166 GASTROCOPTA, AUSTRALIA. 



wardly towards the lower. Both stand on a thin callous. The 

 peristome is thin and well expanded. 



Length 2.8, diaui. above aperture 1.07 mm. ; S 1 /^ whorls. 



Length 2.5, diam. above aperture 1.1 mm. ; 5 whorls. 



Central Australia (Horn Expedition). 



This species is readily distinguishable from other known 

 central Australian species by the form of the columellar 

 lamella, which shows affinity with the Torres Strait species 

 G. mofdonndli. It is a narrower shell than G. pediculus. 



The specimens were picked out of lots sent as Pupa lara- 

 pinta and mooreana- by Professor Tate. It differs from both 

 in the direction of the columellar lamella, among less impor- 

 tant characters. 



By an error of the artist, the columellar lamella was in- 

 correctly shaded in fig. 10, giving a false idea of its shape. 

 In pi. 30, fig. 12 it is drawn correctly. 



Section Australbinula Pilsbry. 



Columellar lamella obliquely ascending and receding above, 

 the inner end of the parietal lamella curving towards the 

 columella ; other teeth as in the other Australian Gastrocopts. 

 Type G. hcdlcyi (G. rossitcri Pils., p. 11, not of Brazier). 



101. GASTROCOPTA HEDLEYI n. sp. PI. 27, figs. 1, 2, 3, 4. 



This is a dextral, cylindric shell, the upper third tapering 

 to the very obtuse summit, composed of 5 rather strongly con- 

 vex whorls; of a grayish or bluish white color, imperfectly 

 transparent. The surface is smooth, scarcely showing stria- 

 tion. The parietal lamella is high and thin, long, bent in cres- 

 cent form, as seen in a basal view (pi. 27, fig. 1) ; the inner 

 half is highest, and the middle is waved down with the edge 

 flaring towards the periphery. The angular lamella is a quite 

 short and thin lamella, highest in the middle, running from 

 the outer lip, and forming a "V" with the forward end of the 

 parietal, which its low inner end does not quite touch. The 

 infraparietal lamella is short, and more deeply immersed than 

 the parietal (pi. 27, fig. 1). The columellar lamella is a broad 

 plate which ascends obliquely backward, and in profile view 



