216 GYLIAUCHEN. 



little reflected. Diam. maj. 4%, min. 3, aperture 2 mm. long 

 and wide (Morlet). 



Tonkin: montagne de 1 'Elephant (Jourdy). 



Hypselostoma crossei MORLET, Diagn. de Mollusques terr. 

 et fluv. du Tonkin, 1885, p. 2; Journ. de Conchyl., vol. 34, 

 1886, pp. 259, 275, pi. 12, f . 5-5c. Hypselostoma crossei subsp. 

 endodonta and 'brevituba MLLDFF., Nachrbl. D. Malak. Ges., 

 1901, p. 76. 



This species is distinguished by its dark color, thickened 

 peristome and numerous accessory teeth. 



Two of Morlet 's figures are copied, pi. 36, figs. 9, 10. 

 Specimens from near Haiphong, received from M. Dautzen- 

 berg, are drawn in pi. 36, figs. 11-13. The color is dark vina- 

 ceous-brown or almost chocolate, uniform or with some whitish 

 lines, the spire paler, more tawny; the aperture being vina- 

 ceous-russet. There are 4% whorls, at first strongly convex, 

 the penult less so. The last whorl is convex below the suture, 

 in its last half either strongly or weakly excavated above the 

 strong peripheral angle ; also within the rounded angle which 

 bounds the umbilicus. The neck ascends a little and is nearly 

 circular in section, but the supraperipheral furrow persists, 

 also one above the parietal wall. The length of the free neck 

 varies; it is often very short. The aperture looks upward a 

 little, and when most fully toothed has: a small, narrow but 

 long angular lamella, which bears a whitish lump near its 

 outer end; a strong high and straight parietal lamella; two 

 low, obtuse, rather long infraparietal lamellae ; a horizontally 

 entering, downward-bent columellar lamella (all of these 

 shown in fig. 11) ; a small supracolumellar above the columel- 

 lar, and one or two below it. The basal region is occupied by 

 two or three minute plicae; upper and lower palatal plicae 

 well developed, the lower larger, as usual ; between them, and 

 above the upper, there are several inter- and suprapalatal 

 plicae, the latter often continuing as far as the angular. The 

 angular, parietal and columellar lamellag, upper and lower 

 palatal plicae are constant, but the number of small accessory 

 teeth varies with every specimen. All of them are set with 

 many short points or prickles. The peristome is widely re- 



