207 
one of them (from Bay of Islands) more typical than in the other; 
in one specimen (from Bay of Islands) concentrated diffuse (textfig. 
16). The endoderm of the column, tentacles and oral disc is strongly 
pigmented, in the other parts of the endoderm the pigment cells 
are more sparse. The endoderm lacks Zooxanthellae. The ectoderm 
of the tentacles is high and its nematocysts very numerous, the 
folds of the longitudinal muscles high and palissade-like arranged. 
The number of mesenteries varies and is, at it seems, always 
somewhat larger than that of tentacles. In the specimen with 66 
tentacles there were 39 pairs of mesenteries, a short distance be- 
low the tentacles, in the under part of the body, 45 pairs, in the 
specimen with 75 tentacles 45 pairs in the upper part, in that with 
99 tentacles 58 pairs in the under part of the column. The largest 
number of mesenteries which I have observed, in a specimen from Slip¬ 
per Island, was 122 (33 x 29 pairs), this specimen had 94 or pos- 
sibly 96 tentacles. The examined specimens were furnished with 
1—3 pairs of directives, corresponding to the siphonoglyphes. In 
the two specimens with 3 pairs of directives the directives were 
the first, seventh and twenty-seventh (resp. twenty-sixth). The 
muscle pennons were diffuse and ordinarily developed, in their under 
part somewhat more concentrated than in the upper, where they 
were broader. The parietobasilar muscles were strong, very broad 
in their under parts and forming a distinet fold inwards. Part of 
the muscles are enclosed in the mesogloea. The basilar muscles 
were very strong. All stronger mesenteries except the directives 
were fertile. The species is dioecious. 
The size of the nematocysts (n) and spirocysts was as follows: 
North Cape Slipper Island 
Column (n) 16—22Xalmostl,5—— 19 X 1 ^ 5 ^. 
Tentacles (n) 19—29Xalmost 1,5—2,5. 21— 29 X 1 , 5 —about 2. 
„ (sp) lixalmostl — 19X1,5. 12Xalmost 1—24X1,5. 
Actinopharynx (n) 22—29Xalmost 2—2,5. 25—31 X2. 
„ 24X4. 26X5. 
Column (n) 
Tentacles (n) 
(sp) 
Actinopharynx (n) 
Slipper Island 
25—31X2—2,5. 
24X5. 
Bay of Islands 
15— 19 X 1,5 
20—27x 1,5—2 (2,5). 
12X 1—22X 1,5. 
24—26 X about 2 (.i. 
