, June 14, 1909, at a 

 depth of 12 fathoms, about 7.2 miles off Corregidor Light, Manila 

 Bay, Luzon. The bells are pinkish in hue, and thickly and uniformly 

 besprinkled over the exumbrella with red-brown mematocyst warts. 

 The lappets are edged on the exumbrella side with reddish brown. 

 The tentacles have been lost and the mouth parts are imperfect. 



Another specimen (Cat. No. 28680, U.S.N.M.), 166 mm. in di- 

 ameter and with mouth-arms 280 mm. long, was found at Kowloon, 

 China, on August 14, 1908. It was 3X8 tentacles, and 6X8 marginal 

 lappets, the lappets being edged on their exumbrella margins with 

 russet brown. 



