2 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



Division of Marine Invertebrates, who personally collected a large 

 number of ascidians at Palau during the High Island- Atoll Project, 

 Palau Islands, 1955, by the George Vanderbilt Foundation, and who 

 kindly made all arrangements for me to carry out the present work. 

 Indeed, without his generous help in providing every kind of facility 

 for me, it would have been quite impossible to study so many speci- 

 mens from various parts of the Pacific. I wish to express my hearty 

 thanks to him for his kindness. 



Included in the material are a number of important collections from 

 the following sources : 



1. United States Fish Commission Steamer Albatross during her 

 North West Pacific Expedition 1899-1900, the Philippine Expedition 

 1907-09, and others; 



2. The Palau Islands, 1955, by the George Vanderbilt Founda- 

 tion; 



3. Various parts of Japan, and presented to the United States 

 National Museum by E. S. Morse, Professor at the Tokyo Imperial 

 University, in exchange ; 



4. From Philippine waters in January 1941, by W. R. Taylor, 

 U.S. National Museum ; 



5. In 1951 at the Gilbert Islands, by P. E. Cloud ; 



6. Dr. S. F. Light, Professor at the University of Amoy, pre- 

 sumably at Amoy, China ; 



7. Ascidians of the university of Hawaii. 



In addition to these, a few specimens from other localities other 

 than the Pacific were examined and described for comparison with 

 the Pacific species. 



Following is a list of George Vanderbilt Foundation (hereafter ab- 

 breviated GVF) stations at which tunicates were collected in the Palau 

 Islands in 1955 by R. R. Harry and H. A. Fehlmann of Stanford Uni- 

 versity and F. M. Bayer of the U.S. National Museum. Geographical 

 coordinates of each locality based upon U.S. Navy Hydrographic 

 Office (HO) charts. Numbers of traverses and islands in Iwayama 

 Bay follow the work of Abe (1937) and of Abe, Eguchi, and Hiro 

 (19>,7). 



Sta. 12. .Tilly. Madalai District, extreme west end of Koror Island, shore 

 at south end of Arakahesan-Madalai causeway, nianffrove shore sradinp; into 

 mud and sand flat: 7°20'36" N., 134°28'13" E. (IIO 6077, 1st ed., 1944). Depth 

 0-3 ft.; bottom of mud inshore grading into sand offshore; vegetation Enhalus 

 acoroides. 



Didemnmn {Didemnutn) ternaianvm (Gottschaldt) ; Eudistoma laysani 



(Sluiter) ; E. pyri forme (Herdman). 

 Sla. 16. 11 July. Madalai District, west end of Koror Island outside of re- 

 taining wall enclosing sandy eelgrass flat. (Outer end of Abe's Traverse III) : 

 7°20'22" N., 134''28'05" E. (IIO 0077, 1st ed., 1944). Depth 3 ft: bottom sand 

 coral, rock ; "olive green compound tunicate on Enhalus leaves." 



Didcmnum {Didemmtm) tcrnafanum (Gottschaldt). 



