GEOGRAPHICAL D I S T K F B U T I N . 



I SHALL adopt here the same general plan as in the corresponding sections in the two 

 preceding parts of the Eeport. 



The track of the Challenger round the wurhl has been divided into a series of com- 

 paratively short stages, so as to show roughly the localities between which the different 

 observing Stations lie. These stages are arranged in the order in which they were 

 traversed by the expedition, and consequently the Stations are in chronological order, 

 and the lists of species occur in the order in which they were collected. The chief 

 objects of this arrangement are to show — (l) the apjiroximate positions of the localities 

 at which Tunicata were obtained, and (2) the list of species from each Station. As 

 tow-nettings were frequently taken at spots which were not numbered as Stations, the 

 date has in the case of all localities been placed first — otlier particulars following in 

 those cases in which they are known. 



In the first traverse of the North Atlantic from England liy the Canary Islands to 

 the West Indies, and then north to Halifax, Nova Scotia, no surfoce Tunicata were 

 <^ollected. 



In the return traverse, between Bermuda and the Canary Islands : — 



June 25, 1873; Station G9; lat. 38' 23' 0" N., long. 37' 21'0" W.; surf. temp. 71°. 

 Pyrosoma sjiinosurn, n. S23., one specimen. 



Between the Canary Islands and Bahia, Brazil : — 



August 16, 1873; Station 100; lat. 7° l'0"N.,long. 15' 55'0" W.; surf temp. 79°. 



Pyrosoma atlanticum (?), one small colony. 

 September 1, 1873 ; Station 112 ; hit. 3° 33' S., long. 32° IG' W. ; surf. temp. 78°. 



Pyrosoma giganteum, two small colonies. 



Between Bahia, Brazil, and the Cape of Good Hope : — 

 September 20, 1873; off Bahia. 



Pyrosoma giganteum (?), two small colonies. 



(ZOOL. CHALL. EXP. — TART I.XXVI. 1888.) Gggg 14 



