80 



Table of the Regions of Depth of the British Seas. 



Characteristic Plants. 



Characteristic Animals 



I. 



Littoral Zone. 



The tract between tide 

 marks. 



First Subregion. 



Fucus canaliculatus. 



Seeond Subregion. 

 Lichina. 



Third Subregion. 

 Fucus articulatus. 



Fourth Subregion. 

 ' Fucus serratus. 



Patella ni/gata throughout. 



First Subregion. 

 Littorina rudis. 



Second Subregion. 

 Myt il us edulis. 



Third Subregion. 



Littorina littorea. 

 Purpura Iqpillus. 



Fourth Subregion. 

 L itt nr in a n er it oides, 

 Trochi. 



Iiimanthalia lorea. 



II. 



Laminarian Zone. 



Tract between low-water 

 mark and 15 fathoms. 



Subregio superior. 

 Laminarix. 

 Fhodomenise. 

 Bclcsseria'. 



Trochus Ziziphinus. 

 Lacuntc. 



Patella pellucida. 

 Patella ccendea. 



III. 



Region of Corallines. 



15 to 50 fathoms. 



IV. 



Region of deep Sea. 

 Corals. 



50 fathoms to beyond 100. 



Subregio inferior. 



Missoss. 



Nullipora. 







Hydroid zoophytes throughout. 





Subregio superior. 





Fttsus antiquus. 



? 



Pullastra virginea. 





Pecten maximus. 





Subregio inferior. 





Pleurotoma teres. 





Turbinolia millctiana. 





Subregio superior. 





Necenc. 





CeUeporsz. 





Brachiopoda. 







Ditrupa. 





Subregio inferior. 





Astrophyton. 





('idaris. 





Oculina. 





Primvoa. 



Som synes, har Forbes äfven subregioner i sitt system. Hur 

 han närmare utmäjslar dessa, framgår kanske bäst af hans tabell 

 p. 373: 



