180 Papers from the Department of Marine Biology. 



Genus DACTYLOMETRA L. Agassiz, 1862. 



Dactylomeira, AGASSIZ, L., 1862, Contributions to Nat. Hist. U. S., vol. 4, p. 166. 



GENERIC CHARACTERS. 



Pelagidae with 8 rhopalia. 5X8 tentacles and 6X8 marginal lappets. 



Dactylometra africana Vanhoffen. 



Dactylomeira africana, VANHOFFEN, 1902, Wissen. Ergeb. deutsch. Tiefsee Expedition, Dampfer 

 Valdivia, Bd. 3, Lief. 1, p. 40, Taf. 4, Fig. 20. 



Disk 100 to 130 mm. wide with exumbrella thickly covered with wart-like 

 clusters of nettling cells. 6 well-developed marginal lappets and 5 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 coloration 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, 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 D 5461, 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 nematocyst 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, 166 mm. in diameter and with mouth-arms 280 mm. long, 

 was found at Kowloon, China, on August 14, 1908. It has 3X8 tentacles, 

 and 6X8 marginal lappets, the lappets being edged on their exumbrella margins 

 with russet brown. 



Light (1914, Philippine Journal of Science, vol. 9, p. 198) records a Dacty- 

 lometra from the Philippines which he believes is identical with D. quinque- 

 cirrha. The bell is white, translucent, and covered on the exumbrella with 

 minute white spots. 



Light's specimens were all in the Chrysaora stage with 24 tentacles and 32 

 marginal lappets. The sting which this medusa inflicts is far more severe 

 than that given by the Dactylometra of our American coast. 



Genus SANDERIA Goette, 1886. 



Sanderia, GOETTE, 1886, Sitzungsber. Akad. Wissen. Berlin, Jahrg. 1886, p. 835. VANHOFFEN, 

 1902, Wissen. Ergeb. deutsch. Tiefsee Expedition, Dampfer Valdivia, Bd. 3, Lief. 1, p. 37. 



GENERIC CHARACTERS. 



Pelagidse with 16 marginal sense-organs, 16 tentacles, and 32 cleft marginal 

 lappets. 4 lips, 4 interradial gonads, and 32 peripheral stomach-pouches in 

 the radii of the tentacles and sense-organs. No marginal ring-canal. 



Sanderia malayensis Goette. 



Sanderia malayensis, GOETTE, 1886, Sitzungsber. Akad. Wissen. Berlin, Jahrg., 1886, p. 835. 

 VANHOFFEN, 1902, Wissen. Ergeb. deutsch. Tiefsee Expedition, Dampfer Valdivia, Bd. 3 

 Lief. 1, p. 38, Taf. 3, Fig. 12; Taf. 8, Fign. 69-74. MAYER, 1910, Medusa; of the World, 

 vol. 3, p. 590. 



Found in the Indian Ocean, Gulf of Aden, at Singapore, and off the east 

 coast of Africa. Some specimens of this medusa were found by the U. S. 

 Fisheries Bureau steamer Albatross in the Philippine Islands between March 

 and June 1908. 



