"Cerion (Strophiops) plegmatum new species. Pl. LVIII, fig. 5.
Shell of moderate size, light and thin, subcylindric, with two and a half polished, pale, latterly microscopically reticulate whorls, followed by seven smooth or feebly striated whorls axially striped or clouded with dark or light brown and opaque white. Umbilicus closed, base attenuated, apex rather pointed; peristome thin, simple, yellowish white, broadly reflected, in the adult continuous over the body; parietal laminae short, compressed, axial lamina low, inconspicuous; the base of the last whorl sometimes strongly axially striated.
Height of
shell Aperture. Max. Diameter.
18.5 6.0 8.0 mm.
22.0 7.0 9.0 "
26.0 8.0 8.0 "
Numerous specimens were collected by Dr. J. J. Brown of
This species is much like brunneum, from which it differs by its smaller, more delicate, and thinner shell, narrower and much shorter parietal lamina, its thinner and less reflected peristome, and its last whorl rising much less at its termination. From C. inflatum of