190 ANAUCHEN. 



stome. Palatal plica feeble, short and immersed. Color, a 

 light corneous tint, the peristome and apertural folds whitish. 

 Alt. 3y 2 , greatest diameter 2.7, least 2.3 mm.; aperture 1% 

 mm. high, 1.6 wide (B. & D.). 



Haut-Tonkin (Messager). Lao-Kay. 



Boysidia gereU BAV. et DAUTZ., Journ. de Conchyl., 1903, 

 p. 212, pi. 9, f. 5-8. 



This species is characterized by the concavely pyramidal 

 form, oblique aperture with three small, simple teeth, and the 

 pale color. 



The embryonic whorl is glossy, weakly granulose, and shows 

 some very delicate spiral lines. Subsequent whorls are min- 

 utely granulose, and the last 2% spirally striate. The last 

 whorl is swollen above the middle. The parietal lamella is 

 simple and straight; apparently the angular has wholly dis- 

 appeared. The columellar lamella and lower palatal plica are 

 often very weak. Some specimens from Lao-Kay are less ele- 

 vated than the type. 



3. ANAUCHEN ROCHEBRUNI (J. Mabille). 



Shell umbilicate, subregularly conic-pyramidal, small, uni- 

 form corneous, pellucid, fragile, slightly striate under a strong 

 lens. Spire pyramidal, high; apex glossy, large, obtuse. 

 Whorls 5~y 2 to 6, convex, the first gradually and regularly in- 

 creasing, the rest very rapidly, separated by a deep suture; 

 the last whorl large, convex, angular at the periphery, upper 

 angle disappearing before reaching the peristome, convex 

 below, obtusely keeled around the narrow, perspective umbil- 

 icus, near the aperture a little dilated and not descending. 

 Aperture slightly oblique, narrowed by two teeth, one parietal, 

 rather deeply placed, the other palatal, tuberculiform. Peri- 

 stome interrupted, acute, a little thickened, spreading, white 

 and glossy on the inner side ; margins approximating, joined 

 by a very thin callous. Major diam. 3, minor 2, alt. 4 mm. 

 (Mabille). 



Tonkin. 



Hypselostoma rochebruni MABILLE ("Moll. Tonk. Diag., p. 

 8; May 14, 1887"); Bull. Soc. Malac. de France, iv, July 

 1887, p. 121. 



