REPORT ON THE ALCYONARIA. 279 



In the Pacific Ocean five species are found, extending from Japan, Ceratoisis 

 japonica, Std. and Ceratoisis paucispinosa ; the Philippines, Ceratoisis philippinensis ; 

 and the Kermadec Ishmds, Ceratoisis grandijiora, Std. and Ceratoisis nuda. 



Callisis, Verrill. 



It may be doubted if this genus difi"ers from Ceratoisis ; the only species, Callisis 

 jiexihilis, V. (Isisjlexihilis, Pourt.), is from the West Indies. 



Isidella, Gray. 



Taking Isidella neajwlitana (Koch) as the type, it is apparently only found in the 

 Mediterranean. 



Acanella, Gray. 



The principal area of the species of this genus would seem to be the Northern 

 Atlantic, where Acanella arbuscula, Y. Johns., is found oflf the Canaries and Madeira; 

 Acanella ehurnea (Pourt.), Sombrero Island ; and Acanella simplex, V., off" the Bermudas ; 

 besides other species described by Verrill, from the voyage of the " Blake ; " of which 

 Acanella normafii, V., occurs from Martha's Vineyard to the south coast of Iceland and 

 Greenland. Three species have been found in the Pacific Ocean, though at very wide 

 intervals from each other — Acanella chiliensis in the Messier Channel, Acanella rigida 

 off" Banda, and Acanella gregorii, Gray, off" Japan. 



Sclerisis, Studer. 



The only species of this genus, Sclerisis pulchella, Studer, was found at a depth of 

 597 fathoms, in lat. 35° 21' S., long. 175° 40'. 



Bathygorgia, Perceval Wright. 



The only species of this genus, Bathygorgia profunda, Perc. Wright, was dredged off" 

 the coast of Yokohama, in lat. 35° 41' N., long. 157° 42' E. 



Primnoisis, Wright and Studer. 



The species of this genus appear to be essentially Antarctic. Primnoisis ajitarctica, 

 Std., Primnoisis sparsa, Primnoisis ambigua, were found in comparatively shallow 

 water at Prince Edward Island and Kerguelen, but Primnoisis rigida was dredged from 

 deep water in the Atlantic Ocean, at Rio de la Plata, and Primnoisis (Isidella) capensis, 

 Std., off" the Cape of Good Hope. 



