ANALYSIS. 



T. CRUSTACEANS: Pa i e - 



221. The Crabs 763 



222. The Common Edible or Blue Crab 775 



223. The Lobsters 780 



224. The American Lobster 781 



2'25. The Cray Fishe?, Astacus and Cambarus 812 



226. The Shrimps and Prawns 816 



227. The Mantis Shrimps : Squillida) 823 



228. The Amphipods 824 



229. Thelsopods 826 



230. The Entouiostracans 827 



j:U. 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 POKIFERS : 



237. The Sponges 843 



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



239. Injurious Sponges 850 



(761) 



