( J4 THE MARINE AQEARIUM. 



funny hermit crabs (two species), lobsters and shrimps, 

 while the salt-water fish are more varied in form and 

 color than those found in ponds and rivers. 



The vessels in both cases are, of course, the same, 

 except as to Mr. Warrington's tank, which is made espe- 

 cially for use as a marine Aquarium. And Mr. Hibberd 

 very truly says, " It is also important to bear in mind 

 that marine stock invites the use of the microscope in 

 a greater degree than river specimens, and a llat-sidcd 

 vessel is the only one which affords proper facilities for 

 the application of a magnifier to its contents." The 

 water, also, in a marine tank does not need to be so 

 deep as that in a fresh-water one, that is to say, all 

 of our stock', anemones etc., except fish, will thrive just 

 as well in a shallow vessel as in a deeper one ; and as 

 we intend to imitate the little pools left in the rock by 

 the receding tide, we can have for that purpose the cir- 

 cular glass pans used for milk in dairies. Still, if we 

 intend to keep fish of any size, we must have a deeper 

 vessel — and an oblong tank, holding about eight or tea 

 gallons, will be found the best, for though circular vessels 

 will answer pretty well for fresh-water Aquaria, marine 

 stock docs not look well in them. 



The bottom of our marine tank can be made of the 

 same material as that used for a fresh-water one, but 

 will not need to be made so carefully, as we are not 

 going to plant our vegetation in it, and shall not, there- 

 fore, require fine sand below and pebbles above; and it 

 can be made entirely of pebbles or shells. The little 

 golden and pink shells that we pick up in profusion all 



