LIST OF WOODCUTS. 



Fig. 45. 



„ 46. 

 „ 47. 



49. 

 50. 

 51. 

 52. 

 53. 

 54. 

 55. 

 56. 

 57. 

 58. 

 59. 

 60. 



61. 



62. 



63. 

 64. 

 65. 



67. 



Astacus Jtuviatilis. The first and second maxilli- 



PEDES 166 



,, „ The second ambulatory leg . 169 



„ ,, The mandible and maxillje . . 171 

 ,, The eye-stalk, antennule, and 



antenna 172 



,, ,, Blood corpuscles . . . . 176 



,, ,, Epithelium 178 



,, „ Connective tissue . . . . 179 



„ ,, Muscular, tissue .... 181 



,, „ Muscular tissue . . . . 182 

 „ ,, Nerve ganglia . . . .188 



,, „ Nerve fibres 189 



„ „ Cuticular tissue . . . .191 

 ,, „ Sections of embryos . . . . 208 

 „ ,, Earlier stages of development 210 

 ,, ,, Later stages of development . 216 

 ,, „ Newly hatched young . . . 220 

 Comparative views of the cara- 

 pace, third abdominal somite, 

 and telson .... 233 

 Comparative views of the first 

 and second abdominal appen- 

 dages OF THE MALE . . . 245 



Cambarus Glarkii 248 



Parastacus brasilieiisis 250 



Astacoides madagascarensis 251 



Diagram of the morphological relations ok the 



Astacidas 253 



Homarus vulgaris 258 



' Parastacus. 



Nephrops. }-Podobranchi*e 259 



Palcemon. 



torrentium. 

 nobilis. 



torrentium. ' 

 nobilis. 



