10 . 
LA.XJ) SHELU':, 
S.A. NAT.. 
VOL. XVIIT. No. 2. 
parietal, only one of which is large, on the base of the shell, and 
the other three or four inside the outer lip. The species are- 
differentiated by size and form, and to some extent variation in 
the teeth, as to shape and position. They are difficult to separate 
without microscopic examination. • 
Key to Species. 
Shell minute, dextral, large parietal tooth recurved 
larapinta 
Shell larger, dextral, large parietal tooth not recurved though 
twisted 
margaretae 
Shell similar but smaller than the preceding, but teeth a little 
smaller tatei 
Australbinula larapinta. 
1896. Pupa larapinta Tate, Rep. Horn. Sci. Exped. Centr. Austr., 
Zool. pt. II, p.20S, pi. XIX, f.l9, February, Central 
Australia=Palm Creek, fide topotypes in A. M. ex 
Horn. 
1917. Gastrocopta larapinta Pilsbry, Man. Conch. ( Tryon) ^ 
Ser. 2, (pt. 94), Vol. XXIV, p. 168, pi. 30, figs. 5-7, 9-1 L 
1917. Gastrocopta larapinta deserti Pilsbry, Man. Conch. 
(Tryon), Ser. 2, (pt. 94), Vol. XXIV, p.l70, pi. 30, ff.1-3, 
July 18. Central Australia~Tempe Downs, etc. 
Pilsbry examined two lots sent by Tate, and noted that they 
were very mixed apparently from various localities, and differ- 
entiated five variations, one of which he named as a new sub- 
species as above. It can not be reinstated until series from exact 
localities are carefully criticised. This deserti is smaller with 
weaker lamellae, small parietal tubercle missing, and the medium 
palatal has also disappeared. The shells appear adult but similar 
formation of teeth is seen in juvenile larapinta. 
Australbinula tatei. 
1917. Gastrocopta tatei Pilsbry, Man. Conch. (Tryon), Ser. 2, 
Vol. XXIV (pt. 94), p.l6S, pi. 26, ff.9-10: pi. 30, fig. 12^' 
July 18. Central Australia. 
This species was described from specimens sent to Pilsbry by 
late under the names of Pupa larapinta and mooreana. The 
latter had been described by Smith from Roebuck Bay, Xorth- 
W est Austiaha, and obviously would not be likely to occur In 
Central Australia. Tate, under the name Pupa mooreana, (Rep. 
Horn Sci. Exped. Centr. Austr., pt. II, Zook, p.206, pi. XIX, fig. 
