1889.] LAND-SHELLS FllOM BORNEO. 3-45 



Cyclotvs j)tychoraphe, v. Martens. 



Cyclotus ptychoraphe, v. Martens, Monatsber. d. Berlin. Akad. 

 1S64, p. 117; Preu.^s. Exped. 0:-t-Asien, Die Landsehnecken, p. 12.5, 

 pi. ii. fig. 11 (1867). 



Ilab. Singkawang, Borneo ; rare (». Martens). 



^ f^ ' 32. Cyclotus linitus, n. sp. (Plate XXXVI. fig. 3.) 



Shell globosely turbinate, rather openly uinbilicated ; sculpture 

 the first two apical whorls siiow 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. Bu<ian Hills {^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 Ahjcaus, and as I 

 have observed in those that have a burrowing habit. In this Cyclotus 

 the shells are more complelely 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 tri/iratum, Mart. u. Chem. Conch.-Cab. ed. ii. p. 363, 

 pi. xlvii. figs. »-10. 



Cyclophorus triliratvs. 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. Jerdonia ? borneensis, n. sp. (Plate XXXVI. figs. 6, 6 a.) 

 Shell dextral, pyramidal, turreted, strongly lirate, openly umbili- 



cated ; 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 

 umbilicus, 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. diani. 27 ; alt. axis 2*3 millim. 



