256 
mesentery and form only low folds but no distinet pennons. They 
are somewhat stronger on the directives. The parietobasilar and 
basilar muscles are weak. The filaments are of usual structure as 
also the acontia, the nematocysts of which are small and only 14— 
19 X 1,5 —almost 2 jii in size. The six first pairs of mesenteries are 
Figs. 48, 49. Cricophorus nutrix. Fig. 48. Longitudinal section through a part of the 
column with a beginning brood-room. Fig. 49. Longitudinal section through the upper 
part of the brood-pouch (compare the text). 
Sterile as also the fifth cycle, if present. The species is monoecious, 
ovaries and testes are present in one and the same mesentery (4 
specimens exam.ined). Sometimes the ovaries, sometimes the testes 
are more numerous. In a specimen from Cape Maria van Diemen 
the testes were extraordinarily sparse. The reproductive organs are 
developed in the second, third and, in larger specimens at least, in 
part of the fourth cycle. 
This species is very interesting as provided with a circular 
brood-pouch in such a simple form as not before observed in 
