100 NILS HJ. ODHNER, MOLLUSCA. 
— at least none are described in the former. On the other hand no recent forms show 
so close agreement with it as rather this genus. The type was found at Hum- 
boldt Bay, Dutch New Guinea. That the present species is really identical with 
Bavay’s species is beyond al] doubt. [I am indebted to Professor A. WicHMANN 
of Utrecht for a comparison of one of the present specimens with the types of 
Bavay. At his kind request it was compared by Dr. C. A. vAN DER WILLIGEN 
in Leiden, who gave this opinion as to its identity: »Beim Vergleich des Exemplares 
des Herrn Dr. OpuHNER mit der Polygyra microdiscus von der Humboldt Bai stellte 
sich eine vollkommene Ubereinstimmung heraus. Bei beiden kommt die Spirallinie 
vor, die jedoch nur bei mikroskopischer Untersuchung zu gewahren ist, genau wie 
von Dr. ODHNER angegeben wurde. » 
The occurrence of one and the same species in a subfossil state at these two 
separate localities, the one situated in New Guinea and the other in North Queens- 
land, is a fact of considerable interest, as it offers the best thinkable proof of the 
theory of a land bridge between the two countries in a geological period immediately 
preceding the present time. A careful, scientific investigation of the caves at Chil- 
lagoe will certainly reveal many other facts of importance as to our knowledge of 
the zoo-geography of Australia. 
Besides the above-named species, the collection of fossil shells from the Chil- 
lagoe caves contained 2 fragmentary specimens of an Hndodonta (Charopa), one some- 
what defective shell of a Pupa, seemingly not agreeing with any of the known Austral- 
ian species, and with 7 teeth in its mouth, and, lastly, a new species of Pseudopeas 
(Zremopeas), very like P. interioris Tarn in sculpture but differing in shape, inter- 
mediate between this and P. tuckeri. It measured 7.5 mm in length, 2 mm in breadth 
at 9 whorls. The apical whorls exhibited very faint traces of the peculiar sculpture 
described by Piuspry (1906, Man. of Conch., Vol. 18). The recent species of the 
genus are viviparous, and it is therefore of interest that the present specimen, in 
breaking off short during its treatment for examination, delivered a small egg of 1 
mm in length, of ovate shape and somewhat compressed from two opposite sides. 
Though this fact may not necessarily indicate an oviparous nature, it may, however, 
be noted as a fact worthy of the attention of future investigators. 
