Fig. 64.--_Furina occipitalis_ 99 Fig. 65.--Skull of _Elaps marcgravii_ 101 Fig. 66.--_Elaps fulvius_ (Harlequin Snake) 105 Fig. 67.--Head and Skull of _Crotalus horridus_ (Horrid Rattle-snake) 109 Fig. 68.--_Ancistrodon piscivorus_ (Water Viper) 110 Fig. 69.--_Lachesis lanceolatus_ (Fer-de-Lance) 112 Fig. 70.--_Lachesis neuwiedii_ (Urutù) 116 Fig. 71.--_Sistrurus catenatus_ (Prairie Rattle-snake) 121 Fig. 72.--A. Horny appendage (rattle) of a _Crotalus horridus_ 122 B. Horny appendage, longitudinal section 122 C. Separated segments of the appendage 122 Fig. 73.--_Crotalus terrificus_ (Dog-faced Rattle-snake) 123 Fig. 74.--_Crotalus scutulatus_ (Texas Rattle-snake) 126 Fig. 75.--_Crotalus confluentus_ (Pacific Rattle-snake) 128 Fig. 76.--_Crotalus cerastes_ (Horned Rattle-snake) 130 Fig. 77.--Skull of _Hydrus platurus_ 132 Fig. 78.--_Hydrus platurus_ 133 Fig. 79.--_Hydrophis coronatus_ 134 Fig. 80.--_Hydrophis elegans_ 135 Fig. 81.--Skull of _Distira_ 137 Fig. 82.--_Enhydrina valakadien_ (_E. bengalensis_) 138 Fig. 83.--Skull of _Platurus colubrinus_ 139 Fig. 84.--_Platurus laticaudatus_ (_P. fischeri_) 140 Fig. 85.--Collecting venom from a _Lachesis_ at the Serotherapeutic Institute of São Paulo (Brazil) 154 Fig. 86.--Chloroforming a Cobra in order to collect venom at Pondicherry (first stage) 155 Fig. 87.--Chloroforming a Cobra in order to collect venom at Pondicherry (second stage) 157 Fig. 88.--Collecting Cobra-venom at Pondicherry (third stage) 158 Fig. 89.--Mongoose seized by a Cobra 225 Fig. 90.--Indian Snake-charmer at Colombo (Ceylon) 230 Fig. 91.--Indian Snake-charmer at Colombo (Ceylon) 231 Fig. 92.--Musical instrument used by Indian snake-charmers to charm Cobras 232 Fig. 93.--Vaccinating a horse against venom at the Pasteur Institute, Lille 244 Fig. 94.--Aseptically bleeding a horse, vaccinated against venom, in order to obtain antivenomous serum, at the Pasteur Institute, Lille 245 Fig. 95.--Technique of injecting antivenomous serum beneath the skin of the abdomen 264