Cobra-di-Capello, 33. _See also Naja tripudians._ “ “ spectacled, used by Hindu snake-charmer, 229. _Cœlenterates_, poisonous species of, 269. _Cœlopeltis_, 22. “ _moilensis_, 23. “ _monspessulana_, 23. Cold, intense, toxicity of venom not diminished by, 166. Colombia, herons of, probably immune to snake-venom, 227. “ “ hunt young snakes for food, 226. Coloration of snakes, 15, 16. “ “ subject to biological laws of mimicry, 15, 16. _Colubridæ_, 3, 30, 57, 82, 100, 101-109. _See also Acanthophis_, _Aspidelaps_, _Boulengerina_, _Brachyaspis_, _Dendraspis_, _Denisonia_, _Diemenia_, _Elapechis_, _Elapognathus_, _Furina_, _Glyphodon_, _Homorelaps_, _Hoplocephalus_, _Micropechis_, _Notechis_, _Ogmodon_, _Opisthoglypha_, _Proteroglypha_, _Pseudechis_, _Pseudelaps_, _Rhinhoplocephalus_, _Rhynchelaps_, _Sepedon_, _Tropidechis_, _Walterinnesia_. _Colubridæ_ (sub-family _Elapinæ_). _See also Bungarus_, _Naja_, _Hemibungarus_, _Callophis_, _Doliophis_. “ resemblance to harmless snakes, 3. “ species of, bite rapidly produces general intoxication, 168. “ venoms of, absorption by digestive tract often without ill-effect, 180, 181. “ “ “ “ “ “ “ cause, 181. “ “ action on nervous centres profound, 185. “ “ affinity of scorpion poison to, 278. “ “ albumoses of, 162. “ “ destroy coagulability of blood, 179, 188, 189. “ “ dialyse slowly, 161. “ “ lethal effects on mammals, 170. “ “ minimum doses lethal for guinea-pig in twenty-four hours, 173. “ “ precipitation of anticoagulant substance in, 195. “ “ recovery rapid after non-lethal doses, 177. “ “ resistant to heat, 161. “ “ richness in neurotoxin, 249. Common rattle-snake, 125. _See also Crotalus durissus._ Congestin, poison from _Anemone scultata_, 271. Conjunctivitis caused by discharge into eyes of venom of spitting snake, 63, 64. Copperhead, 90. _See also Denisonia superba._ Coral-snake, 104. “ immunity from bite of, 238. “ venomous nature of, 108. “ _See also Elaps corallinus._ Coral or harlequin snake, 106. _See Elaps fulvius._ Cordier, D., cobra-bites treated with Calmette’s serum, 363. Cotes, E. C., on extraction of venom by charmers, 234. _Cottus_, 289, 290, 292. “ poison-apparatus of, 293. _Crabronidæ_, 285. “ stings of females of, toxic to other insects, nearly harmless to man, 285. _Crotalinæ_ (_Viperidæ_), 101, 109. “ characteristics of, 6. “ venoms of certain species of, non-coagulant, 191, 192, 193. “ _See Ancistrodon_; _Lachesis_. _Crotalus_ (rattle-snake), 110, 122. “ comparative toxicity of organs, 220. “ eggs of, rich in poison, 220. “ poison glands of, 148. “ venom of, alkaloids in, 160. “ “ comparison of toxicity by means of intra-cerebral injections, 186. “ “ ingestion causing death, 180. “ “ weak hæmolysing power possessed by, 199. “ _adamanteus_, venom of, dose lethal for rabbit, 175.