GASTROCOPTA, AUSTRALIA. 171 



The specimens sent by Professor Tate, two of which are 

 figured in pi. 30, figs 2, 3, were partly in the same lots with 

 G. larapinta and G. tatei, and were mostly labeled P. mooreana 

 by Professor Tate. This identification I at first accepted, but 

 according to advices from London, the types of mooreana have 

 a horizontally entering columellar lamella, while in this form 

 the lamella ascends inwardly. Shells like pi. 30, fig. 11, hav- 

 ing an interpalatal plica but no basal fold, were also included 

 in mooreana by Tate, who figured one of that form in his pi. 

 19, fig. 20. 



It differs from larapinta by the absence of infraparietal 

 and interpalatal plicae, in the series of 20 seen; the size is a 

 little less ; yet bearing in mind the analogous case of 6?. pen- 

 todon (Say), I feel doubtful about its subspecific distinction 

 from G. larapinta. 



In one specimen of the lot the angular lamella is very small, 

 visible only on close inspection. 



Specimens from Mr. Hedley, collected by Mr. Helms at For- 

 rest River (pi. 30, fig. 1), are a little larger, 2.5 to 2.55 mm, 

 long, diam. 1.1 mm., or 2.4, 1.2 mm. There is no brownish 

 tint except what may be caused by the dried animal. There 

 is a small infraparietal nodule in some examples, wanting in 

 others. The columellar lamella has a rounded outline and 

 ascends obliquely inward. Lower palatal plica is strong, the 

 upper smaller and far shorter. There is no basal fold. The 

 lip expands broadly. This place is not very far from the type 

 locality of Pupa mooreana Smith. 



104. GASTROCOPTA WALLABYEN sis (Smith). 



Shell dextral, cylindroid, pellucid, white, narrowly rimate ; 

 whorls 5, very convex, separated by a deep suture very ob- 

 liquely striate, the last ascending in front. Spire cylindrical, 

 obtuse at the apex. Aperture small, ringent, one-fourth the 

 total length, having seven unequal teeth (three small parietal, 

 the middle one largest, one large lamelliform columellar, and 

 three large lamelliform palatals) ; peristome lightly expanded, 

 the margins approaching, joined by a thin callous. Length 

 2.5, diam. 1 mm. (Smith). 



