On some species of Acidaspis from the Lower Silurian Beds of the South of Scotland

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Abstract
Having occupied part of my leisure for the last year or two in examining the fossils of the Silurian beds of the south of Ayrshire, described by Sir Roderick Murchison in 1851, I have met with many species and not a few generic types additional to those included in Mr. Salter's list accompanying Sir R. Murchison's paper on the Silurian Rocks of the South of Scotland. As most of the known British species of the genus Acidaspis have either been already described or are now in process of description, I take an opportunity of adding the few new forms which have hitherto occurred during the course of my investigations. The specimens are few, and in many cases fragmentary. The first two species are an addition to a little group already represented among our Lower Silurians by Acidaspis Jamesii and A. bispinosa . The group is formed of minute species, usually rather meagrely ornamented, and having a tendency to the fusion of the various prominent parts of the head; a tendency which reaches its maximum in the subgenus Trapelocera , between which subgenus and Acidaspis proper (represented by A. mira , Barrande, and A. Brightii ) Murch.) this group may be considered a link.

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