106 THE STOCK. 



2 Magus Top Trochus magus 

 1 Nerit Natica Alderi 



1 Squin Pecten opercularis 



1 Pholas Pholas parva 



1 Pisa Pisa tetraodon 



1 Cleanser Crab Portunus depurator 



1 Ebalia Ebalia Pennantii 



1 Hermit (small) Pagurus ? 



8 Lobster-prawn Athanas nitescens 



1 Brittle-star OpMocoma rosula 



I Eyed Cribella Crihella oculata 



'li Scarlet Sunstar Solaster papposa 



1 Birdsfoot Star Palmipes memhranaceus 



3 Gibbous Starlet Asterina gibhosa 

 1 Purple tipped Urchin Echinus miliaris 



7 Scarlet Madrepore ) d 7 ? ;;• 



(£ Til? 1. X [ Balanophyllia reaia 



(irom Iliracombe) ) ^ " ^ 



8 Cloak Anemone Adamsia palliata 



Thus there were nearly a hundred animals in this 

 Tank ; a number which I found far too great ; for 

 though they did not crowd the vessel at all apparently, 

 nor seem disproportioned to the space they occupied, 

 it became evident that the exhaustion of the oxygen 

 of the water went on more rapidly than it could be re- 

 newed, either by the evolution from the living plants, 

 or by the combination with this of artificial aeration, 

 by allowing two or three gallons a day to drip from a 

 vessel suspended over the Tank at the height of about 

 four feet. 



Por about ten days the animals appeared pretty 

 well ; a little diminution occuring from the assaults of 

 the predatory species on their weaker fellows. Then 



