. Mollusca ... Mollusks. PLECTOPXLIS. 113 101. Plectopylis brahma, Godwin-Austen. Helix (Plectopylis) brahma, Godwin-Austen, J. A. S. B. xlviii, 1879, p. 3, pi. 1, fig. 3 (shell and armature). Selix {Atopa (Plectopylis)) brahma, Tryon, Man. Conch, ser. 2, iii, 1887, p. ]64, pi. 36, figs. 35-37. Plectopylis brahma, Pilsbry, Man. Conch, ser. 2, ix, 1894, p. 145; Gude, Science Gossip, n. s. iv, 1897, p. 170, fig. 63 (shell and armature). Plectopylis (Chersaecia) brahma, Gude, op. cit. vi, 1899, p. 148. Original description:—"Shell sinistral, rather closely umbili- cated, discoidal, pale ochr
. Mollusca ... Mollusks. PLECTOPXLIS. 113 101. Plectopylis brahma, Godwin-Austen. Helix (Plectopylis) brahma, Godwin-Austen, J. A. S. B. xlviii, 1879, p. 3, pi. 1, fig. 3 (shell and armature). Selix {Atopa (Plectopylis)) brahma, Tryon, Man. Conch, ser. 2, iii, 1887, p. ]64, pi. 36, figs. 35-37. Plectopylis brahma, Pilsbry, Man. Conch, ser. 2, ix, 1894, p. 145; Gude, Science Gossip, n. s. iv, 1897, p. 170, fig. 63 (shell and armature). Plectopylis (Chersaecia) brahma, Gude, op. cit. vi, 1899, p. 148. Original description:—"Shell sinistral, rather closely umbili- cated, discoidal, pale ochry-brown, finely and regularly striate. Apex flat, yet slightly convex. "Whorls 7, last angular above and rounded below, slightly compressed behind the aperture and hardly descending. Aperture lunate, oblique. Peristome slightly reflected and thickened, white, continued as a callus on the body- whorl. " Internal structure complicated ; the parietal vertical lamina is strong and gives ofE a short horizontal lamella at the lower end; above this are two other and parallel/ree lamellae (in three cases out of twelve I examined, the upper lamella was united to the vertical barrier, but this does not affect the order of position and. Pig. 54.—Plectopylis brahma. arrangement of all those processes in this species), both short, the lower being the best developed ; the upper is occasionally united to the upper end of the vertical barrier. There is a very thin thread-like lower free lamella extending to the peristome and uniting with the parietal callus. The palatal plicce are arranged in two rows, those of the anterior row are few and large, four in number, the two upper long, narrow, and adjacent, the 3rd is a flattened dome-like mass, the 4th is long and curving inwards. Behind this at a short distance is the second row, consisting of fourteen very minute, closely arranged, thin, longer or shorter tooth-like processes, those on the upper side being slightly the
Size: 2702px × 925px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorg, bookcentury1900, bookdecade1900, booksubjectmollusks
