procumbent

"Somewhat unexpectedly, both pairs of premaxillary teeth project anteriorly and laterally at the base, implying a procumbent nature atypical of tylosaurines," the study reads.

Stems procumbent from a deep biennial root; leaves round-heart-shaped, on very long petioles, crenate, obscurely-lobed; petals twice the length of the calyx, whitish; carpels pubescent, even.—Waysides and cultivated grounds; common.

Incisors not rooted but continuously growing; those of the upper jaw curved and directed downwards; those of the lower straight and procumbent.

Skull: Larger in every measurement taken; premaxillae extended farther posteriorly to nasals; extension of supraoccipital posterior to lambdoidal suture markedly less; tympanic bullae actually as well as relatively smaller; upper incisors longer and more procumbent.

Leaves.—Mostly alternate on the flowering stems, but smaller and broader ones often opposite or whorled on the procumbent shoots; linear; smooth.