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"An Amphipod (Caprella linearis). The two anterior thoracic segments are fused to the head; he abdomen is greatly reduced and without appendages; the fourth and fifth thoracic segments bear only respiratory plates." -Thomson, 1916

Amphipod

"An Amphipod (Caprella linearis). The two anterior thoracic segments are fused to the head; he abdomen…

The class of crustacea is divided into two sub-classes, Entomostraca and Malacostraca. The first, Entomostraca, contains the fairy-shrimps (Branchipus). A simple Crustacean, the fairy shrimp body is distinctly separated into head, thorax, and abdomen. This diagram shows parts of the fairy-shimp, (b) brood-pouch, (e,e') compound and simple eyes, (f) paddle-shaped feet, (h) tubular heart, and (i) intestine.

Fairy-shrimp

The class of crustacea is divided into two sub-classes, Entomostraca and Malacostraca. The first, Entomostraca,…

The larger, more useful and more familiar Crustacea belong to the subclass Malacostraca. It comprises such animals as the shrimps, crayfish, lobsters, crabs, and a number of other forms. The simplist of these are the opossum-shrimps (Mysis americana). In general appearance they resemle crayfishes or prawns. They are readily distinguished by the two-branched thoracic feet.

Shrimp

The larger, more useful and more familiar Crustacea belong to the subclass Malacostraca. It comprises…