[435-20] It refers to his sin against Prospero.
[435-21] That is: “It sang my misdeed in a terrible bass.”
[435-22] This clause means: “My son sleeps in the ooze on the bottom of the ocean.”
[435-23] Mudded means buried in mud. Alonso threatens to drown himself.
[436-24] There are said to be poisons which will not work until a long time after a person takes them.
[436-25] For ecstasy, read fit of madness.
[437-1] Vanity probably means fine display.
[437-2] With a twink means in the twinkling of an eye.
[437-3] Mop means chattering.
[437-4] Mow means making faces. Mop and mow were words applied to such chattering and grinning as a monkey makes.