190 



DR. A. ARNBACK-CHRISTIE-LINDE ON THE 



In some individuals another sac-like structure, generally of 

 greater size, has been observed. It is situated at the upper side 

 of the above-mentioned one, and projects like the latter into the 

 common test. When an individual contained developing 

 embryos, they were enclosed in this sac. No doubt it develops to 

 receive the embryos, and it is consequently to be regarded as a 

 brood-pouch. 



In the zooids most advanced in development there are thus 

 two pouches which are to be referred to the reproductive organs 

 (cf. text-fig. 2). 



In the individuals examined, reproductive organs have been 

 observed only on the left side of the body; they are placed ventrally, 

 .on the outer side of the mantle, and are embedded in the test. 



Only one genital pouch — consequently only one brood-pouch — 

 has been observed in each zooid. If the individuals are seen from 

 the inside of the colony, the position as well as the number of the 

 organs in question is easily determined. The members of the 



Text-figure 3. 



b r at 



KUJcenthalla borealis (Gottsch.). 



Zooid seen from the left side, test partly removed. X 7. 



at. Atrial aperture, br. Branchial aperture, b. Bud. gp. Genital poucli with 



testis and ovary, ce. (Esophagus, r. Rectum, s. Stomach. 



colony are arranged in one layer and are placed close to each 

 other side by side ; only the ventral part is free. From here the 

 reproductive organs extend between the individuals, and only one 

 genital pouch is visible between them, projecting from the left 

 side of each zooid. 



As in the genus Gynandrocarpa, the reproductive organs of 

 KUkenthcdia seem thus to consist of a single hermaphrodite 

 structure. In the former it is placed on the right side, in the 

 latter on the left. 



In the different zooids of the same colony the reproductive 

 organs show various degrees of development. In some zooids the 

 genital pouch with the gonads was very large and of considerable 

 length, in others it was hardly distinguishable (cf. text-figs. 2 &, 3). 



