272 JOURNAL OF COMPARATIVE NEUROLOGY. 
TABLE V. 
Summary of experiments on Bispira polymorpha. 
Postero-anterior rate. 
No of No. of records Length of ; 
: SSS - Rate in cm. 
experiment Distal Proximal cord in cm. 
I 12 12 18 691 
= x 2 15 555 
3 2 2 18 817 
4 15 16 20 | 952 
5 16 15 19 729 
6 11 II 17 629 
7 8 8 20 714 
8 4 2 20 | 526 
9 6 4 17 680 
10 1I 7 20 606 
Mean rate: 694 cm. per sec. 
Standard deviation: 93. 
Coefficient of variability: .13. 
Aphrodite sp. 
An undetermined species, probably new, of this interesting 
Polychete occurs in the vicinity of Pacific Grove. As it lives 
in rather deep water and seems not to be common it is only oc- 
casionally brought in by the fishermen. We have secured thus 
- ne. 
eee ee eee 
a en mn Nee | ee 
WU AAAAAAA 
Fig. 6. Aphrodite sp. Antero-posterior. Length of nerve cord between distal 
and proximal electrodes: 8cm. Rate: 52.8cm. persec. Time: 50 d.v. 
per sec. 
far but two uninjured specimens, the largest of which measured 
12cm. in length and 5 cm. in breadth. This worm is very 
slow in its movements and it was found to possess a rather low 
irritability since single induction shocks failed to procure a re- 
action when applied to the distal point of stimulation. The 
