Venomous snake
Belcher's sea snake ("Hydrophis belcheri"), which many times is mistakenly called the hook-nosed sea snake ("Enhydrina schistosa"), has been erroneously popularized as the most venomous snake in the world, due to the first edition of Ernst and book, "Snakes in Question: The Smithsonian Answer Book", published in 1996.
Prominent venom expert Associate Professor Bryan Grieg Fry has clarified the error: "The hook nosed myth was due to a fundamental error in a book called "Snakes in Question". In there, all the toxicity testing results were lumped in together, regardless of the mode of testing (e.g., subcutaneous vs. intramuscular vs. intravenous vs. intraperitoneal). As the mode can influence the relative number, venoms can only be compared within a mode. Otherwise, it's apples and rocks." Belcher's sea snake's actual LD (recorded only intramuscularly) is 0.24 mg/kg and 0.155 mg/kg. Studies on mice and human cardiac cell culture show that venom of the inland taipan, drop by drop, is the most toxic among all snakes.
Eastern brown snake
The eastern brown snake ("Pseudonaja textilis"), often referred to as the common brown snake, is an extremely venomous snake of the family Elapidae, native to eastern and central Australia and southern New Guinea. Considered the world's second-most venomous land snake after the Inland Taipan and based on its value (subcutaneous) in mice, it is responsible for about 60% of snake-bite deaths in Australia. First described by André Marie Constant Duméril in 1854, the adult eastern brown snake is a slender snake up to 2 m (7 ft) long with variable upperparts that can be various shades of brown, ranging from pale brown to almost black. Its underside is pale cream-yellow, often with orange or grey splotches.