GENERAL CLASSIFICATION 149 



TABLE OP CRUSTACEANS. 

 Order 1. — Sessile-eyed Crustaceans. 

 Eyes sessile and immovable. 

 Wood-louse. Cephalooulus. 



Ligia. Amymone. 



Asellus. Daphnia. 



Cyamus (whale-louse). Lynceus. 



Shrimp. Osole. 



Caprella. Limulus [Apus, not the 



modem Limulus. H. E.]. 

 — • Cabgus. 



Cyclops (water-flea). Polyphemus. 



Zoea [Decapod larva. H. E.]. 



Order 2. — Staik-eyed Crustaceans. 

 Two distinct eyes, raised upon movable stalks. 



(1) Elongated tail, furnished with, swimming blades, or hooks or setae. 



Branohlopod. Pagurus (hermit-crab). 

 SquiUa. — 



Palaemon. Ranina. 



Crangon. Albunea. 



Palinurus (rook-lobster). Hippa (sand-crab). 



SoyUarus. Corystes. 



Galathea. Poroellana. 

 Cray-ftsh. 



(2) Tail short, without appendages, and applied to the lower surface 



of the abdomen. 



Pinnotheres. Dorippe. 



Leucosia. Plagusia. 



Arctopsis. Grapsus. 



Maia. Ocypode. 



— Calappa. 



Matuta. Hepatus. 



Orithyia. Dromia. 



Podophthalmus. Cancer. 

 Portunus. 



ANNELIDS. 

 (Class VIII. of the Animal Kingdom.) 



Oviparous animals with soft elongated bodies, with transverse rings ; 

 they rarely have eyes or a distinct head and are destitute of jointed legs. 



Arteries and veins for circulation ; respiration by gills ; a ganglionic 

 longitudinal cord. 



Observations. 

 We find in the annelids that nature is striving to abandon the type 

 of articulations which she always used in the insects, arachnids and 



