REPORT ON THE ECHINOIDEA COLLECTED BY 

 THE UNITED STATES FISHERIES STEAMER 

 "ALBATROSS" DURING THE PHILIPPINE EX- 

 PEDITION, 1907-1910. PART I. THE CIDARIDAE 



By Theodor Mortensen 



Of the Zoological Museum, University of Copenhagen, Denmark 



INTRODUCTION 



In presenting herewith the first part of the Report on the Echi- 

 noids, collected by the Albatross Philippine Expedition, the author 

 begs to express his sincere thanks to the authorities of the United 

 States Bureau of Fisheries, of the Department of Commerce, and of 

 the United States National Museum for the privilege of working up 

 this most important collection. Special thanks are due to Mr. Austin 

 H. Clark, the Curator of Echinoderms in the United States National 

 Museum, as also to Dr. H. L. Clark, Museum of Comparative Zoology, 

 Harvard College, Prof. R. Koehler, Lyon, and Prof. L. F. de Beau- 

 fort, director of the Zoological Museum, Amsterdam, for much impor- 

 tant help in various ways in connection with this work. 



The work was begun several years ago, but had to be laid aside 

 for some time on account of the author's absence during his expedi- 

 tions to the Pacific in 1914-1916 and to the Kei Islands in the Malay 

 Archipelago in 1922. The delay thus caused in the working up of 

 the collection is, however, far outweighed by the fact that the ample 

 echinoid material brought together by the author from various parts 

 of the Pacific region has proved to be of the greatest importance for 

 the study of the Albatross collection. Thus it may well be said that 

 without the goniocidarids, collected by the author at the Kei Islands, 

 it would hardly have been possible to have reached a satisfactory 

 conclusion in regard to various small goniocidarids in the Albatross 

 collection — Rliopalocidaris Mrsutispina, var. viridis, Schizocidaris ser- 

 raia, and Schizocidaris fasciata. 



The present first part of the report on the Albatross cchinoids deals 

 only with the family Cidaridae. The number of species and varieties 

 of this family represented in the collection amounts to 27. Of these, 

 6 species and 7 varieties are new to science, 2 of them representing 



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