2 Dansk Botanisk Arkiv, Bd. 2, Nr 4. 



value in several cases where the drawings were not determinable, 

 as for instance with regard to the genus Coscinodisciis. 



In a letter Dr. Justesen sent the following remarks concer- 

 ning his plankton researches: »My plankton collections were 

 made during the years of 1909 and 1910 in the Baoe-Baoe Bay 

 on the west side of Boeton island, Lat. 5° 30' S., Long. 122° 

 30' E. [S. E. of the big island of Celebes]. The bay is situated 

 at the southern end of the Boeton Strait near the entrance to 

 the Flores Sea. A very strong current runs through the strait, 

 out or in according to the tides. The depths in the strait are 

 everywhere moderate, not exceeding 100 m.; at the collecting 

 place it measures only 15 m. The bottom and the coasts consist 

 of coral formations. The collecting was made by means of an 

 ordinary surface net (mesh width of gauze not known) towed 

 behind a rowing boat; sometimes the net was used vertically. 

 Samples were taken at all hours of the day, sometimes also 

 during the night (before midnight). During the last part of 

 1910 I found always only organisms which I had seen before 

 and already drawn, and I got the impression that there was 

 nothing more to be found.« 



In the spring of 1913 I had the drawings for closer exami- 

 nation and identified somewhat more than half of the figures, 

 the number of which was about 350. I also examined and made 

 some slides of the common sample, and noted what I was 

 able to identify. But I was prevented from finishing my 

 work by a voyage to the West Indies, and therefore returned 

 the drawings to Dr. Justesen (by chance a few were kept by me). 

 Last year another long voyage followed, and I have not until 

 now had any opportunity of fulfilling my duty by publishing 

 a list of all the protophytes which I have been able to identify 

 from Dr. Justesen's drawings and from the sample. In the 

 following I enumerate only those organisms as to the identification 

 of which I feel pretty sure; therefore the list does not pretend 

 to give a full account of the plankton organisms of the Boeton 

 Strait. Some larger genera (Rhizosolenia, Chaetoceras, etc.) are 

 much richer in species than the list indicates; but many of the 

 drawings did not permit of any idenfication, as the characters 

 necessary for such were not marked. Still, the list is rather 

 long, and shows a large number of species (101) occurring in 

 the plankton of the Boeton Strait. 



The plankton of the Malay Archipelago has been investi- 

 gated by Cleve and, to a lesser degree, by other scientists. The 



