249 
The ectoderm of the tentacles is high. Its nematocysts are of three 
kinds, partly riblike and sparse 14—22 x 1 , 5 —2 /f, partly opaque 
and numerous 11 — 16 x well 2—well 2 , 5 partly with conspicuous 
basal part to the spiral thread and often somewhat curved and nu¬ 
merous 16—24 X 3 , 5 —4 fi. The longitudinal muscles of the ten¬ 
tacles and radial muscles of the oral disc are rather well developed. 
The ectoderm of the actinopharynx contains very numerous giand 
cells and nematocysts, partly 22—28 x about 1,5 i^i, partly 14 x 
1 lii, partly 17—27 x 3 , 5 —4,5 //. The first are numerous, the second 
very sparse and the third, which are broader at their basal end, very 
numerous. 
In the distal part the largest specimen was provided with about 
96 pairs of mesenteries, of which 2 pairs of directives. Below the 
actinopharynx the number of mesenteries is possibly a little smaller. 
The mesenteries of the first, second, third and part of the fourth 
cycles were perfect. The mesenteries of the fourth and fifth cycles 
were often unequally developed, in as much as the one mesentery 
of a pair was stronger than its partner. Below the actinopharynx 
sometimes only the one mesentery of a pair was perspicuous on 
sections. The last cycles of mesenteries are weak. A second spec¬ 
imen had 72 pairs of mesenteries in the lower part of the body. 
The longitudinal muscles of the mesenteries form pennons on the 
three or four first cycles. The pennons are diffuse and situated in 
the middle of the mesenteries. The muscle folds are of ordinary 
and uniform height, stand very close, and are rather richly ramificated 
(textfig. 41). The parietobasilar muscles are weak and form a small 
fold or none on the mesenteries. A small oral stoma is present in 
the perfect mesenteries and often a large marginal stoma in the 
stronger mesenteries. Three transversally and one longitudinally 
sectioned specimens were males. The testes were sometimes well 
developed, sometimes weak. I have observed them in the mesen¬ 
teries of the third and fourth orders. Probably the specimens are 
at the end of a reproductive period as there were no testes in the 
mesenteries of the first and second orders as in other Thoe-species. 
The acontia are well developed and contain two kinds of nemato¬ 
cysts parlly 60—79 x 5 —almost 7 jii, partly 24—31 x about 1 /li, 
the latter are needle-formed. Both kinds are numerous. I have 
examined 5 specimens from Slipper Island and 1 from Kaipara 
