OCEAN GAUDEXS ; 



at a first glance, and have characteristics that well 

 repay the labour of persevering observation. I 

 should always place a few in an Aquarium. 



The common Limpet {Fatella vulgatd) has a 

 power, which appears extraordinary when the soft 

 substance of its body is considered, of excavating, 

 more or less deeply, a portion of the rock which it 

 makes its home. It is supposed to leave its hollow 

 in the night, returning infallibly to its home in the 

 morning. This habit might be watched in an 

 Aquarium, and, if verified, a very interesting fact 

 would be established, which at present remains 

 somewhat doubtful, although Mr. Lukis, of Guern- 

 sey, marked a Limpet, and found it return to its 

 haunt. These creatures belong to the order named 

 Cyclohranchiata^ from the breathing apparatus 

 being arranged in a circle round the body. The 

 pretty British shell, vulgarly called the Ark of 

 Noah, but which is the Area tetagrona, should be 

 tried in Aquaria, as well as the elegant Heart-shell 

 of the beautiful genus Isocardia ; the movements 

 and habits of the latter, as described by the E^ev. 

 J. Bulwer, being very curious and interesting. 



The pretty little Cowry is an object that must 

 not be passed over in silence, when treating of 

 objects fitted for the marine Aquarium, although, 



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