III.—Blind Trilobites

Abstract
We now come to the second o rder of the Trilobita, which Beecher (loc. cit.) calls the Opisthoparia. In common with the third order, the Proparia, compound paired eyes are usually present, and these are invariably situated on the free cheeks, which form part of the dorsal surface of the head-shield.

This publication has 2 references indexed in Scilit: