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



Mopsea, Lamarck. 



All uncertainty as to the distribution of the two species of this genus have been set 

 at rest by the discovery of Mopsea dichotoma (Lin.) at Port Jackson and of Mopsea 

 encrinula (Lamk.) off East Moncoeur Island, Bass Strait, and North-West Australia. 



Acanthoisis, Wright and Studer. 

 The only species of this genus [Acanthoisis fiabellum) was found off Port Jackson. 



Isis, Linneus. 



While Isis hippuris, L., occurs in the Pacific Ocean, Amboina being one of its 

 habitats, it is curious that no trace of the species occurs in the collection, though large 

 collections were made at Amboina ; as to the species described by Steenstrup, the 

 habitats given — " Indian Ocean ; " " Seas of America," &c. — leave the exact localities still 

 uncertain. There are specimens in the Bern Museum from Manila, and Ellis and Solander 

 record it from the southern coast of Sumatra. 



Family III. Primnoid^. 



Callozostron , Perceval Wright. 



The only species of this genus (Callozostron mirabilis, Perc. Wright) was dredged at 

 lat. 65° 37' S., long. 79° 49' E., in the Antarctic Sea, the most southerly dredging made 

 during the cruise of the Challenger. 



Calyptrophora, Gray. 



Both species of this genus come from the Pacific Ocean ; Calyptrophora japonica, 

 Gray, occurs at Japan, and off the Fiji Islands ; there is also a specimen in Paris, labelled as 

 from the Indian Ocean (Bourbon) ; Calyptrophora wyvillei was found north-east of the 

 Kermadecs. 



Calypterlnus, Wright and Studer. 

 The single species of this genus {Calypterlnus allmani) was found off the Eeefs, Fiji. 



Stachyodes, Wright and Studer. 

 The only species, Stachyodes regularis, was found off the Kermadecs. 



