BOYSIDIA. 197 



length, where it shows traces of its dual composition. The 

 columellar lamella is strong, slopes obliquely downward as it 

 enters, and the outer end reaches to, but not upon, the expan- 

 sion of the lip. There are two short palatal plicse, the upper 

 one almost touching the parietal lamella, the lower one slightly 

 more deeply placed. Basal fold extremely minute. 



Alt. 2.75, diam. 2 mm. ; longest axis of aperture 1.3 mm. 



China: Hangchow, province Che-kiang (Hirase). Type no. 

 94,743 A. N. S. P. 



Hypselostoma (Boysidia) hang chow ensis PILS., Proc. A. N. 

 S. Phila., 1908, p. 42, fig. 6. 



The shell is much smaller than B. hunana conspicua Mlldff., 

 with the angular and parietal lamellse more closely united, the 

 upper palatal approaching nearer to it, and the basal so 

 minute that it is very difficult to see, and probably will prove 

 to be inconstant. 



4. BOYSIDIA STROPHOSTOMA (Mollendorff). PL 33, figs. 15, 16. 



Shell rather openly umbilicate, turrited conic, very min- 

 utely striatulate, corneous-brown. Whorls 6, very convex, the 

 last produced forward, somewhat ascending. Aperture ver- 

 tical, rounded-tetragonal, the peristome thin, expanded. 3 to 

 4 palatal plicae, of which the middle one is longer ; columellar 

 strong, spirally receding; parietals 2, the first short, moder- 

 ately elevated, flexuous, the other deeply placed and approx- 

 imate to it. Length 2%, diam. 2% mm. (Mlldff.). 



China: on the marble rocks of Tsat-sing-yen, on the West- 

 ern Kiver, prov. Guang-dung, taken by a Chinese collector. 



Pupa (Boysidia) strophostoma MLLDFF., Jahrb. D. M. Ges., 

 xii, 1885, p. 395, pi. 11, f. 23. 



The oblique striation resembles that of B. hunana con- 

 spicua; there is a very fine, indistinct granulation over it. 

 The angular lamella is short, parallel to the parietal lamella, 

 with which its inner end weakly connects by a quite low cal- 

 lous. The parietal lamella is higher and straight. The colu- 

 mellar lamella descends obliquely inward. Upper and lower 

 palatal plicse are strong, subequal. There is a weak basal and 

 a well-developed suprapalatal plica. Alt. 3, diam. 2.1 mm. 



