couched > {Lying down, with head raised: a term in heraldry} beaver > visor (strictly, the lower part of face-guard of helmet)
7 From flaming mouth bright sparkles fiery red, 8 That sudden horror to faint hearts did show; 9 And scaly tail was stretched down his back full low.
full > exceedingly, very
107.32
Vpon the top of all his loftie crest,
2 A bunch of haires discolourd diuersly,
With sprincled pearle, and gold fully richly drest,
4 Did shake, and seem'd to daunce for iollity,
Like to an Almond tree ymounted hye
6 On top of greene +Selinis+ all alone,
With blossomes braue bedecked daintily;
8 +Whose+ tender locks do tremble euery one
At euery little breath, that vnder heauen is blowne.
6 Selinis > Selinis 1590, 1609 8 Whose > Her 1590
1 Upon the top of all his lofty crest
crest > {Apex of the helmet}
2 A bunch of hairs discoloured diversely
hairs > plumes, perhaps horsehair plumes discoloured diversely > [rendered (dyed) in various colours]