INDEX 



209 



Perch, teeth of, 41. 



,, sexual difference in, 



100. 



eggs of, 112. 

 Phosphorescent organs, 162. 

 Pike, teeth of, 42. 



,, poison of, 158. 

 Pipe-fish, eggs of, 109. 

 Plagyodus, 95. 

 Plaice, eggs of, 113. 

 Poison organs, 154. 

 Pollack, feeding of, 81, 82. 

 Polyodon, ancient character 



of, 182. 

 Polypterus, external gill of, 



26. 



,, fins of, 58, 179. 

 ,, affinities of, 185. 

 Porcupine-fish, scales of, 30. 

 Protopterus, scales of, 29. 



, , summer sleep of, 



150. 



Psammosteus, affinities of, 202. 

 Ptemspis, affinities of, 199. 

 Pterichthys, affinities of, 200. 



a 



Kays, teeth of, 39. 

 Reed-fish, ancient character 



of, 179. 



Remora (see Echeineis). 

 Ribbon-fish, young of, 137. 

 Roach, scales of, 35. 



teeth of, 42. 



,, affinities of, 188. 



S. 



Salmon, colour, flesh of, 96. 

 , , sexual differences, 



100. 



,, fighting, 100. 

 ,, nest of, 115. 



Sand-smelts, masses of larvae 



of, 138. 



Saw-fish, weapon of, 43. 



feeding of, 86. 



Scales, forms of, 29, 33. 



,, method of counting, 



36. 

 Scams, delicate flavour of, 



85. 



Sea-horse, swimming of, 60. 

 ,, mouth of, 99. 

 ,, eggs of, 110. 

 ,, form of body, 165. 

 Serpent-head, overland jour- 

 neys of, 148. 



,, summer sleep of, 



152. 



Shark, Port Jackson, teeth of, 

 39, 173. 



,, scales of, 31. 

 ,, comb-toothed teeth of, 



41. 

 ,, Greenland, teeth of, 



41. 



5, spiny shagreen of, 41. 

 ,, phosphorescent, 162. 

 ,, primitive nature of, 168. 

 ,, first appearance of, 171. 

 ,, classification of, 171. 

 Skate, feeding of, 91. 

 eggs of, 111. 

 ,, poison organs of, 153. 

 ,, capture of food in, 94. 

 Skin, respiration by, 22. 

 Skip-jack, voracity of, 96. 

 Sole, transformation of, 133. 



,, affinities of, 189. 

 Spines, origin of, 45. 

 Stickle-back, voracity of, 96. 

 fighting of, 100. 

 nest of, 103. 

 care of young, 



105. 



short life of, 120. 

 migration of, 146. 

 Sting-ray, teeth of, 39. 



O 



