288 THE VOYAGE OF H.M.S. CHALLENGER. 



Mediterranean, from whence they extend to the Bermudas, then into the West Indies, 

 and dowTi the eastern coast of South America to Brazil. 



Sivi/tia, Duchassaing and Michelotti. 



The single species described, Swiftia exserta, D. and M., was found at Saint Croix, 

 in the West Indies. 



Danielssenia, Grieg. 



The species described by Grieg, Danielssenia irramosa, was found at Risor on the 

 coast of Norway. 



Eugorgia, Verrill. 



The species of this genus seem confined to the western shores of America, Peru, 

 Panama, California. 



Xiphigorgia, ^Milne-Ed wards; Hymenogorgia, Valenciennes; Phycogorgia, Valenciennes. 



The various species of these genera are limited to the Atlantic Ocean, chiefly the 

 West Indies, and the region a few degrees north and south of the Equator. No species 

 of these genera were found during the voyage. 



Family VII. Gorgoxellid/E. 



Nicella, Gray. 



In 1859 Dr. Gray described a species from the Mauritius under the name of 

 Scirpearia dichotoma, Gray, and then for the same species, in the Catalogue of Stony 

 Corals in the British Museum, 1870, he established the genus Nicella, altering the 

 specific name into Nicella mauritiana, as indicative of its habitat. 



Scirpeana, Cuvier (?). 

 The species of this genus apparently come from the Atlantic Ocean. 



Scirpearella, n. gen. 



All the species come from the Pacific Ocean, Scirpearella ruhra being found at 

 Japan; Scirpecu-ella profunda and Scirpearella gracilis were dredged off the Ne^' 

 Hebrides, and Scirpearella. moniliforme at Amboina. 



