PRIMARY INHIBITION OF CILIARY MOVEMENT 405 
MATERIAL AND ARRANGEMENTS FOR THE EXPERIMENTS 
The form of Beroé that is obtainable at the west coast of Swe- 
den is Beroé cucumis Fabric. According to Th. Mortensen (’12, 
p- 85), it is the same species as the Boroé evata D. Ch. that occurs 
in the Mediterranean. 
The catches were made with a plankton trawl at the deepest 
part of Gullmar Fjord at a depth of 50 to 100 meters. During 
the month of July there were caught in this way thirty-seven 
Boroé specimens, varying between 13 and 26 mm. in length and 
appearing uninjured when examined macroscopically. The 
chief officials at the station placed them all at my disposal for 
my experiments. I wish to take this opportunity of thanking 
Prof. Hj. Theel and Dr. Hj. Ostergren for this act of kindness. 
The boat used for catching the animals had on board glass 
aquaria of about 6 liters’ cubic capacity, which were filled with 
deep sea-water at the place where the catches were made and 
were kept cool with ice. The Beroé specimens were transferred 
immediately to them from the glass jar of the trawl by means of 
small glass bowls. During the transference the greatest care was 
taken, as far as circumstances allowed, to separate all the other 
animals that had been collected in the trawl.! Immediately on 
arrival the aquaria were put in a cooling safe, where the tempera- 
ture was kept at 13 to 15°C. by means of ice. Asarule, daily the 
water in the aquaria was changed for fresh water taken from a 
depth of 15 to 20 meters. The experiments were carried out on 
the days immediately following the catch. Some of the cap- 
tured animals were still alive and in good condition a fortnight 
after the experiments on them had been completed. 
In the aquaria the animals lived mostly at the bottom. Speci- 
mens that had a specially lively ciliary motion remained there 
upright with their longitudinal axis vertical and their mouth 
pressed against the bottom of the aquarium. Individuals with a 
less violent ciliary motion, on the other hand, took up a horizon- 
1 In addition to a large number of copepods there occurred regularly specimens 
of Meganyctiphanes norvegica, usually also of Sagitta, and in a few cases of 
siphonophores, medusae (EKutmalphes and Aglantha) and the annelid Tomop- 
teris Helgalandica. 
