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External morphology provided in Branson (1972). Anatomy figured in Ovaska et al. (2002). Relatively large slug with visceral puch elevated into a pronounced hump and a part of the internal shell plate visible through a slit in the mantle. Tail laterally compressed, keeled, and tipped with a horn0like protuberance, termed the caudal horn. The predominant color of the mantle and foot is typic...