282 JoURNAL OF COMPARATIVE NEUROLOGY. 
preparation fatigues much sooner. The measurements of the 
cord were made on preparations killed in fresh water, with the 
exception of preparation No. 7, Table XIII A., which was ex- 
tended during the experimentation to the length given. 
ah a 
Be EEE OOO OeOOEeeeeeeeeeeeesees@9s@s—_” reo 
oT EEE ESSE 
Fig. 13. Lumbriconerets sp. (b) Postero-anterior. Length of nerve cord be- 
tween distal and proximal electrodes: 30cm. Rate: 681 cm. per sec. 
Time: 100 d.v. per sec. 
EXPERIMENT No. 4, Table XIII, postero-anterior, Aug. 7, 1902. 
Distal Proximal 
No. of records 6 6 
Mean latent time 0.060 sec. 0.035 sec. 
Standard deviation 0.004 sec. 0.004 sec. 
Coefficient of variability -O7 at 
Length of cord: 15 cm. (125 segments). ‘Rate: 600 cm. per sec. 
TABLE XIII A. 
Summary of experiments on Lumértconereis sp. (b) 
ustero anterior rate. 
No. of No. of records _ Length of , 
i . Rate in cm. 
experiment Distal Proximal cord in cm. 
I 4 2 20 40 
Z 5 3 13 
3 3 3 16 
4 6 6 | 1) 
5 4 4+ | 12 52 
6 5 5 15 937 
7 9 8 30 768 
