ANAUCHEN. 189 



1. ANAUCHEN MESSAGERI (Bavay et Dautzenberg) . PL 33, 

 figs. 4, 7. 



The shell is thin, opaque, deeply umbilicated. Spire pyra- 

 midal, turrited, obtuse at the summit, composed of 5 convex 

 whorls, separated by a very deep suture, and ornamented with 

 many microscopic, decurrent and noticeably waved striae. 

 Last whorl feebly ascending at the end. Aperture oblique, 

 rounded, armed with 5 folds. Peristome continuous, broadly 

 expanding. Parietal lamella very strong, compressed later- 

 ally, a little sinuous and less emerging than the others. Colu- 

 mellar lamella strong. Three palatal plicae, the middle one 

 stronger than the others. Color corneous fawn ; peristome 

 whitish. Alt. 2%, diam. 2 mm. 



Haut-Tonkin (Messager) ; Bac-Kan. 



Boysidia messageri BAV. & DAUTZ., Joum. de Conchyl., 

 1903, p. 211, pi. 9, f. 1-4. 



"By its general form and the microscopic sculpture this 

 species resembles Boysidia gereti, but it differs by the more 

 rounded aperture, and by the folds within it; they are 

 stronger, project more, and there are three instead of a single 

 one within the outer lip." 



Fig. 4 represents a specimen from Bac-Kan measuring, alt. 

 3, diam. 2.5 mm. The parietal lamella is somewhat arcuate, 

 being bent towards the columella within, but there is no trace 

 of an angular lamella. The plicae and lamellae are rather long. 



2. ANAUCHEN GERETI (Bavay et Dautzenberg). PI. 33, figs. 

 1, 2, 3. 



The shell is thin, subpellucid, deeply umbilicate. Spire 

 pyramidal, turrited, obtuse at the summit, composed of 5 to 

 6 convex whorls, separated by a very deep suture, and orna- 

 mented with many waved microscopic spiral striae. Last 

 whorl not ascending. Aperture obliquely rounded, a little 

 transverse, having three folds. Peristome continuous, 

 broadly dilated and spreading, not reflected at the edge. 

 Columellar lamella immersed, of moderate size. Parietal 

 lamella compressed laterally, stronger and projecting more 

 than the columellar, but not reaching to the edge of the peri- 



