III.—Blind Trilobites

Publisher Website
Google Scholar
Abstract
The occurrence of certain genera and species of trilobites which are destitute of eyes has long been known, and so much importance was attached by Dalman to the presence or absence of the visual organs that he instituted two principal divisions of the trilobites based simply on these characters. Goldfuss followed the same lines in his system of classification, though he took into consideration also the structure of the eyes; and Emmrich likewise regarded the possession or lack of these organs to be of taxonomic value. Although in modern schemes of classification more stress is laid on other features of the organization, yet with our increasing knowledge of the ontogeny of various species of trilobites it is perceived that the presence, position, and nature of the eyes are points which must by no means be overlooked.

This publication has 1 reference indexed in Scilit: