SB 10.12.21
pratispardhete srkkabhyam
savyasavye nagodare
tunga-srngalayo ’py etas
tad-damstrabhis ca pasyata
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
On the left and right, the two depressions resembling mountain caves are the corners of its mouth, and the high mountain peaks are its teeth.