4 From her most cunning hand escaped be;
cunning > clever, skilful
5 All dreadful portraits of deformity: 6 Spring-headed hydras, and sea-shouldering whales; 7 Great whirlpools, which all fishes make to flee;
whirlpool > {Some sort of large baleen-bearing whale, such as the blue whale: "The Whales and Whirlepooles called Balaenae" (Holland's Pliny, quoted in OED)}
8 Bright scolopendras, armed with silver scales;
scolopendra > {A fabulous sea-fish} armed > armoured
9 Mighty monoceroses, with immeasured tails.
monoceros > {Narwhal, sawfish, or swordfish; at any rate, a fish or fish-like creature having a single horn} immeasured > immense, vast
212.24
The dreadfull Fish, that hath deseru'd the name
2 Of Death, and like him lookes in dreadfull hew,
The griesly Wasserman, that makes his game
4 The flying ships with swiftnesse to pursew,
The horrible Sea-satyre, that doth shew
6 His fearefull face in time of greatest storme,
Huge Ziffius, whom Mariners eschew
8 No lesse, then rockes, (as trauellers informe,)
And greedy Rosmarines with visages deforme.