Pertaining to the Lissencephala, the second group of mammals in Owen's classification, which have smooth brains.

In J. D. Dana's classification: a member of the Megasthena, a division of Mammalia comprising the relatively large and powerful viviparous mammals…

In J. D. Dana's classification: of or relating to a group of animals characterized as of greater size or physical power than those of a parallel…

Pertaining to or having the characters of the Gyrencephala, one of the four main divisions of mammalia in Owen's system, consisting of those in…