INTRODUCTION. 



25 



were Roema Manoeal , Nanga Raoen , Poetoes Sibau and 

 Poelau. The strange looking fact may be stated here that 

 at Nanga Raoen, above the numerous rapids oftheMandai 

 River, several species of sea-fishes , for instance a species 

 of Sole and a Hemignathus , were collected. 



It may interest our readers to know , that the work of 

 the expedition is still being continued in Borneo , Dr. Nieu- 

 wenhuis having once more started for the Upper Mahakkam 

 with a staff of collectors , and that , according to the latest 

 news he will have left the Upper Mahakkam medio March 

 with fine zoological collections and probably will now 

 have reached the East-coast. 



I cannot close this introduction without expressing my 

 thanks in the first place to Resident Tromp , who most 

 energetically and efficiently assisted us in every way and 

 to whom undoubtedly a large share of the success of the 

 expedition is due, and also to the high officials, the As- 

 sistant Resident Snellebrand and the Controleur W. van 

 Velthuysen. To both the latter, as well as to the Contro- 

 leur of Sanggau, Mr. L. 0. Westenenk, Dr. Goedhuis at 

 Sintang, and Captain Cajaux at Pontianak , and to my 

 collaborators , especially Dr. Nieuwenhuis , 1 am indebted 

 for many interesting contributions to my zoological collect- 

 ions. These latter have become the property of the Zoolo- 

 gical Museum at Leyden. 



Leyden Museum, April 1897. 



Notes from the Leyden Museum , ^Vol, XIX. 



