. Mollusca ... Mollusks. 96 HELIOID^B. obliquely, their posterior extremities dilated, almost bifurcated ; the fifth also descending a little, its posterior termination suddenly deflected; the sixth, horizontal, with a minute denticle above, and an elongated one a little farther back, below the posterior termination of the fold fsee fig. 41 g, which shows the inside of the outer wall of the shell). The figures are from the type specimens in the collection of Godwin-Austen, who obligingly lent them to me for this purpose. Figs. 41 a-e are of natural size, while figs. 41 d-g are enlarge
. Mollusca ... Mollusks. 96 HELIOID^B. obliquely, their posterior extremities dilated, almost bifurcated ; the fifth also descending a little, its posterior termination suddenly deflected; the sixth, horizontal, with a minute denticle above, and an elongated one a little farther back, below the posterior termination of the fold fsee fig. 41 g, which shows the inside of the outer wall of the shell). The figures are from the type specimens in the collection of Godwin-Austen, who obligingly lent them to me for this purpose. Figs. 41 a-e are of natural size, while figs. 41 d-g are enlarged ; « shows the armatures from the anterior and / from the posterior side, while g exhibits the inside of the outer shell-wall with the palatal barriers in situ. 91. Plectopylis nagaensis, Godwin-Austen. Helix (Plectopylis) nagaensis, Godwin-Austen, P. Z. S. 1874, p. C09, pi. 73, fig. 4 (armature). Selix (Atopa {Plectopylis)) nagaensis, Tryon, Man. Conch, ser. 2, iii, 1887, p. 161, pi. 35, figs. 78, 79. Plectopylis nagaensis, Pilsbry, Man. Ooncli. ser. 2, ix, 1894, p. 146 : Gude, Science Gossip, n. s. iii, 1897, p. 206, fig. 33 (shell and armature). Plectopylis (Chersaecia) nagaensis, Gude, op. cit. vi, 1899, p. 148. Original description.—'' Shell sinistral, widely umbilicated, discoid, dull ochry-brown, epidermis thick and coarsely striate; above depressedly pyramidal. Whorls 7, flat, narrow, and those near apex closely wound, the last very descending near mouth. Aperture diagonal, broadly lunular, outer margin well rounded,. Fig. 42.—Plectopylis nagaensis. peristome very thick, white, reflected. A thick ridge on the parietal side, separated by slight indentations, connects the inner margins ; and from the middle of this runs back a long horizontal lamella, terminating close to, but not connected with, the single vertical lamina ; this is thick and bifurcate below, tapering above and curving backwards ; a short free lamella is. Please note that these images are extracted
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Keywords: ., bookauthorg, bookcentury1900, bookdecade1900, booksubjectmollusks
