THE MARINE AQUARIUM. 73 
Crustacea are lively and interesting, but of course 
small species, or small specimens of large species are the 
most suitable. The Soldier crabs (Pagurus) and the 
Swimming crabs ( Portunus ) are eminently suitable, so is 
the pretty Strawberry crab, Eurynome aspera, and the 
interesting Broad-claw Porcellana platycheles. Shrimps 
and prawns may be used freely ; they are lively creatures, 
“3 CARCINAS MANAS. 
and much more beautiful when seen in motion, gliding 
about like ghosts, than would be imagined by any one 
judging from the appearance of specimens on the table. 
Annelides afford us the interesting serpulas, some pretty 
sea-worms, and the terebellas, all easy of preservation, 
and remunerative of the attention bestowed upon them. 
Zoophytes.—This is the division from which the most 
prominent attractions of the tank are derived. Of these 
