SuteR.—On New Zealand Mollusca. 127 
A short time ago I examined the dentition of thirty-two 
land-shells from Tasmania, and found them mostly to belong 
to the sections Flamnulina, Gerontia, Phacussa, Allodiscus, 
Thalassoheix, and Phrixgnathus, hitherto known from New 
Zealand only. Afterwards I had an opportunity of examining 
the dentition of a land-shell from South Africa, a typical form 
of the section Pella, Albers, which, to my great surprise, 
showed the very same peculiarities in jaw and radula as are 
characteristic of our genus Hlammulina. All this leads me to 
think that Flammulina and allied forms belong to the antarctic 
fauna, which at a very remote period may have lived on the 
supposed antarctic continent, and of which remnants are now 
found in New Zealand, Tasmania, South Africa, and—why 
not South America also ? 
I hope that some day the dentition of the Amphidoxa 
species from Juan Fernandez will be made known, and I 
should not be astonished to see them (and perhaps Stephanoda 
also) nearly related to those forms I now include in the genus 
Flammulina. 
10. Thalassohelix igniflua, Reeve, and Th. obnubila, 
Reeve. 
Professor Hutton was the first to recognise the absolute 
identity of the two species (Trans. N. Z. Inst., vol. xvi., p. 203). 
In the ‘‘ Reference List’’ (l.c., p. 636), by Mr. Hedley and 
myself, however, my friend made Zh. obnubila a variety ot 
Th. igniflua. This difference of opinion caused me to look 
once more at the specimens in my collection, and to compare 
them carefully with the diagnoses of the two species. It was 
easy to pick out a few specimens corresponding with each otf 
the species mentioned, extreme forms; but, besides these, 
there were many intermediate forms, and IL again came to the 
same conclusion as Professor Hutton, that they are all one 
and the same species, and that there is not even a possibility 
of making out a constant variety. Zh. igniflua, the large, 
brighter, and smoother form, is found in open country, amongst 
shrubs, tussocks, &¢.; whilst the smaller, dark-coloured, and 
strongly striated and plaited Th. obnubila occurs in the dark 
native bush. The differences in the shell seem to be due to the 
influence of the habitat only. The dentition 1s the same in 
both. 
An example of similar variability is Thalassoheha fordet, 
Brazier, of Tasmania, of which no less than about twelve 
Species have been made. 
1l. Endodonta, Albers. Plate XV., figs. 12-14. 
The first New Zealand species of this genus made known 
to science is EH. cryptobidens, Sut. (Trans. N.Z. Inst., vol. 
