CERIANTHARIA. 



I i T rr 



Text-figure i. Diagram of the arrangement of a part 

 of the mesenteries with stomatodaeum and siphono- 

 glyph in Pachycerianthw multiplicatus. Here as in the 

 text-figures 4, 5, 7, the mesenteries are marked with 

 lines in the region of the stomatodaeum; nd by m,m 2 

 etc. are rather too strongly marked, x: see text! The 

 line below the mesenteries indicates here as in figures 

 4, 5, 7 the aboral end of the body. For the other 

 signs of the figure see the explanation of the Plates. 



extremity of the body. On the right side were found 

 19 large mesenteries of the ist cycle besides 4 lesser 

 ones, of which the ist reached 2 /3 the remainder 1 J 2 

 or J / 3 of the space just mentioned. The number 

 of mesenteries in specimen E was therefore about 

 1 60, in A about 170. 



The following description is chiefly based 

 on specimen A, as the other specimens were not 

 well preserved enough to be adapted for anatomical 

 study. When I speak of the length of the mesen- 

 teries in relation to the length of the column, there 

 is to be understood here, as in general with the Ce- 

 riantharia, only the portion of the mesenteries and 

 column that lies below (aborally from) the aboral 

 border of the stomatodaeum. Below, I have in most 

 cases called the column below the end of the sto- 

 matodaeum the column in a strict sense.. 



Protomesenteries : The directive mesenteries 

 are sterile and very short, the right mesentery rather 

 longer than the left, the free edge is straight. The 

 hemisulci run a long way down as a small filament 

 of the directive mesenteries. 



Protomesenteries 2 (PL 2, Fig. i) are compara- 

 tively short and extend about a fourth part of the 

 length between the lower border of the stomato- 

 daeum and the aboral pole. The left mesentery is 

 somewhat longer than the right. The region of 

 the ciliated tracts is long, slightly folded with short 

 craspedonemes. The cnido-glandular tract is little 

 developed. The mesenteries are in the aboral part 

 very small in comparison with other sterile mesen- 

 teries. On the mesentery reproduced appears an 

 aboral small lobe, which at its extremity supports 

 craspedonemes. They are sterile. 



Protomesenteries 3 (PI. 2, Fig. 2) are sterile, 

 shorter than P. 2 and considerably broader in the 

 craspedoneme- and cnido-glandular region. The 

 right mesentery is rather longer than the left. The 

 craspedoneme region is inconsiderable compared 

 with the cnido-glandular tract. The latter is very 



