ABSTRACT
Penang, or Prince of Wales Island, although possessing a rich vegetation, growing on old metamorphic soil, a moderately hilly-ground, and a moist warm climate has yielded a comparatively very small number of land shells, and this in spite of the repeated visits which it had received from numerous travellers to the East. This chapter provides information on the ten species of Cyclosto-macea shells. The Penang variety of Cyclophorus Borneensis is flatter, somewhat sharper keeled at the periphery, and with a slightly more expanded lip. The animal of the Penang variety of Borneensis is uniform pale brown with a slight pinkish tinge, and covered with flat greyish warts. The chapter also reports twenty-three species of Helicacea shells. Helix castra shell is subject to a very considerable amount of variation as regards the elevation of the spire. Young specimens are sometimes almost planorbular, and in some adults the total height of the shell is scarcely more than one-third of the larger diameter.
