11 



llu' Mininier of 1920 Mr. G. L. (1 iiifl ii ii d ;il my request undertook to 

 collect a series of planklou samples (by means of the wash-deck pump) 

 on a trip to Huenos Aires. The result was remarkably i)oor, only two of 

 the sam])les containing any Echinoderm larvie at all; still some information 

 was gainetl liiieby also. Furthei', .Mr. II. Faye, St. Cruz, West Indies, 

 undertook lo collect sonu' plankton samples for me in the liarbonr of 

 Chri-stianssled, which conlaincd several interesting Kchinodcrm larvae. 

 To all these gentlemen I beg lo tender my best lhaid<s for this assistance. 

 Plankton samples were generally taken at the dilTerent places in the Pacific 

 where longer stay was made: not few important and interesting forms of 

 larvae have been secured in that way, especially of the Ophiuroid-larvae 

 which are generally found quite well preserved in such plankton samples: 

 descriptions of such forms are included in the following report. On the 

 author's expedition to Siam in 1899 1900 there were also collected several 

 Echinoderm larva\ which are likewise included in the present report. — 

 It may, however, be emphasized that by no means all the larvaj thus 

 collected have been described here. Only such as were found to present 

 special and noteworthy features or that could be identified with forms 

 hitherto described and thus alToiding zoogeographical information have 

 been included. 



It is a very agreable duty lo me lo express my indebtedness and sincere 

 thanks to all those authorities and colleagues who have rendered me 

 assistance on my voyage or otherwise in connection with this work. First 

 of all my thanks are due to the Carlsberg Fund which by its liberal 

 grant made it |)ossible for me lo lealize my plan of Ihe r^x|)edition lo the 

 Pacific, and from which grants were also received for ])ublishing this 

 report. A special grant was also given me from the Danish Govern- 

 nunl loi' enabling me to complete the reports on the material from my 

 voyage. — Adopting a chronological arrangement 1 then beg lo address 

 my sincere thanks to the director of the Biological Station at Misaki, 

 .Japan, Professor 1. Ijima, Tokio, and Dr. Fujita. then .Vssistant at the 

 said Biological Station; to Professor W. A. Haswell and Dr. S. .Johnston, 

 at the University of Sydney; Professor H. B. Kirk, Wellington: Professor 

 W. A. Bryan. I lonolulu, and Mr. D. Thaanum, Ililo, Hawaii; Dr. 

 Ch. MacLean Fraser, Director of the Biological Slaliou, Xanaimo, 

 Vancouver B. C. : Professor Wm. Bitter, Director of the Biological Sta- 

 tion of the Scripps Inslitution. La .lolla, Galifornia: Professor .lames 

 Zetek. Panama, and Professor .V. (i. Mayor, Director of the Depart- 

 ment of Marine Biology of the Carnegie Institution, Washington D. C. 

 A special thank I owe to the New Zealand (iovernmenl for inviting 



