Unguligrade

"Dr. [Philip] Sclater submitted a classification of the Ruminating Artio-dactyls to the Section, in which he separated the Antilocapra from the other Unguligrades."

"It has perhaps not been observed hitherto that the terms Digitigrada, Unguligrada, and Plantigrada fully apply to the Arthropoda, or that the manner in which the animals treat the ground and the corresponding structure of their feet deserve special attention as distinctive characters of classes and orders in this series of the animal kingdom; yet it is so. […] All Crustacea (including the Myriapoda, which merely exhibit the Crustacean type modified for terrestrial life) are Unguligrada; and the same is the case with all larvæ of Insects with complete metamorphosis, and with some of the lower groups of Insects, especially Thysanoura and Siphunculata—the unguligrade Arthropoda being at the same time, with few exceptions, also Solipeda."