IV. INTRODUCTION. 



the habitat of two is as yet unknown, and the remainder are, as far as 

 yet known, confined to small areas as noted in the context. Several 

 eminent conchologists have divided the Helicidce into numerous sub- 

 genera, but I have refrained from adopting any system of sub-division, 

 and simply give the various species, so far as practicable, as they ai-e 

 related to each other. I have not given all the references to the 

 numerous scientific works in which many of the species are mentioned, 

 but I think sufficient are given for all practical purposes. I have pre- 

 ferred to copy verbatim the descriptions and measurements of the 

 species enumerated in Dr. Cox's "Monograph of Australian Land 

 Shells," and the same with respect to those in Mr. Legrand's book, 

 adding my own observations as to the distribution and variation 

 of the species. My friend, Mr. E,. M. Johnston, has suggested a table 

 showing their distribution over the island, and at my request has drawn 

 up the one appended, which I think will be found very useful. In 

 collating this monograpli, I am much indebted to Professors Tate and 

 Hutton, and Messrs. Legrand, Brazier, Kershaw, R. M. Johnston, 

 A. Sim)j^son, and C. E. Beddome, for much valuable information 

 and kindly help. Were it not for the ready assistance of these 

 friends my efibrts would have been poor indeed ; as it is, I have 

 no doubt some errors have occurred, but I hope the matter will be 

 stUl further investigated, much more knowledge gained, and my errors 

 corrected. My labour has been one of love, and as it is I ofier it to my 

 friends and all interested in the development of conchology, hoping they 

 will overlook its many shortcomings. 



The measurements of the new species are given in French 

 millimetres. 



Brisbane-sto'eet, 

 Launceston, Tasmania, ' • 



April 10th, 1879, 



