354 G. H. PARKER 
Repeated tests with carmine and with methylen blue of the 
axial siphonozooid in resting Renillas failed invariably to give 
any evidence of inward currents, and the same was true of indi- 
viduals that were in process of inflation. I, therefore, cannot 
agree with Miller (64, p. 354) in regarding this aperture as an 
inlet, though I fully concur in his opinion that it is an outlet, and 
from the abundance and freedom of its discharge I believe Wilson 
(83, p. 725) to be correct in regarding it as the chief exhalent 
aperture of Renilla. 
The terminal pore of the peduncle 
The question of the presence of a terminal pore at the distal 
end of the peduncle of the sea-pen has been a matter of much dis- 
pute. The historical aspect of this subject has been well sum- 
marized by Musgrave (’09, p. 443). To some of the older natur- 
alists, who regarded the sea-pens as single animals, the terminal 
pore of the peduncle appeared to be the mouth of the animal. 
To others its. very existence was doubted. Miller (64, p. 357 
claimed that there was a pore at the tip of the peduncle of Re- 
nilla, and a smilar condition was reported by Schultze (’64, p. 
360) for Pennatula. Kolliker (72, p. 86) was unable to confirm 
these findings on alcoholic material, but in fresh specimens of 
Renilla amethystina Eisen (’76, p. 13) demonstrated a terminal 
pore by pressing the fluid contents of the peduncle till they 
spurted from the tip of that structure. Musgrave (09, p. 452) 
has given very conclusive evidence for the presence of a group of 
pores about the distal end of the peduncle of Pennatula. These 
pores, she believes (09, p. 457), may serve both as inhalent and 
exhalent apertures. Thus the later evidence very generally 
favors the view that the sea-pens, including Renilla, possess 
terminal pores on the peduncle. 
My own experience agrees very fully with that of Eisen. Al- 
though I have picked up many hundreds of inflated Renillas 
and have many times seen the jet of water issue from the axial 
siphonozoéid, I have never once seen under such circumstances 
water spurt from the tip of the peduncle—a condition that led 
me in the beginning to doubt the existence of a terminal pore. 
