. Mollusca ... Mollusks. 142 HELIOIBiE. In colour the shell is chestnut-brown above, while the umbilical region is white, in which it resembles the variety infrafasciata. The present variety is based on a shell in my collection, but the Museum of Mason's College, Birmingham, possesses three specimens identical with it. "Var. infrafasciata, Gude. Helix achatina, PfeifFer, , Heliceen, i, 1848, p. 382, pi. 66, figs. 28-30; Hanley & Theobald, Conch. Ind. 1870, pi. 57, figs. 8, 9. Plectopylis achatina, var. infrafasciata, Gude, Science Gossip, n. s. V, 1898, p. 133, fig. 84. Dif
. Mollusca ... Mollusks. 142 HELIOIBiE. In colour the shell is chestnut-brown above, while the umbilical region is white, in which it resembles the variety infrafasciata. The present variety is based on a shell in my collection, but the Museum of Mason's College, Birmingham, possesses three specimens identical with it. "Var. infrafasciata, Gude. Helix achatina, PfeifFer, , Heliceen, i, 1848, p. 382, pi. 66, figs. 28-30; Hanley & Theobald, Conch. Ind. 1870, pi. 57, figs. 8, 9. Plectopylis achatina, var. infrafasciata, Gude, Science Gossip, n. s. V, 1898, p. 133, fig. 84. Differs from the type in being more rounded in contour, and in the last whorl not widening at the aperture; the umbilicus is more shallow and the peristome more flattened and reflexed ; the right margin is a little depressed; the shell is blackish or purplish brown above, with a white or bluish white band below, reaching from the umbilical angulation to the lower suture ; the peristome is purplish brown, the left margin being paler. Major diam. 22, minor 18 mm.; alt. 8 mm. Hah. Burma : Moulmain ; Mergui (Philippi). Plectopylis hensoni, var. infrafasciata, is still darker than the. c Fig. 73.—Plectopylis bensoni, var. infrafasciata. variety ohesa, being of a blackish or purplish brown. Like that variety it is rounded in contour, but it is larger and more flattened ; while the umbilicus is a little more shallow and the peristome more flattened and reflexed than in the type. The peristome is livid purplish in colour, the left margin being paler and the right margin a little inflected. A whitish or bluish-white band below reaches from the umbilical angulation to the lower suture. The armature is similar to that of the type, but the horizontal parietal fold near the lower suture is visible from the aperture and ter- minates close to the ridge. The specimen figured was received by me from the late Eobert Cairns. Four specimens in the collection of the late E. L. Layard and one specime
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Keywords: ., bookauthorg, bookcentury1900, bookdecade1900, booksubjectmollusks
