10 



FOULING OF SHIPS BOTTOMS : 



Key to Section A of Dry-Dockustg Report. 



1 



Barnacles. 



(1) Organisms with a Shell. 



(a) Conical shells with an opening at the top 



(" acorn barnacles ") . ... 



(6) Shells (formed from many plates) at the top 



a long fleshy stalk (" goose barnacles ") 



(c) Small but long tubular shells, lying flat or 



projecting upwards at the open end, often 

 coiled ....... 



(d) Paired shells (like mussels and oysters) . 



(2) Organisms with no Shell. 



(e) Bag-like forms or slimy rounded masses . 



Branching types : 



if) *SY?jQ^ stalks, dark brown, grey or white in colour, 

 sometimes ending in knobbed heads 



{g) Green, brown or red, often branched threads or 

 leafy growths, limp {i.e., lying flat in dry-dock) 

 and near water-line ..... 



The above key is sufficient for the identification of all the groups dis- 

 tinguished in Section A of the dry-docking report. 



Tube WORMS. 

 Molluscs. 



soft-bodied 

 Animals. 



Hydroids. 



Seaweed. 



