195 
senteries, except the pennons, are thin and lamellar, as is also the small 
parietal part of the mesenteries. In the lower half the mesenteries show 
another structure. The pennons, indeed, retain their character but are 
here considerably weaker and, ^ 
in comparison with the parietal 
part of the mesenteries, incon- ( 
siderable (textfig. 13mp). In the 
undermost part they are yet 
somewhat stronger. The lower 
half of the mesenteries are na- 
mely considerably thickened in 
the here broad parietal region, 
and the longitudinal muscies 
richly ramificated on the pennon 
side as well as especially on the 
parietobasilar muscie side (text¬ 
fig. 13). At the same time as 
the pennons diminish, the 
parietal part increases and vice 
versa. The ova in the mesen¬ 
teries were very large. 
The muscies of the mesente¬ 
ries of the second cycle recall 
the parietal part of those in the 
First cycle. Thus they are strong 
in the lower half (textfig. 13), 
weak in the upper. The mesen¬ 
teries of the third and fourth 
cycles are weak, in their upper- 
most part not reaching above 
the endoderm of the column W 2 
part of the body. The filaments 
Fig. 13. Condylanthus aucklandicus. Trans¬ 
verse section of one mesentery of the first 
orcler, of one mesentery of the second 
and of 2 mesenteries of the third order in 
the under part of the body. mp: pennon. 
1, and only present in the lowest 
are of usual structure. 
Fam. Actiniidae. ' 
According to Stephenson (1921, p. 528) there is no real 
difference between the families Bunodactiidae and Actiniidae as 
the sphincter in the former sometimes agrees with that in the latter. 
13* 
