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7. Boring in and Removal of Solids. 



For shelter, or to increase capacity of shell &c. Not for 

 obtaining food, for which see Section J. 



Plants. 



Examples. Some Algae and Fungi. 

 Animals. 



Examples. Porifera: Cliona. 



Echinodermata : Strongylocentrotus lividus. 



Annelida. 



Crustacea : Eupagurus. 



Pelecypoda : Pholas, Saxicava, Teredo. 



Gastropoda : Patella, Nerita, Conns. 



8, FIXATION. 



Exclusive oi: such as are used for Climbing or Direct Absorp- 

 tion by Plants. 



On Solids. 

 Plants. 



Example. Algse : Laminaria. 

 Animals. 



Examples. Rhizopoda, by moulding of shell to support. 

 Infusoria : Vorticella. 

 Porifera. 



Hydrozoa, by hydrorhiza. 

 Anthozoa, by expanded base. 

 Crustacea : Cirripedia. 

 Bryozoa. 

 Brachiopoda. 



Pelecypoda : Oyster, Mytilus, Anomia. 

 Gastropoda: Vermetus. 

 Urochorda: Ascidia. 



On Semi-solids. 

 Animals. 



Examples. Porifera : Hyalonema. 

 Hydrozoa ? 



Anthozoa: Cerianthus?, Pennatula. 

 Brachiopod: Lingula. 



