276 JOURNAL OF COMPARATIVE NEUROLOGY. 
decapitated, but even the decapitated preparation would some- 
times twist itself in two. Chlorhydrate had the same quieting 
effect as decapitation. 
Eunice is very quick in its movements and compares in ir- 
ritability with Polynoe and Nereis. Single induced shocks were 
efficient stimuli, the reacting portion responding generally with 
a single prolonged contraction. 
MIOPMPOLIIWIPPIIIMWIPPPPPPPPPIPIIPOPMIOS_PMVIIVPII PLC IIPIPLIOPPLILIPLLI LI IDID LIL III LIL DL 
Fig. 9. Eunice sp. Postero-anterior. Length of nerve cord between distal 
and proximal electrodes: 9 cm. Rate: 450 cm. persec. Time: 100 d.v. 
per sec. 
The measurements were made after the preparation had 
been killed in fresh water, which gives nearly the same exten- 
sion as when the worm is lying quiet in the aquarium. 
The antero-posterior rate alone was determined. 
EXPERIMENT No. 3, Table IX, postero-anterior, Dec. 26, 1902. 
Distal Proximal 
No. of records 13 12 
Mean latent time 0.050 sec. | 0.038 sec. 
Standard deviation 0.003 sec. | O 0023 sec. 
Coefficient of variability .060 .061 
Length of cord: 5.7 cm. Rate: 474.8 cm. per sec. 
