THE ANNALS AND MAGAZINE OF NATURAL HISTORY. [SECOND SERIES.] No. 75. MARCH 1854. XVI. — Contributions to the Palceontology of Gloucestershire : — A description, with Figures, of some new Species of Echinodermata from the Lias and Oolites. By Thomas Wright, M.D. &c.. Professor of the Natural Sciences in the Cheltenham Grammar School*. [With two Plates.] Cidaris Edwardsii, Wright. PI. XL fig. 1, a-f. Test crushed, the form therefore unknown. Ambulacral areas narrow, with two rows of small perforated tubercles, and smaller perforated ones interspersed amongst them ; interam-bulacral areas about four times the width of the ambulacral, having two rows of large tubercles with confluent areolas ; the primary spines long, with a compound structure; the secondary spines short with blunt apices, the surfaces of both sculptured with delicate longitudinal lines ; mouth armed with powerful jaws, each with three prominent tricarinated ridges. Upper part of the test and ovarial disc unknown. Description. — It is much to be regretted that no other speci-men of this noble Urchin but the one before us has been ob-tained from the Lias of Gloucestershire, and as the specimen exhibits only the lower half of the test, many points of its ana-tomy remain unknown; enough of its structure, however, is shown to enable us to point out some important affinities and differences in this rare species. The narrow ambulacral areas are provided with two rows of small perforated tubercles, amongst which smaller tubercles are irregularly scattered; these tubercles all support short stout spines with a minutely sculptured surface, and which are abun-♦ Read at a Meeting of the Cotteswold Naturalists* Club, held at Chel-tenham, May 4th, 1852. Ann. ^ Mag. N. Hist. Ser.2. Vol. xiil 11
XVI.—Contributions to the Palæontology of Gloucestershire: — A description, with figures, of some new species of Echinodermata from the Lias and Oolites
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