Fossils in the Oxford University Museum, IV: Notes on some undescribed Trilobites

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Abstract
In the course of arrangement of the Trilobites in the Oxford University Museum, a few forms came under notice which might be considered worthy of description. They are two species of Dalmania from the Wenlock Shales, and one of Olenus from the Shineton Shales. Phacops (Dalmania) coronatus, sp. nov. (Pl. XXXV, figs. 1-4.) This species does not attain any considerable size, its total length being from ⅜ to ⅝ inch, while the ratio of its greatest breadth to length exclusive of the caudal spine is as 3 : 5. The head-shield is semicircular and moderately convex, the genal angles being produced posteriorly into two long spines extending to the sixth thoracic segment. The external border is a flattened margin, narrowing in front of the glabella, and produced on its external edge into a series of spines, seemingly sixteen ill number, symmetrically arranged. They are more or loss equidistant one from the other and are of the same length, excepting those two that are immediately in front of the eyes, which seem to be about twice the length of the others. The glabella is coarsely tubercular with smaller granules interspersed, and it widens anteriorly to more than one-third of the width of the head-shield. The forehead-lobe is more or less rhomboidal in outline, its width however being greater than its length, the latter being equal to half that of the total glabella. The inferior lobes diminish ill size posteriorly, being separated by deep

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