अन्वयः

राक्षसाः Rakshasa, दीनाः desperate, कपिभिः even monkeys, व्याप्तम् spread over, कृत्स्नम् dark, प्राकारपरिखान्तरम् entire area from the boundary and moat, नानरीकृतम् filled with monkeys, प्राकारम् boundary, ददृशुः saw, राक्षसाः Rakshasas, भयम् fear, आगताः reached, हाहाकारम् making noise, प्रकुर्वन्ति converted to defensive walls.

M N Dutt

The space between the well and the moat all was flooded with monkeys. And the distressed Rākşasas saw the wall thronging with monkeys; and thereat exclaiming “Alas” “Alas,” the Rāks asa were extremely terrified. *A translator cannot help feeling of disappointment at the difference, to the disadvantage of English-between Sanskrit and English. The original for 'thronging with monkeys' is a verbal attributivevanarikrita-lit. monkeyed.

Summary

The Rakshasas were desperate to see the spread of monkeys over the entire area from the boundary to moat of Lanka. The way the space between was filled with Vanaras seemed as though the Vanaras converted into boundaries. Rakshasas were seen making a loud noise.

पदच्छेदः

कृत्स्नं	कृत्स्न (२.१)
हि	हि (अव्ययः)
कपिभिर्	कपि (३.३)
व्याप्तं	व्याप्त (√वि-आप् + क्त, २.१)
प्राकारपरिखान्तरम्	प्राकार–परिखा–अन्तर (२.१)
ददृशू	ददृशुः (√दृश् लिट् प्र.पु. बहु.)
राक्षसा	राक्षस (१.३)
दीनाः	दीन (१.३)
प्राकारं	प्राकार (२.१)
वानरीकृतम्	वानरीकृत (√वानरी-कृ + क्त, २.१)

छन्दः

अनुष्टुप् [८]

छन्दोविश्लेषणम्

१	२	३	४	५	६	७	८
कृ	त्स्नं	हि	क	पि	भि	र्व्या	प्तं
प्रा	का	र	प	रि	खा	न्त	रम्
द	दृ	शू	रा	क्ष	सा	दी	नाः
प्रा	का	रं	वा	न	री	कृ	तम्