GASTROCOPTA, AUSTRALIA. 167 



(pi. 27, fig. 4) it is nearly straight. The extremely small basal 

 fold is tubercular. The upper palatal plica is short and ob- 

 lique, descending inward. Lower palatal plica is a large, 

 weakly sigmoid lamina, at first entering, then curving up- 

 wards, then entering again. There is no noticeable palatal 

 callous. The peristome is thin and well expanded. 



Length 2.5, diam. above aperture 1.1 mm. 



New South Wales: Narrabri (C. T. Musson). Type 63279 

 A. N. S. P., paratype in Australian Museum. 



G. rossiteri PILSBRY, this volume, p. 11. Not Pupa rossiteri 

 Brazier, which is also a Gastrocopta. 



The long, peculiarly-shaped parietal lamella and the very 

 large columellar lamella readily distinguish this species. I 

 have given it a name honored in Australian malacology. 



102. GASTROCOPTA MUSSONI n. sp. PL 27, figs. 5, 6. 



The shell is subcylindric, grayish-buff, slightly shining and 

 faintly stria te, of 4% strongly convex whorls. Aperture with 

 7 teeth. The angular lamella is rather short and straight, 

 joining the parietal, but with a notch between. The parietal 

 lamella is high and long, its inner end curving towards the 

 columella. Infraparietal lamella small, entering. The colu- 

 mellar lamella is large and ascends obliquely inward. Its 

 lower and outer end is abrupt. The lower palatal plica is long, 

 curved a little upward within. Upper palatal smaller, short. 

 The basal fold is quite small. Lip is thin and well expanded. 



Length 2.4, diam. above aperture 1.2 mm. (type; fig. 5). 



Length 2.2, diam. above aperture 1.15 mm. (paratype, Aus- 

 tralian Mus. ) . 



Queensland: Calliungal (C. T. Musson). 



This species is intermediate between G. hedleyi and G. lara- 

 pinta deserti, but nearer to the latter. The columellar and 

 parietal lamellae are larger than in larapmta; the parietal 

 enters more deeply and is more curved. The details of tooth 

 structure sufficiently separate mussoni from hedleyi. 



The basal fold is sometimes absent in individuals appar- 

 ently adult. 



The examination of larger series from various Queensland 



