440 GUSTAF FR. GOTHLIN 
6. The primary cilio-inhibitory mechanism probably consists 
of receptors at the surface of the body, which transfer their 
impulses to a net of nerves. The nerve net in its turn transmits 
them to end apparatuses which inhibit the vibrations of the 
swimming plates, probably by blocking the neuroid conduction 
between them. At any rate, there is present an inhibitory mech- 
anism acting at a distance in an animal that has no central ner- 
vous system. | 
7. The mechanism for primary inhibition also functions in 
specimens whose statolith apparatuses have been removed by 
operation, if one only waits for the moment when the stimulatory 
effects of the operation have disappeared. 
8. There is an intimate connection between primary and sec- 
ondary (i.e., muscular) inhibitory mechanism in Beroé. It is 
probable that they both use the same receptors, but the primary 
mechanism can be caused to function by impulses of weaker 
intensity than the secondary one. 
