ANALYSIS, 



W.— MOLLUSKS IN General. Page. 



205. The Guttles: Cephalopoda 687 



206. The Sea-snails: Gasteropoda 693 



207. The Wing-shells : Pteropoda 702 



208. The Tusk-shells: Solenoconoha 703 



209. The Bivalves: LamelUbranchiata 703 



X.— A Contribution to the Life-history of the Oyster. 



210. Outline Sketch of the Coarser Anatomy of the Oyster 711 



211. The Minute Anatomy of the Oyster 715 



212. Sex of the American and European Oysters 719 



213. New Methods of Distinguishing the Sexes and of Taking the Eggs of the Oyster 722 



214. Kate of Growth of Ostrea virginica 725 



215. The Food of the Oysters 729 



216. The Cause of the Green Color of Oysters .'. 735 



217. Local Variations in the Form and Habits of the Oyster 742 



218. The Oyster Crab as a Mess-mate and Purveyor 744 



219. Physical and Vital Agencies Destructive to Oysters.... 746 



220. Natural and Artifloial Oyster Banks 750 



(685) 



