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,
CARCINAS MÆNAS.
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
