CONTENTS. 
List of Plates ... 
Letter of Transmittal, by E. F. Pittman, Esq., A.R.S.M. 
Author’s Preface 
page. 
v 
vii 
ix 
MEMOIR. 
I.— Introduction 
I 
II.— History of the Discovery of Halysites in Australasia... 
III.— Difficulties met with in an Attempt to identify European 
Species of Halysites ... 
IV.— The General Structure of Au 
V. — Description of the Species 
1. Halysites lilhoslrotonoides 
,, orthopteroides 
2 
3. 
4. 
5. 
G. 
7. 
8. 
9. 
Sitssmilchi 
cratus 
australis . . . 
pycnoblastoides 
peristephesicus 
gamboolicus 
chillagoensis 
stralian Halysites 
VI. — Distribution of the Species in Localities 
\nd American 
3 
15 
23 
23 
25 
26 
27 
29 
32 
34 
35 
36 
38 
VII. — Conclusion 
VIII. — Note on a European Species 
38 
39 
b 
