Division PODOPHTHALMATA, or Stalk-eyed Crustaceans.

Order Stomapoda—Anterior appendages directed towards the mouth.

Order Schizopoda—Cleft-footed Crustaceans.

Order Decapoda—Ten-footed Crustaceans.

Sub-order Macrura—Great-tailed. Lobsters, &c.

Sub-order Brachyura—Short-tailed. Crabs.

Class ARACHNOIDEA.

Order Scorpionidæ—Scorpions.

Order Araneidæ—Spiders.

Order Acarina—Mites.