204 
HORN EXPEDITION—MOLLUSCA. 
Family PupiDiE. 
Pupa ischna, Tate. (Plate XIX., Fig. 16.) 
Reference—Trans. Roy. Soc. S. Aust., vol. xviii., p. 191, 1894. 
Shell pyramidally oval, thin, translucent, shining, yellowish-brown, apex 
obtuse; whorls five-and-a-half, moderately convex, separated by an impressed suture, 
hnely obliquely striated. Aperture sinistral, oval, truncated behind ; peristome 
white, broadly reflected, especially over the columella, which does not conceal a 
narrow umbilical Assure; the lips are callously united and there is a prominent 
tubercle at the insertion of the outer lip. 
Dimensions. —Length 4-25, width 1-25. 
Localities. —Alice Springs and Palm Creek. 
A more slender shell and more attenuate apically than P. contraria ; in its 
sinistral spire and apertural characters it agrees with P. myoporime, Tate, which is 
possibly only a sinistral form of P. pacifica^ from which it differs in its narrow 
elongate shape and flatter whorls. It may prove on comparison of actual speci¬ 
mens conspecitic with Chondrula lepidula.. Ad. and Ang. 
Pupa contpapia, E. A. Smith. (Plate XVIII., Fig. 15. Plate XIX., Fig. 17.) 
Reference—Proc. Malac. Soc., June, 1894, p. 96. 
Synonyms— Pupa eremicola and P. beltiana, Tate, Trans. Roy. Soc. S. Aust., 
1894, p. 191. 
Pupa eremicola was founded on a large form of P. contraria., and P. beltiana is 
the dextral state of that species ; these opinions are confirmed by the author of 
P. contraria. P. contraria is, however, not a sinistral foi’in of P. adelaidce, Ad. 
and Ang., as it differs conspicuously by its pyramidal outline. 
Localities. —This is the most widely distributed of the pupie-form shells met 
with by the Expedition; it has the same range within the Larapintine area as 
Stenogyra interioris, and like it extends to Hart Range, whilst in a southerly 
direction it reaches beyond the Larapintine area to the Cretaceous hills about 
Sullivan Creek. The original locality of the species is Houtman’s Abrolhos, on 
the north-west coast of Australia. 
