72 collinge: non-operculate land and freshwater molluscs. 



de Morgan (22, 23), Crosse (9, 10), Godwin- Austen and Nevill (14), 

 Stoliczka (30), and Mollendorff (19, 20, 21).* 



My best thanks are here tendered to the Council of the Royal 

 Society for a Grant in aid of this work. 



The identification of some of the specimens here recorded, has 

 often proved very difficult, and I must express my indebtedness and 

 thanks to Messrs. Edgar A. Smith and E. R. Sykes for the generous 

 assistance they have at all times so willingly given me. 



LIMNAEIDAE. 



Limnophysa, Fitzinger. 



Limnophysa singaporiea, Kiistei. 



Limnaeus singaporinm, Kust. : Conch. Cab., T. i, pt. xvii, p. 35, 



no. 50, Tab. 6, fig. 17. 

 Hah. — Biserat, State of Jalor. 



STREPTAXIDAE. 



Ennea, H. & A. Adams. 



Ennea (Mierostrophia) perakensis, Godw.-Aust., and G. Nev. 



Ennea peraken>(is, Godw -Aust., and G. Nev. :P.Z.S., 1879, p. 735, 



pi. lix, fig. 2 (juv.). 

 Ennea (Microdrophia) perakensis, Mlldff. : P.Z S., 1891, p. 331, 



pi. XXX, figs. I, I a. 

 Hah. — Caves near Biserat, State of Jalor. 

 One specimen. 



Streptaxis, Gray. 

 Streptaxis sykesi, n. sp. 



PI. iv, figs. I, 2. 



Shell dextral, subdiscoidal, depressed, flattened above, concave 

 below, deeply and widely umbilicated, smooth except for faint lines of 

 growth ; whorls 5, regularly increasing, aperture somewhat L-shaped, 

 deeply depressed above, armature consisting of one lamelliform 

 projection, ascending inwards, situated on the columella whorl ; 

 peristome thickened and reflected. 



Diam. maj. 11 "5, min. 8"5 ; alt. 3 millim. 



Hah. — Biserat, State of Jalor. 

 This interesting species seems to be very distinct from any prev- 

 iously described. It is perhaps most closely allied to the S. plussensis 



Since this paper was completed, Mr. E. R. Sykes has published two papers in this 

 Journal, and Dr. Mollendorff one in the Nachrichtsblatt d. D. .Malak. Gesell., the 

 titles of which have been added to the Bibliography. 



