ANALYSIS. 



T. CRUSTACEANS : 



221. The Crabs 763 



222. The Common Edible or Blue Crab 775 



->-':!. The Lobsters 780 



224. The American Lobster 781 



225. The Cray Fishes, Astucus and Cambarus 812 



'226. The Shrimps and Prawns 816 



227. The Mantis Shrimps: Squillidffl 823 



228. The Amphipods 824 



229. The laopods : 826 



230. The Entomostracans 827 



231. The Cirripedia 828 



232. TheXiphosura 829 



Z. WORMS : 



233. The Annelids 831 



234. The Leeches 833 



Z. A. THE RADIATES : 



235. The Echinoderms 838 



236. The Coelenterates 841 



Z. B. THE POHIFEKS : 



237. The Sponges 843 



238. The Genus Spongia, and the American Commercial Sponges 846 



239. Injurious Sponges 860 



(761) 



