JENKINS AND Carison, Nervous Impulse in Worms. 283. 
TABLE XIII B. 
Summary of experiments on Lumbriconerets sp. (b) 
Antero-posterior rate. 
No. of No. of records | Length of ) 
experiment Dista Proximal cord in cm. Rate in cm. 
: a) 4 25 ; 80 
2 3 3 8 160 
3 2 fe) 42 
Glycera rugosa Johnson. 
This worm is fairly abundant in the sands of the lower tide 
limits at Pacific Grove. The largest specimen that we collected 
measured from 35 to 40 cm. in length and about 13 mm. in diam- 
eter, when killed in fresh water. It is very ferocious, even in the: 
aquaria preying on Eunice and Nereis. It is also very active, 
ROR igs FNS a th a ce RRO ae ge A la WS er A Se 
NAA 
fig. 14. Glycera rugosa. Antero-posterior. Length of nerve cord between 
distal and proximal electrodes: 30cm. Rate: 441 cm. per sec. Time: 50 
d.v. per sec. 
making its way through the wet sand with great speed or glid- 
ing through the water by the graceful twistings of its whole 
body. This worm was selected for a beginning in this work 
because of its large size, high irritability and strength. Glycera 
is less fragile than any of other free swimming polychetes 
worked excepting Lumbriconereis sp. (a) which equals it in 
this respect. 
