193 
Anatomical description. The ectoderm of the scapus is 
rather thick, but considerably thinner than the mesogloea, and con- 
tains very numerous gland-cells. In the high ectoderm of the capi- 
tulum there are very numerous spirocysts 29—41 x 2—2,5 and 
rather numerous nematocysts 19—22 x almost 2—2 /f. The meso¬ 
gloea of the capitulum is thin. The circular muscles of the column 
are very weak, in the capitulum somewhat stronger than in the 
scapus. The sphincter is weak, endodermal, diffuse (textfig. 9) and 
Fig. 9, 10. Condylanthus aucklandiciis. Transverse section of sphincter and longitudinal 
section of the base of one tentacle (fig. 9). Transverse section of tentacle (lig. 10). 
situated close to the tentacles. The ectoderm of the tentacles is 
high and contains rather numerous nematocysts 19—24 x almost 
2—2 jii and numerous spirocysts 12 x l—38 x 2 jn. The longi¬ 
tudinal muscles of the tentacles are mesogloeal, stronger on the 
inside of the tentacles than on the outside, in the latter place the 
muscle meshes are small, in the former large and extended in 
radial direction (textfig. 10). The radial muscles of the oral disc 
are also mesogloeal. The actinopharynx ectoderm is rather high, 
in the ridges supported by mesogloeal thickenings. 
The pairs of mesenteries are in the upper half 12, of which 
2 pairs of directives, and in the proximal part of the body there 
are also a third and a fourth cycle of mesenteries present, p^ossibly 
also traces of a fifth cycle hexamerously arranged. Only the six 
Vidensk, Medd. fra Dansk naturh. Foren. Bd. 77. 
13 
