( no ) 



Zoology. — "Some results of the investigation of the Cirripeds col- 

 lected during the cruise of the Botch man-of-war "Siboga" 

 in the Malay Archipelago." By Dr. P. P. O. Hoek. 



Having explained the position the Cirripeds occupy in the Class 

 Crustacea the author emphasized first of all the great advantage or 

 possessing Darwin's well-known Monograph l ) when studying the 

 animals of this group. This book may still be considered as a model 

 for similar monographs, not only in treating the Sub-Class from a 

 general point of view, but also for the description of the different 

 species. 



As might be expected the study of the material collected with the 

 "Siboga" has considerably increased our knowledge concerning the 

 biology, the mutual relations and the anatomy of these animals : a 

 few interesting cases have already been communicated to the Academy') 

 and a more detailed treatment is given in the Report on the group 

 published in the Results of the Expeditions edited by Prof. Max 

 Weber. The first part of this Report on the Cirripeds was published 

 in September 1907, a great deal of the second part and the deter- 

 mination of nearly the whole material has been achieved by this time. 



To have an idea of the importance of the material collected by 

 the "Siboga" it is worth while to compare it with that obtained 

 during the English expedition with the "Challenger". The English 

 man-of-war the "Challenger" made a cruise round the world, which 

 lasted about three years and a half, and brought home collections 

 from nearly all the oceans and seas of the earth's surface; the 

 Cirripeds collected during that cruise were also worked up by the 

 present author, the report on the group w r as published in 1883. 

 From the accompanying table it may now be seen that the material 

 collected by the ,: Siboga" in the course of one year, and, comparat- 

 ively speaking, in an area of limited extension, is not inferior to 

 that of the "Challenger" ; the latter, how r ever, collected the greater 

 part of its spoil from the bottom of the great oceans of the world 

 where as a rule the depth was very important. The "Siboga" on 

 the other hand, had better opportunity to investigate coasts, reefs 

 etc. Hence it is easily understood that whereas the "Challenger" 

 from depths to over 5000 m. obtained a richer collection of true 

 deepsea-animals, the "Siboga" succeeded in collecting along with an 



l ) Darwin, Gh., Monograph of the Subclass Cirripedia (in 2 Volumes). Vol. I. 

 The Lepadidae or Pedunculated Girripedes, 1851; Vol.11. The Balanidae (or Sessile 

 Girripedes); The Verrucidae etc. 1854. London: Printed for the Ray Society. 



~j Proceedings ol the Academy of Sc. of June 25th, 1904 and January 27th, 1906. 



