248 A 3Ionograph of Scytonotus. 



PLATE IX. 



Scytonotus granulatus. 



Fig. 60. — Seventh segment of male, ventral face, showing the genitalia 

 in situ. 



Fig. 61. — Same, the distal joints of genitalia bent doAvnward (back- 

 ward), showing the concavities of the expanded basal joint, in which 

 the distal joints are partially concealed. 



Fig. 62. — Diagrammatic cross-sections of the eighth segment of the 

 two sexes. 



Polydesmus canadensis. 

 Fig. 63. — Diagrammatic cross-sections of the two sexes. 



Scytonotus granulatus. 



Fig. 64. — Three terminal segments, with anal valves and anal scale, 

 lateral view. 



Fig. 65. — Dorsal view of entire animal. 



Fig. 66. — Segments 6-11 of female, showing the atrophied carinae of 

 the eighth and ninth segments. 



Fig. 67. — Terminal segments ventral view. 



Fig. 68. — Terminal segments of the six-legged larva. 



Fig. 69. — Barbed hairs from the six-legged larva. 



Fig. 70. — Six-legged larva. 



Fig. 71. — Clawof .same. 



