196 



BOYSIDIA. 



larnelliform, somewhat twisted teeth, one above, the other 

 columellar. Apex of the aperture a little directed towards 

 the right. Growth striae little impressed. Umbilicus patulous, 

 deep. Length 4, width 2.5 mm. (Ancey). 



China: Lake Poyang (M. Kermorgant). 



Pupa dorsata ANCEY, Le Naturaliste, i, 1881, p. 373, 407 ; 

 II Naturalista Siciliano, ii, 1883, p. 266. --Boysidia dor sails 

 Ancey, MLLDFF., Ann. Mus. Zool. Acad. Imp. Sci. St.-Petersb., 

 vi, 1902, p. 85. 



Upon comparing with a specimen of hunana, from Gredler, 

 M. Ancey considered dorsata to be "a variety of Pupa hunana. 

 of lighter color, thinner, smaller, with the spire more rounded 

 and less strongly conoidal, the umbilicus narrower, the last 

 whorl less swollen, and the lower tooth of the interior of the 

 right margin very obsolete. Perhaps the species collected by 

 M. von Molleudorff southwest of Canton, and which M. Gred- 

 ler (Malak. BL, 1882, 178) declared related to hunana but 

 different, is to be referred to the form I described." 



3. BOYSIDIA HANGCHOWENSIS (Pilsbry et Hirase). PI. 33, 

 fig. 17. 

 The shell is high-conic, with obtuse apex and convex base, 



minutely perforate, with a long curved umbilical rirnation, 



dark brown. The spire is straightly 

 conic, composed of 5y 2 convex whorls. 

 The last whorl ascends slowly to the 

 aperture, its latter part being straight- 

 ened and built forward to the level 

 of the ventral face of the shell. There 

 is no crest or marked constriction be- 

 hind the lip. The aperture is trun- 

 cate-oval, the upper margin straight. 

 Peristome thin, well expanded, con- 

 tinuous; with a shallow dent outside 

 at the upper third of the outer lip. 

 The angular and parietal larnellaa are 

 coucrescent into one stout, straight 



lamella reaching to the margin, wider in the middle of its 



I 



Fig. 17. B. liangclwwensis. 



