7 8 



ACTINIARIA 



.'--" .-,: :-^vr:^%\iv:a?>v'/i*'S -..*: 



Fig. too. 



Fig. 99- 



Textfigs. 94 101. Limnactinia laevis. 



Fig. 94. Transverse section of a specimen with 8 perfect mesenteries in the 

 upper part of the actinopharynx. Fig. 95. A similar section of the same 

 specimen in the lower part of the actinopharynx. - Fig. 96. Transverse 

 section of a specimen with 10 perfect mesenteries. Figs. 97 101. Trans- 

 verse sections of a mesentery in the reproductive tract. If we indicate the 

 first section (fig. 97) with i, the following sections are the fourth, the eighth, 



the sixteenth and the twenty-third. Fig. 101. 



to the mesogloea as an even lamella. Thjg fifth couple viz. the ventral mesenteries of the dorsolateral 

 pairs, project as imperfect mesenteries a little over the surface of the endoderm; in this state they carry 

 very undeveloped filaments, but no reproductive organs, figs. 94, 95. The mesenteries of the sixth couple, 

 viz. the ventral mesenteries of the ventrolateral pairs, are always very weak and only a little stronger than 

 the mesenteries of the second cycle. 



The ten stronger mesenteries are provided with stomata. As in Scytophoms antarcticus there are 

 several stomata distally placed in each perfect mesentery, they do, however, seem to be less numerous (unto 



