70 T. KOMAI : STUDIES ON TWO ABERRANT CTENOPHORES 



(4). The tentacular apparatus also shows no difference from the 

 condition in cydippid ctenophores, excepting that, the tentacle-basis is 

 disposed horizontally instead of vertically, and also that, the shape of 

 the tentacle-sheath has undergone a peculiar modification. 



(5). The colloblast is the same in structure as that of ordinary 

 ctenophores; it consists of a head and two filamentous bodies, one spiral 

 and the other straight, attached to the head. 



(6). In the stomodaeum, the oesophagus is differentiated distinctly 

 from the pharynx; the pharynx is provided with numerous folds on the 

 roof, which are homologous with the i)haryngeal folds of ordinary 

 ctenophores. 



(7). The main part of the canal-system is arranged in nearly the 

 same way as in ordinary ctenophores; the infundibulum sends out on 

 each transverse side a perradial canal, from which proceed two side- 

 branches representing the subpharyngeal meridional canals; the perradial 

 canal runs straight into the tentacular canal which is furcated into two 

 branches that accompany the lateral halves of the tentacle-basis; from 

 each of the branches of the tentacular canal, starts a canal that represents 

 the subtentacular meridional canal. 



(8). The endoderm consists of two kinds of epithelium, viz. the 

 tall and vacuolated epithelium that performs intracellular digestion of 

 food material and the low and ciliated epithelium that serves in circulat- 

 ing water through the canal-s}'stem. The dorsal wall of the canals 

 that represent the meridional canals is lined with a peculiar kind of 

 epithelium which shows a feature intermediate of the above two kinds. 

 The vacuolated epithelium swallows various matters that enter the canal; 

 the refuse matter after digestion is rejected together with small amount 

 of the surrounding plasm in the form of a corpuscle that circulates 

 through the canal-system. 



(9). Cocloplana is hermaphroditic; gonads develop in the dorsal 

 wall of the eight canals that represent the meridional canals of ordinary 

 ctenophores. 



(10), The female gonad arises along the entire length of each of 

 those canals in a continuous linear tract of egg-cells, exactly as in 

 Ordinary ctenophores. Besides the egg-cells, the ovary contains two 

 kinds of glandular cells, one appearing granular and the other clear, of 

 which the former is by far the commoner than the latter. 



(11). Along and close above each ovarial tract, is found a series 

 of deep invaginations of the dorsal epidermis each of which is tube-like 



