194 
tention is however called to the faet that the animal was more 
contracted in the hyposulcus region than tn P"" ^ 
Probably there are no distinet hemisulei. A diagram of the oldest 
mesenteries is given in textfigure 16. The second 
protomesenteries pa were provided with a long 
eiliated traet, 1 have not examined these mesent¬ 
eries as regards the eraspedion region. The endo- 
derm of the p 2 , M- and m-mesenteries were pro- 
liiillpi; 
I -'h' 
I i >■.' 1"" 
II IIP" 
vided with numerous, eurved, large nematocysts, 
laeking in ps, B and b. The limit between the 
eiliated traet and the eraspedion region in the ex¬ 
amined Mi-mesentery was somewhat below half 
the subpharyngeal length of the mesentery (in 
the textfigure 16 indicated by a transverse line). 
The strueture of the eiliated traet was in the 
upper parts of M and m aeeording to type 1, m 
the lower parts aeeording to type 3, in B and b 
aeeording to type 3. The eraspedion region was 
not invaginated in the median line. The aeontoids 
were provided with well developed longitudinal 
museles. numerpus giand eells, and few nemato- 
YigA&. Årachnanthus cyStS. 
iiocwi. Diagram of ihe _ reproductive organs were very small and 
arrangement of the __„.t „niv a few small OVa 
mesenteries. 
sparse. 1 have observed only a few small ova 
in the sectioned M i-mesentery. 
The eetodermal mesentery in the column was comparatively 
strong. The longitudinal muscles in the mesenteries, situate as in 
other Ceriantharia, examined by myself, were comparatively richly 
folded in the vicinity of the actinopharynx. 
As it is probable that the size and strueture of the cnidae a\so 
in Ceriantharia may be a matter of importance for the identific- 
ation of the species. 1 have given a table of the size of the nemato^ 
cysts in the actinopharynx and in the cnido-glandular traet of the 
filaments. In the actinopharynx there are three sorts of nematocys s 
1) some with very coiled thread, 2) large, sometimes curve 
cysts with the visible basal part to the spiral thread reaching throug 
,he whole length of the capsules and 3) smaller nematocysts with 
