NDEX. 
V. RODENTIA—(continued). 
Gen.—Arvicola, 128 
Groups of Arvicola.—Fiber, 128 
Arvicola, 128 
Georychus, 129 
Otomys, 130 
Dipus, 130 
Gen.—Helamys or Pedetes, 131 
Spalax, 131 
Bathyergus, 132 
Geomys, or Pseudostoma, or Ascomys, 132 
Diplostoma, 132 
Castor, 133 
Myopotamus, 134 
Hystrix, 134 
Subgen. of Hystria.—Hystrix, 135 
Atherubus, 135 
Eretison, 135 
Synetheres, 135 
Gen.—Lepus, 136 
Subgen.—Lepus, 136 
Lagomys, 137 
Gen.—Hydrocherus, 138 
Cavia or Ancema, 138 
Subgen.—Kerodon, 139 
Gen.—Chloromys or Dasyprocta, 139 
Celogenys, 139 
VI. EDENTATA, 140 
Tribe 1, Tardigrada, 140 
Gen.—Bradypus, 141 
Acheus, 141 
Cholepus, 142 
Megatherium, 142 
Megalonyx, 143 
Tribe 2, Edentata Ordinaria, 143 
Gen.—Dasypus, 143 
Subgen.—Cachichamus, 145 
Apara, 144 
Encoubertus, 144 
Cabassous, 145 
Priodontes, 145 
Clamyphorus, 145 
Gen.—Orycteropus, 146 
Myrmecophaga, 146 
Manis, 147 
Tribe 3, Monotremata, 148 
Gen.—Kchidna or Tachyglossus, 148 
Ornithorhynchus or Platypus, 149 
XXXVIi 
