viii Table of Contents 



PAGE 



Tlie Genus StyloceUus Westwood ........... 88 



The Genus Miopsalis Thorell ............ 99 



The Genus Ogovia nobis ............. 99 



The Genus Pettalus Thorell 101 



The Genus Purcellia nobis ............ 105 



The Genus Siro Latreille ............. 107 



The Genus Parasiro nobis ............ 110 



II. The Order Ricinulei (the Family Cryptostemmatoid.e) . . . . . . .114 



A. Historical Introduction ............. 114 



B. On the General Structure of the Order . . . . . . . . .11-5 



1. The Dermoskeleton . . . . . . . . . . . . .115 



■2. The Cephalothorax 116 



3. The Abdomen .............. 118 



4. The Coupling of the Abdomen with the Cephalothorax . . . . . .121 



5. The Limbs 123 



6. The Mouth 126 



7. Organs of Sense .............. 130 



8. Organs of Respiration ............. 131 



9. External Sexual Characters. Stages of Development . . . . . .134 



10. The Systematic Position of the Family Cryptostemmatoida? and of the Order Ricinulei 136 



C. Pars Systematica .............. 143 



Characterization of Arachnida micrura . . . . . . . . . .143 



Characterization of the Order Ricinulei and the Family Cryptosteunnatoid» . . .144 



Explicatio terminorum nonnullorum . . . . . . . . . .145 



The Genus C'ryptostemma Guerin . . . . . . . . . . .146 



The Genus Cryptocellus Westwood . . . . . . . . . . .154 



List ok Books ................ 158 



Explanation of Nine Plates ............. 164 



Index 1''9 



Pl.\tes I to IX at end of book. 



