xiv CONTENTS. 



of colour to sea-bed Structural modifications of flat-fishes 



The plaice, sole, and turbot Difference in coloured 

 sides of ditto Modification of eyes of ditto The brill, 

 dab, halibut, turbot, &c. Conger-eel, John dory, and guard 

 fish Mud-fishes Modern study of fish Page 209 



CHAPTER XIV. 



CUTTLE-FISH, MOLLUSCA, ETC., OF MARINE AQUARIA. 



Victor Hugo's octopus Mr. Henry Lee on the octopus Huge 

 octopuses or cuttle-fish Fishermen's stories of ditto The 

 common octopus Structure of ditto Habits and food of 

 ditto Common sepia Internal bone of ditto Its micro- 

 scopical structure Common squid Pen of ditto Welsh 

 octopus Geological antiquity of cuttle-fishes Mollusca 

 for shallow water-tanks Limpets, chitons, &c. Structure 

 of chitons Young of ditto Key-hole limpet White 

 whelk Egg-cases of ditto Red whelk Venus' ear, or 

 Haliotis Nassa and Purpura Vegetable scavengers 

 Natica, Turitella, and Trochus Shell-less mollusca or sea- 

 slugs Aplysia, Doris, &c. Bivalve mollusca Their re- 

 productive powers The common mussel Oysters Their 

 usefulness in aquaria Young of ditto Food of ditto 

 Life-history of oysters American clams Species of 

 cockles Pectens or scallops Boring mollusca Sand 

 mussels Wood-boring mollusca Mactras, Tellinas, 

 Lima, Cyprina, &c. Ascidians Young of ditto Sea- 

 mats Structure of ditto Botryllus Clavelina, &c. 228 



CHAPTER XV. 



CRUSTACEA, ECHINODERMS, ANNELIDS, ETC., OF MARINE 

 AQUARIA. 



Animals as aquarium scavengers Hermit crabs Habits 

 and structure of ditto Battles of ditto for empty shells 



Spiny lobster, or crawfish Embryology of ditto 



