36 POPULAR HISTORY OF THE AQUARIUM. 



FiLSiis corneus, Natica glaucina, and Nassa reticulata, which 

 are also inhabited by Hermit Crabs. It is also said that, 

 unitedly growing on the rim of the aperture of the shell, 

 they form an extended or overhanging ledge, which enlarges 

 the cavity in which the hermit dwells, and if so, prolongs the 

 period before he will be obliged to seek a fresh and more 

 commodious home. 



CORYNE PUSILLA. 



This is a minute branching Zoophyte, with a bright red 

 star-like polype at the top of each branch. It is found on 

 stones and seaweeds between high and low water, but the 

 branches are so thin and the star-heads so small that it 

 would only be seen under favourable circumstances. It 

 creeps along the surfaces of the stone or seaweed to wliich 

 it adheres. Its motions are slow ; but it can at will bend 

 any one of its horny, wrinkled, transparent branches, or coil 

 any one of the tentacula which surround the polypes at 

 their heads. 



CORYNE SESSILIS 



Resembles an upright club, with circles of ball-shaped 

 heads, on slender stems, projecting from it at intervals : 

 these are the polypes, each about the sixteenth of an inch in 



