LIST OF ILLUSTRATIONS. 15 



" P A6B 



47. Water-flea. Daphnia pulex. Female . . . .187 



48. Hydra viridis . * . 190 



49. Stings of Hydra . 191 



50. Trilobite. Trinucleu* fimbriatus 196 



51. Paradoxides Tessini 196 



52. Agnostus pisiformi. Upper side . . 197 



53. Underside . . 197 



54. King-Crab. Limulus. Under side . . . .201 

 56. Trilobite. Head-shield and Tail-shield of Phillipsw . 205 



56. Eye of Trilobite. Asaphus caudatus .... 207 



57. Fossil King-Crab. Belinurus trilolitioides . . .211 



58. Trilobite. Prestwichia . . . . . .. .211 



59. Larva of King-Crab 211 



60. Larva of Trilobite 211 



61. Shrimp Parasite. Bopyrus crangorum. Upper side . 213 



62. Under side of ditto 213 



63. Serolis Fabricii, with eye magnified . . . .214 



