CONTENTS, 



INTRODUCTION. 



PAGE 



Adaptation of Food to Animals — Animal Manufacturers — Brigands — 

 Messmates — Mutualists — Theory of Spontaneous Generation ... xiii 



CHAPTER I. 



ANIMAL MESSMATES. 



Definition — Free Messmates— Fixed Messmates 1 



CHAPTER II. 



FREE MESSMATES. 



Found in all Classes — Fierasfers in Holothuridae — Pilot Fish — 

 Remora — Crustacean Messmates — Poisoning by Mussels — Pearl 

 Mussel, and small Crab — Dromiae — Turtle Crabs — Maorourous 

 Decapods — Hermit Crabs — Friendship of Pagurus and Anemone 

 — Isopods — Messmates on Whales — Molluscan Messmates — 

 Lerneans — Distomes— Messmates of the Echinodermata — Of 

 Sponges — Infusorial Messmates 4 



CHAPTER III. 



IXED MESSMATES. 



Cirrhipedes — Importance of Embryology — Recurrent Development 

 — Messmates, characteristic of the various Species of Whales 

 — Cirrhipedes on Sharks — Crustaoeans, Messmates on other 

 Crustaceans — Cirrhipedes . on Molluscs — Bryozoa — Fossil 

 Messmates — Messmates on Sponges — Spicules of Hyalonema — 

 Ophiodendrum 53 



