2 THE VOYAGE OF H.M.S. CHALLENGER. 
To Professor Perrier and Monsieur Poirier of the Museum of Natural History, Paris ; 
to Dr. de Mann, late of the Leyden Museum, and to Professor von Martens of the 
University of Berlin, I am indebted not only for every assistance while engaged in the 
examination of the collections under their charge, but also for much personal kindness. 
To Mr. R. Etheridge, sen., F.R.S., to Professor P. Martin Duncan, F.R.S., and 
especially to Mr, 8. O. Ridley, M.A., I am indebted for much information and assistance 
on various points ; while to Professor Moseley I am under obligation not only for sug- 
gestions of different kinds, but for assistance which I have derived from his published 
Notes by a Naturalist on the Challenger, in giving an account, where possible, of the 
conditions under which the Corals flourished on the reefs. 
The plates have been drawn under my constant supervision, and I should like to 
make a special acknowledgement of the great pains which the artist, Mr. Gawan, has taken 
with them, and of the skill which he has brought to bear on them. 
TABLE OF CONTENTS. 
PAGE 
PREFACE, 1 
INTRODUCTION, . ; ; 3 
On the Reef-Corals described, 3 
On Distribution, : : : p . ; P , 5 : 5 
On Classification, ; : : : : ; : é , 7 
On the Literature, 8 
DISTRIBUTION, . F 9 
Atlantic Region, : < ; 9 
Pacific Region, . ; 5 : ; : ‘ c : : “ 14 
GenERAL Resvutts or DistrIBuTION. 
Tabular view of the number of Genera and Species obtained, with their Localities, : : 33 
Distributional areas, . 5 é F : ; é 2 : : 34 
Bathymetrical limits to distribution, . 5 : 5 . , : ‘ 35 
Thermal limits to distribution, . ‘ ‘ : . : : : : 35 
Peculiar cases of distribution, . : ‘ ; : : ; ‘ 36 
CLASSIFICATION, : F : : ‘ P : : : ; : 37 
Tabular view of the Families and Genera in the collection, P : 3 j ; 45 
DesoripTIONS OF GENERA AND SPECIES. 
Family Oculinide, ; ; , : 4 ; 3 ; , ; 47 
»  Pocilloporide, . : . : 2 : 3 : g : 57 
»  Astreide, : ; : : ; : : ‘ 5 : 70 
»  Cyathophyllide, : 5 : : ; : ; 5 INK) 
»  Llesiofungida, . : : : . : ‘ : : 4) ills} 
»  Cycloseride, . : ; ; : ; : 3 . 2 Luly 
»  Fungide, ; : ; : ; ; : 2 : 30 
»  Eupsammide, . : , é : . ° : eee 
», Madreporidea, . : : ; : : 3 : nn - 147 
»  Poritide, : : : ALS 
» Milleporide, . , : se ; P : : ; on el'90 
INDEX, - - : : : : : : : ; : 5 195 
