242 
4. In the latter half the mesenteries were almost regularly devel- 
oped, between the perfect pairs there were mesenteries of a second, 
third and fourth order intercalated, only a pair of the fourth order 
was lacking. In the other half the arrangement was more irregular, 
only between one of the directive pairs and the adjacent perfect 
pair the arrangement was regular. In the uppermost part of the 
body the mesenteries are more numerous, probably about 160, just 
as the number of tentacles. Also in the uppermost part of the act- 
inopharynx only 8 pairs seem to be perfect (controlled by dissec- 
tion); it is, however, possible that some of the mesenteries of the 
second order reach the actinopharynx with a small flap. In one spec- 
imen from Kaipara there were in its uppermost part 6 pairs of 
perfect mesenteries and 2 siphonoglyphes of the same structure. In 
another specimen from the same locality I have found 9 pairs 
of perfect mesenteries, three pairs on one side of the two direc- 
tives and four on the other. The extra-pairs are situated in the 
vicinity of the one directive pair, and their pennons are weaker 
than those of the other perfect mesenteries. The siphonoglyphe, 
connected with this directive pair, is weaker than the other. The 
mesenteries are thin, except at the pedal disc and in the region 
of the pennons. The mesenteries of the first and second order are 
namely provided with well developed diffuse pennons in their inner 
half (textfig. 37). Also the mesenteries of the third order show a 
tendency to form pennons. The other mesenteries are very weak. 
The parietobasilar and basilar muscles are weak. The mesenteries 
of the first, second and at least part of the third orders are furn- 
ished with filaments. On the second and third order the filaments 
begin rather far down at the under part of the actinopharynx, the 
whole upper part of these mesenteries seem to lack filaments. The 
filaments are of the usual structure. The mesenteries of the first, 
second and most of the third order, inclusive the directives, were 
fertile. The species is dioecious. The nematocysts of the acontia 
are of three kinds, partly 46—70X5 — 6 fti, partly 13—17Xabout 
1 ,5 f-l, partly 17—1 9X2,5— 3 both the former very numerous, 
the latter sparse. The basal thread of the largest capsules is per- 
spicuous; the smallest nematocysts are almost of uniform breadth 
and at one end acuminated as a pin, the short and broad capsules 
are provided with a visible basal thread, broader at the basal end. 
