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Analysis of Part V.
Crustaceans.
The crabs; The common edible or blue crab; The lobsters; The American lobster; The crayfishes; The shrimps and prawns; The mantis shrimps; The Amphipods; The Geopods; The Entomostracans; The Cirripedia; The Xiphosura.
Worms.
The Annelids; The leeches.
Radiates.
The Echinoderms; The Coelenterates.
Porifers.
The sponges; The genus Spongia; and the American commercial sponges; Injurious sponges. 

Notes are given mainly upon the distribution, habits, etc., of those species which are of greater or less economic importance to man, the lobster being discussed at considerable length.