46 THE MOLLUSCAN FAUNA OF TASMANIA. 
For these reasons, therefore, I have declined to follow the 
example of Mr. G. F. Angas, whose labours in other respects 
have been such a wonderful help to conchology in Australia. I 
of Eutropia, Ranella by the name of Bursa, Modiola by the 
name of Perna. The latter is a good instance of the contusion 
which would result, for Perna is a most important name in 
geology, and means quite a different shell. Nether will I call 
Pectunculus Syed but I need not extend the list, which will, I 
oy see for 
t not As sanaeieac however, that on this account all the 
names are to be rejected which have been ajeouee by the 
necessity of creating new genera. But I not adopted all 
ew me of them appear to me ‘to be erected on 
and more Sree and industrious men have erected after 
such care and labour. But I have been doubtful of their appli- 
cation to Australian siells, and in cases where the genera were 
wholly Australian I may perhaps safely estimate their value, but 
psa what grounds I have always given and will always give 
entific men an opportunity to judge. 
yee the census published by me I did not attempt to mention 
families, except in rare and undisputed instances. With regard 
o now. 
preface: “There is now cok declamation about the wortbless- 
ness of ‘artificial systems and the excellence of nat methods. 
But this excellence is more apparent than real. Many of those — 
natural grou ps which are so much praised are are ill-defined, and it — 
is even acknowledged by their admirers rs that precise limits must : 
ey 
Siete afer ORT 
