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Show 1889.] LAND-SHELLS FROM BORNEO. 345 Cyclotus ptychoraphe, v. Martens. Cyclotus ptychoraphe, v. Martens, Monatsber. d. Berlin. Akad. 1864, p. 117; Preuss. Exped. Ost-Asien, Die Landschnecken, p. 125, pi. ii. fig. 11 (1867). Hab. Singkawang, Borneo; rare (v. Martens). 32. CYCLOTUS LINITUS, n. sp. (Plate XXXVI. fig. 3.) Shell globosely turbinate, rather openly umbilicated ; sculpture the first two apical whorls show distinct liration, 14 on the whorl, it thence is suddenly smooth and transversely striated ; spire conic ; apex papillate ; suture deep ; whorls 4, very rounded ; aperture circular, subvertical; peristome simple, not thickened. Size: maj. diam. 7*25 ; alt. axis 3*5 millim. Operculum shelly in front, multispiral. Hab. Busan Hilis (A. Everett). There are a large number of specimens in the collection, all covered with a black substance completely concealing the form of the shell ; a state so often seen in certain species of Alyceeus, and as I have observed in those that have a burrowing habit. In this Cyclotus the shells are more completely coated than usual. The drawing is from one cleaned after a soaking in warm water. 4th Group. Cycloti liratuli. Shell turbinate, with high spire, with spiral ribbing; aperture simple, not reflected. 33. CYCLOTUS TRILIRATUS. Cyclostoma triliratum, Mart. u. Chem. Conch.-Cab. ed. ii. p. 363, pi. xlvii. figs. 8-10. Cyclophorus triliratus, Reeve, Conch. Icon.pl. xix. fig. 96 (1861). Cyclostoma quadrifilosum, Benson, Ann. & Mag. Nat. Hist. ser. 2, x. p. 270 (1852). In Dr. Hungerford's collection. Cyclotus angulatus, v. Martens. Cyclotus anyulatus, v. Martens, Jahrb. d. deutsch. Malakozool. Gesell. 1874, p. 56. JERDONIA, Blanf. 34. J E R D O N I A ? B O R N E E N S I S , n. sp. (Plate X X X V I . figs. 6, 6 a.) Shell dextral, pyramidal, turreted, strongly lirate, openly umbilicated ; sculpture 5 strong longitudinal ribs on the whorl, the two below and the three above separated by a wider interval; two strong closely placed longitudinal ribs run with the angulate margin of the umbil.cus, and one fine rib within it; colour pale greenish horny ; spire high ; apex rather pointed ; suture angulately open ; whorls 6, angularly convex ; aperture oval, oblique, not double ; peristome simple, with a marked sinuation or shallow notch on the lower margin ; columellar margin rounded and slightly thickened. Size: maj. diam. 2*7 ; alt. axis 2*3 millim. |