[Proc. Rot. Soc, Victoria, 24 (N.S.), Pt. II., 1911.] Art. XXIII. — The Anatomy of the Slug, Cystopelta petterdi, var. 'purpurea, var. nov. By olive B. DAVIES, B.Sc. (Government Research Bursar, Melbourne University). (With Plates LXIV-LXIX.). [Read 14.th December, 1911.]. Since the description given by Mr. Hedley in 1890 no fur-ther work has been done, so far as I can discover, on Cystopelta petterdi. Professor Spencer and Mr. Hedley therefore suggested that I should give a fuller acount of the anatomy of this animal. In the Biological Department of the Melbourne University were some preserved specimens, some of which came from Beech Forest, Victoria, and were preserved in spirit, and so contracted as to be of no use for external description or dis-section. These were used in sections, being stained with acetic Acid alum carmine. The rest came from Fernshawe, Victoria, and w^ere preserved in formalin. Later I found two living speci-mens at Narbethong, Victoria. These I used for dissection and external description. Professor Tate gave a short description of Cystopelta petterdi in the Report of the Royal Society of Tasmania, 1880. A description and drawing of the animal has also been given by Mr. C. Hedley in the Proceedings of the Linnean Society of New South Wales, 1890. External Features and General Description. (Fig I.) The animal is small and slug-like, with its organs drawn into s, dorsal hump as in snails, but no spiral twisting is visible from the exterior. The hump is very large, extending from just behind the reproductive opening anteriorly, to overhang about half the free portion of the foot posteriorly. In colouring, my specimens resemble neither those described by Mr. Hedley nor 101
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