. Mollusca ... Mollusks. 26 BXDODOXTIUJE. l\. Two transverse parietal plates. a. Shell flattened, no fold below umbilical angula- tion, umbilicus still narrower. Habitat, Ceylon, califfinosa. h. Shell conoid, with a double fringe of curved hairs ; a horizontal fold below umbilical angu- lation ; umbilicus .still narrower. Narrowest of all. Habitat, Ceylon 44. Ruthvenia retifera, Pftiffer. Helix retifera, Pfeiffer, P. Z. S. 1845, p. 73 ; Eeeve, Coucli. Icon, vii, 1853, pi. 173, fig. 1170 ; Hanlev & Theobald, Conch. Ind. 1874, pi. 87, figs. 8 & 9. Helix (Plectopylis ?) retife
. Mollusca ... Mollusks. 26 BXDODOXTIUJE. l\. Two transverse parietal plates. a. Shell flattened, no fold below umbilical angula- tion, umbilicus still narrower. Habitat, Ceylon, califfinosa. h. Shell conoid, with a double fringe of curved hairs ; a horizontal fold below umbilical angu- lation ; umbilicus .still narrower. Narrowest of all. Habitat, Ceylon 44. Ruthvenia retifera, Pftiffer. Helix retifera, Pfeiffer, P. Z. S. 1845, p. 73 ; Eeeve, Coucli. Icon, vii, 1853, pi. 173, fig. 1170 ; Hanlev & Theobald, Conch. Ind. 1874, pi. 87, figs. 8 & 9. Helix (Plectopylis ?) retifera, Nevill, Hand List, i, 1878, p. 70. Helix (Plectopylis) retifera, Tryon, Man. Conch, ser. 2, iii, 1887, p. 161, pi. 34, figs. 63, 64. Plectopylis retifera, Pilsbrv, Man. Conch, ser. '2, ix, 1894, p. 146: Gude, Science Gossip, x. s. iii, 1897, p. 301, fig. 43 (^shell and armature). Plectopi/lis iSykesia) retifera, Gude, Science Gossip, N. s. vi, 1899. p. 149. Original description:—" T. umbilieata, obtuse trochiformis, striato-plicatula, lineis nonnullis concentricis elevatis reticulata, carinata, diaphana, sericina, pallida cornea; spira elevata, obtusa; anfr. 6| planiusculi, ultimus basi subplanus, striatus ; umbilicus mediocris, pervius ; apertura depressa, securiformis; perist. simplex, acutum, margine supero brevi, basali plane arcuate. " Diam. maj. 7, min. 6|, alt. 4 ; {Pfeiffer.) Hob. India: Nilgiris {Metcalf, Jerdon) ; Koonoor Grhat (Blan- ford,Nevill); Tinnevelly Hills(5«fMo»i?); ShevroyHills(BZ(i?i/bj-(/); Mysore {Parry).. Fig. 5.—Eutlivenia relifera. The parietal armature consists of a single, strong, vertical plate, slightly sinuate, but not notched, giving off a slight support anteriorly a little below the upper extremity (see fig. 5 e. which shows both the parietal and palatal armatures from the posterior side). The palatal armature—as in all the members of the group — is distinctly visible through the shell-wall, and consists of two
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