204 BOYSIDIA. 



French Indo-China: Pac-Kha; Long-Ping (Messager). 



Boysidia paviei BAVAY ET DAUTZENBERG, Journ. de Con- 

 chyl., 1912, p. 20, pi. 3, f. 4-6. 



Distinguished by its small size and very long teeth. The 

 angular and parietal lamellae run parallel, the former being 

 longest (fig. 8). There is no infraparietal. The columellar 

 lamella is strong and enters horizontally. An entering basal 

 plica is subcolumellar in position. Upper and lower palatal 

 plicae are very long, subparallel, and enter deeply, the lower 

 being stouter. A long slender suprapalatal is seen deeply 

 placed in the sinulus, which is defined by a strong, conic tooth 

 within the otherwise rather thin lip. The large apical whorl 

 shows delicate spirals. Later whorls are most minutely 

 granulose, the granules indistinctly arranged in spiral lines. 

 Two specimens from Pac-Kha, the type locality, measure : 



Alt. 1.8, diam. 1.4 mm. 



Alt. 1.85, diam. 1.5 mm. 



9. BOYSIDIA LANDURENSIS (Pilsbry). PL 35, fig. 9. 



Shell rimate, the rimation like a reversed comma, conical, 

 brownish corneous, nearly lusterless and smooth except for 

 some extremely faint growth-striae ; the apex obtuse, whorls 5, 

 convex, the latter part of the last whorl straightened, slowly 

 ascending. Aperture broadly heart-shaped, vertical, ob- 

 structed by three lamellae upon the parietal wall, two on the 

 columella, and four acute folds or plicae within the outer and 

 basal margins. Angular lamella not quite marginal, simple, 

 continuous and deeply entering; parietal lamella higher and 

 thicker, not emerging quite so far, and also very deeply en- 

 tering, its inner end deflected towards the columella; infra- 

 parietal lamella quite small and short, more immersed. Colu- 

 mellar lamella deeply immersed, horizontally entering, smaller 

 than the parietal. Subcolumellar lamella minute, tubercular, 

 deep within. Plicae all remote from the margin, the lower 

 palatal largest, the basal, upper palatal and suprapalatal 

 somewhat smaller, all lamellar. Peristome very narrowly ex- 

 panded, continuous, having a perceptibly thickened rim within 

 the basal and outer margins which terminates in a white 



