175 
In fig. 4 I have given a diagram of the arrangement of the 
mesenteries and tentacles (only part of them are designed) The 
mesentery Mi shows a break in the proximal part and each piece 
IS provided wilh a bunch of craspedonemes of the ciliated tract 
and with a cnidoglandular tract. Also in the mesentery Ma we 
find a similar case, though it is here not accompanied by a break 
of the mesentery. About midway on the mesentery, below the ac- 
tinopharynx, there is namely a small part of the cnidoglandular tract 
developed on a craspedoneme of the ciliated tract. Thus we find 
that in several cases a duplication of the different parts of the fila¬ 
ments takes place. In fig. 5 I have drawn the most proximal part 
of the protomesentery 2 (cc: craspedonemes of the ciliated tract. 
cs; the straight region of the ciliated tract cn: cnidoglandular tract.) 
The off-shoots of the mesogloea in the aboral part of the acti- 
nopharynx were rather low. In the upper part of the siphono- 
glyph there were numerous mucus cells. 
Cerianthus japonicus is nearly related to Cerianthus membrana- 
ceus but differs from this species in particular points. The craspe¬ 
donemes of the ciliated tract in the mesenteries p, are longer but 
fewer in japonicus than in membranaceus. The craspedonemes of 
Ihe other mesenteries are somewhat longer and more numerous 
lere than there. Comparing the length of the mesenteries ps and 
Vil we find that Mi are shorter in membranaceus than in japonicus. 
3. Cerianthus (?) mortensenii n. sp. 
Diagn os is: A large species with unto about 125 marginal 
entacles. Arrangement of the marginal tentacles 2 (dt) 431 | 42 
'* ‘ I . that of the labial tentacles 2 (dt) 313 | 4232 
I . Longitudinal muscies of the column strong. At least 
mesenteries attached to the broad siphonoglyphe. Hyposulcus 
ort, hemisuici distinet. Arrangement and structure of the mesen- 
tnes often very irregular, especially in the region of the proto- 
lesenteries and its vicinity. Directive mesenteries comparatively 
'ng. Ps rather short fertile (sometimes sterile) with the filaments 
uctured as in the oldest m. Pa agreeing with B and b. Arrange- 
ent of the mesenteries in the quartettes M B m b with some breaks. 
1 ong, often reaching to the aboral end, the other M (as a rule?) 
