Verse 30

तमसौ श्वपचो नागं कौतुकोद्धुरया दृशा ।चिरमालोकयामास स्पन्दयुक्ताचलोपमम्

In plain words

and that śvapaca gazed long upon the elephant with an eye swollen with wonder -- at that mountain-like creature, alive with motion.