1878.] 'lightning' and 'porcupine' expeditions. 395 



Second Cruise. 

 Off the South of Ireland. 



Dredgings were made at all the sounding-stations in this cruise. 



Third Cruise. 

 North of the Hebrides to the Faroe Isles. 



Not many deep-sea dredgings were made during the third cruise, 

 although soundings were taken at all the stations. 



