A’ REVISION OF THE. AUSTRALIAN 
CYCLOSTREMATIDZ AND LIOTIIDZE. 
* By Proressor RatpH Tare. 
[Read September 5, 1899. ] 
PlatesuM ia) Mi 
This communication was submitted to this Society, August 2, 
1898, but by reason of inability to prepare illustrations in time 
for issue in the volume for 1898, its publication was deferred. 
A brief abstract appears, however, on p. 239 of that volume, and 
therein is established the generic names Cyclostremella and 
Pseudoliotia. In the interval some additional information has 
been collected or published, notably the illustrations of Liotia 
Loddere by Mr. Hedley, and that five speeies of Cyclostrema and 
one of Liotia have been elaborated by Dr. Verco, the diagnoses 
of which, and accompanying illustrations in a published form, are 
deferred till his return from Europe ; also, my attention has been 
drawn by Mr. Hedley to a paper by Miss Bush on ‘“‘A Revision 
of Cyclostrema and Related Genera belonging to the Atlantic 
Fauna of America” (Trans. Connecticut Acad., 1897), wherein a 
new genus C'yclostremella is founded, which necessitates a new 
name for the genus typefied by Liotia Loddere. 
The limits of the genera Cyclostrema and Liotia are not so 
exact as to permit in all cases of a safe reference to one or the 
other. 
The conchological characters largely relied on for Cyclostrema 
are a thin vitreous test, entire, simple non-varicosed aperture, 
and a multispiral operculum. For Ziotia, a stout perlaceous test, 
last whorl descending at the front, aperture variced and entire, 
operculum spiral and covered with calcareous granules. As to 
the animal, that of Ziotia is only known, and to'the following 
extent: ‘does not possess intertentacular lobes, but the foot is 
furnished with lateral filaments, as in Trochide” (A. Adams, in 
P.Z.8., 1863). 
As a result of a study of the larger number of Australian 
species embraced in the families Cyclostrematide and Liotiide, I 
find that several species have been wrongly assigned to their 
respective families. Thus, for instance, Cyclostrema micans and 
Liotta Angasi have solid shells, with an entire aperture, but not 
distinctly varicosed ; by comparison of types in the British 
Museum, they are one and the same species, and as the test is 
