XU LIST OF WOODCUTS. 



PAGE 



Fig. 19. Astcvcus fluviatilis. Muscular tissue . . . . 91 

 „ ,, Muscles op cuela .... 93 

 ,, „ Articulation of ardomtnal so- 

 mites .97 



,, ,, Muscular system .... 100 



,, ,, Nerve fibres 102 



,, ,, Nerve ganglia .... 103 



,, ,, Nervous system . . . . 104 



,, ,, Olfactory and auditory organs 114 



,, ,, Auditory sac 117 



,, ,, Structure of eye . . . . 119 



,, ,, Diagram of eye .... 123 



,, ,, Female reproductive organs . . 129 



„ ,, Male reproductive organs . . 130 



,, „ Structure of ovary . . . . 131 



,, ,, Structure of testis . . . 132 



,, ,, Spermatozoa » . . . . 134 

 ,, ,, The LAST THORAcre steujSUm in the 



male and female , . .136 



,, ,, Transverse section of abdomen 142 



,, ,, Abdominal appendages . . . 141 

 ,, ,, Connection between thorax and 



abdomen 151 



,, ,, Cephalothoracic sterna and en- 



dophragmal system . . . 153 

 ,, ,, Ophthalmic and antennulary so- 

 mites 156 



,, „ The rostrum 157 



,, ,, A Segment of the endophragmal 



SYSTEM 159 



J, „ Longitudinal section of cepiialo- 



THORAX 162 



44. „ „ The third maxillipede . . .164 



