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



In tlic North Pacific the following five genera and thirteen species were obtained : — 



Pyrosoma elegans (?). 



sp. 

 Doliolum affine. 



challengeri. 

 Salpa cordiforviis-zonaria. 

 runcinata-fusiformis. 

 democratica-mucronata. 

 nitida. 

 cylindrica. 

 costata-tilesii. 

 hexagona. 

 Cyclosalpa pinnata. 

 Octacnemus hythius. 



In the seas round the southern end of South America the following two genera and 

 six species were collected : — 



Doliolum ehrenbergi. 



sp. (blastozooid). 

 Salpa democratica-mucronata. 

 cordiformis-zonaria. 

 echhiata. 

 I'uncinata-fusiformis. 



The North Atlantic and the two divisions of the Pacific Ocean have the longest lists, 

 but on the whole the numbers of genera and species are fairly equally distributed. 

 Salpa is the only genus which occurs in all the divisions. 



The table given below shows at a glance the distribution of any species, genus, or 

 family in the seven great areas — the North Atlantic, the South Atlantic, the Southern 

 Ocean, the seas of the Malay Archipelago, the North Pacific, the South Pacific, and the 

 seas round the southern end of South America. The last district, which includes 

 portions of the South Atlantic and of the South Pacific, has been adopted because of 

 the difficulty of separating the specimens collected around Cape Horn into an east 

 coast and a west coast series. 



