. Mollusca ... Mollusks. 128 Ci'CLOPHOBID^. Shell widely uinbilicated, subdiscoid, last whorl solute, descend- ing laterally; peristome free, notched above, with a more or less imperfect reflexed tube at the end of the notch. Operculum shortly cylindrical, multispiral, deeply excavated within, nucleus flat, smooth. 179. Rhiostoma haughtoni, Benson. Rhiostoma haughtoni, Benson, A. M. N, PI. ser. 3, v, 1860, p. 96 ; Pfeiffer, Mon. Pnenm. Suppl. 2, 1865, p. 39 ; Stoliozka, J. A. xl, 1871, p. 150; Thoobald, Cat. Shells Brit. India, 1876, p. 37; Kobelt & Mollendoi-ff, Nachr. Deuts. Malak.
. Mollusca ... Mollusks. 128 Ci'CLOPHOBID^. Shell widely uinbilicated, subdiscoid, last whorl solute, descend- ing laterally; peristome free, notched above, with a more or less imperfect reflexed tube at the end of the notch. Operculum shortly cylindrical, multispiral, deeply excavated within, nucleus flat, smooth. 179. Rhiostoma haughtoni, Benson. Rhiostoma haughtoni, Benson, A. M. N, PI. ser. 3, v, 1860, p. 96 ; Pfeiffer, Mon. Pnenm. Suppl. 2, 1865, p. 39 ; Stoliozka, J. A. xl, 1871, p. 150; Thoobald, Cat. Shells Brit. India, 1876, p. 37; Kobelt & Mollendoi-ff, Nachr. Deuts. Malak. Ges. xxix, 1897, p. 115 ; id., Cat. Pueum. 1899, p. 27 ; Kobelt, Das Tierreich, Lief. 16, 1902, p. 177, fig. 38; id., , Cyolophoridae, ii, 1910, p. 759, pi. 110, fig. 14, pi, 111, figs. 14- 16. Pterocyclos haughtoni, Reeve, Conch. Icon, xiv, 1863, pi. 5, fig. 30. Pterocyclos (ItMostoma') haughtoni, Htmlej & Theobald, Conch. Ind. 1870, pi. 5, fig. 10. Pterocyclus {Rhiostoma) haughtoni, Nevill, Hand List, i, 1878, p. 262. Original description :—" Testa late umbilicata, convexo-depressa, solidiuscula, oblique scabre strintula, superne castanea, subtus albida, fascia angusta mediana saturatiore, utrinque angulato- marmorata, ornata; spira depresso-conoidea, apice proniinulo obtusiusculo, sutura impressa; anfractibus 5, convexiusculis, ultimo cylindrico, autice longe soluto, lateraliter descendente, supenie carina obtusa a sutura usque ad tubulum marginalem decurrente munito; apertura libera, obliqua, diagonali, cireulari; peristoraate subduplici, extus incrassato, reflexiusculo, supeine ad sinistram inciso, tubulo imperfecto, antice aperto, sinistrorse erecto, rimam coronante, munito ; umbilico perspectivo, profundo • operculo testaceo, multispirato, breviter cylindrico, apice planato, Isevigato, anfractibus arete convolutis, luarginibus acute carinatis, spatiis intersitis epidermide scabra vestitis; intus profunde excavato, polite. " Diam. major 21, mi
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