we may suspect that a perfect hand would have been disadvantageous for climbing; as the most arboreal monkeys in the world, namely ateles in america and hylobates in asia, either have their thumbs much reduced in size and even rudimentary, or their fingers partially coherent, so that their hands are converted into mere grasping-hooks.63

How would the previous sentence be correctly capitalized?
We may suspect that a perfect hand would have been disadvantageous for climbing; as the most arboreal monkeys in the world, namely Ateles in America and Hylobates in Asia, either have their thumbs much reduced in size and even rudimentary, or their fingers partially coherent, so that their hands are converted into mere grasping-hooks.63