REPORT ON THE ECHINOIDEA COLLECTED BY 
THE UNITED STATES FISHERIES STEAMER 
“ALBATROSS” DURING THE PHILIPPINE EXPE- 
DITION, 1907-1910. PART 3: THE ECHINONEI- 
DAE, ECHINOLAMPADIDAE, CLYPEASTRIDAE, 
ARACHNOIDIDAE, LAGANIDAE, FIBULARII- 
DAE, URECHINIDAE, ECHINOCORYTHIDAE, 
PALAEOSTOMATIDAE, MICRASTERIDAR, PA- 
LAEOPNEUSTIDAE, HEMIASTERIDAE, AND 
SPATANGIDAE 
By Trropor Morrensen 
In presenting the third and final part of the report on the echinoids 
collected by the Albatross Philippine Expedition I want to thank again 
the authorities of the United States Fish and Wildlife Service and 
of the United States National Museum for the privilege of working up 
this important and interesting collection. Special thanks are due to 
Austin H. Clark, curator of echinoderms of the National Museum, for 
his encouragement and help, and above all to Dr. Alexander Wetmore, 
Secretary of the Smithsonian Institution, for permitting me to in- 
clude the illustrations and the more detailed descriptions of the vari- 
ous new forms collected by the Albatross (apart from the cidarids) 
in my Monograph of the Echinoidea; from a scientific point of view 
it is a great advantage thus to have all the illustrations in one place. 
Further, I extend my deep gratitude for permission to study the Alba- 
tross collection in combination with the prosecution of the work on my 
monograph, for this has been a great advantage—much better than 
identifying the various forms simply on the basis of the already exist- 
ing literature. On the other hand, it has caused considerable delay 
in the publication of the Aloatross report. I am indeed grateful that 
1 have had no word of complaint of the long time it has taken me to 
finish this report. 
Foremost in interest among all the echinoids collected by the 
Albatross Philippine Expedition stands the discovery of a Recent rep- 
* resentative of the family Micrasteridae, hitherto known only as fos- 
sils, namely Zsopatagus obovatus. This find vies in importance with 
the discovery by the Siboga Expedition of a Recent echinocorythid, 
Stereopneustes relictus. Very noteworthy also is the discovery of a 
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