172 
pale brown (3 specimens). The part of the column next to the tent- 
acles is always paler than the other part of the column, sometimes 
with an indistinct brown-yellowish annulus. 
Dimensions. Length of the largest specimen 18 cm, breadth 
1 cm. Marginal tentacles unto 3 cm, labial tentacles unto 1,5 cm 
in length. 
Occurrence. Aburatsubo, Misaki. Shallow water, sand, 3 spec- 
imens. Dr. Mortensen’s Pacific Exped., July 1914. Dr. Bocks 
Exp. 1914. 8 specimens. 
Fig. 3. Cerianthiis filiforniis. Transverse section of a part of hyposulcus 
with a directive mesentery. 
The arrangement of the metamesenteries varies a little (figs. 1, 
2, diagrams of 2 specimens). In the specimen designed in fig. 1 
the third mesentery of the first quartette is longer than the first 
mesentery and the arrangement thus mBMb, in the second quar¬ 
tette the first and the third mesentery are of equal length, in the 
third quartette and the following quartettes the arrangement of the 
mesenteries is MBmb. The agroupment of B and b is equal in 
all quartettes, B with their longer ciliated tract form the second, 
b the fourth mesentery in each quartette. In the specimen de¬ 
signed in fig. 2 the metamesenteries are otherwise arranged viz. 
MbmB. Taking only the length of the mesenteries into consider- 
ation, it is true that the agroupment of the oldest quartettes is rather 
MBmb, but a nearer examination of the length of the ciliated tract 
