Boone, Coelenterata, Cruises of "Ara" and "Alva" 31 



known on the southeastern coast of the United States and in Carib- 

 bean waters, is one of those highly specialized Rhizostomata that 

 has not changed since the two oceans became separated by the 

 elevation of the Isthmus. 



The fifth medusa, Pelagia noctiluca (Forskal), a member of 

 the Semaeostomeae, was taken in the Atlantic Ocean, near the 

 Canary Islands. 



The species of medusa are distributed as follows : 



Pelagia noctiluca (Forskal), Atlantic Ocean, off Canary 

 Islands. 



Cephea cephea (Forskal), Pacific Ocean, north of Nuka Hiva 

 Island, Marquesas Islands. 



Mastigias papuxi (Lesson), Muntok, Banka Island, Banka 

 Straits, Dutch East Indies. 



Versura palmata (Haeckel), Muntok, Banka Island, Banka 

 Straits, Dutch East Indies. 



Stomolophus meleagris (L. Agassiz), Conway Bay, Galapagos 

 Islands. 



Alcyonacea 



The Alcyonacea are represented by four species of exceptional 

 interest. Lobularia ceylonicurn (Pratt) discovered by the Ceylon 

 Pearl Oyster Fisheries Investigations of the Gulf of Manaar, and 

 recorded only once since then, when it was taken by the "Siboga" at 

 Jedan Island, Dutch East Indies, was taken by the "Alva" on 

 Teviatoa Reef, Raiatea Island, Society Islands, in abundance, this 

 material being the first deposited in an American museum. The 

 geographic range of the species is extended by several thousand 

 miles. 



Three large colonies of Alcyonium confertum (Dana) were 

 taken in the Fiji Islands and appear to be the first record of this 

 interesting species, since Prof. Dana secured his type in this archi- 

 pelago nearly a hundred years ago. 



TTie "Ara" World Cruise obtained two new species of Alcy- 

 onacea. These include a new Sarcophytum unique in its spicula- 

 tion, Sarcophytum reticulatum Boone from the littoral zone of 

 Pulo Condore, Anambas Islands, and a new Dendronephthya, also 

 from the south China Sea. Dendronephthya rosamondae Boone 

 was dredged off Terampa Cove, Siantan Island, in 33 fathoms, a 

 magnificent colony, remarkably beautiful. 



