24 



THE VOYAGE OF II. M.S. CHALLENGER. 



two genera have been hitherto observed at depths greater than 1000 fathoms, viz.. 

 Sealpellum and Verruca. The list shows very clearly that there are no deep-sea 

 genera, for even of the two genera ranging lowest in depth, species are known from 

 shallow water. 



Though unquestionably by far the greater part of the known Cirripedia are shallow- 

 water species, and though some of the species are capable of existing at a considerable 

 variety of depth, as for instance Sealpellum stroemii, Sars, found at 83 and also at 516 



