108 



THE FAMILY AQUARIUM. 



suckers are developed. Now and then you may perceive 

 them in the gravel, near low water. They merit all the 

 space they will occupy, so do not omit them. 



The Oyster ; the Sea-Mussel ; the Murex ; the Anomia ; 

 the Bullas ; the Chitons ; a species of Sea Wood-louse ; 

 the Modioles ; all the Nudihranch or naked-gilled, and 

 most of the Tedibranch species, may be placed in the 

 Aquarium with advantage. The sand-burrowing bivalves, 

 as Madra^ Pallastra^ Venus, etc. ; the Gastrochcena 



Sea Cucumber (Hoiothuria.) 



and Saxicava, burrowers in stone ; the Whelk ; the Cowry ; 

 the Ascidicc ; the Naticce ; the Cynthia ; the little Kissoce ; 

 the Acmcea; the Phasianella ; the Calyptrcea, or Cup and 

 Saucer ; will all prove welcome additions. 



Annelides. — The tubular cells of the Ser^ulcEj formed 

 of hard shell, out of which rise the dashingly gay colored 

 tentacles, deserve appreciation. The S. Contortu'plicata 

 has a " stopper " of white sometimes, but sometimes of a 

 glowing orange color, which accompanies the fan-like 

 apd feathery group of tentacles that serve the animal for 



