APPENDICULARIA OF JAPANESE WATERS. 9 



arises from tlic posterior dorsal margin of tlic oikoplnstejii- 

 tlielium ; the ventral one is much smaller and arises from the 

 posterior ventral margin of the epithelium between the two atrial 

 apertures (fig. o, PI. III.). 



Tlie oikoplast epithelium of the anterior jiart of trunk covers 

 only a small anterior part of the alimentary canal. Eisen's 

 oikoplast is wanting, and the epithelial cells of Fol's oikoplast'^ 

 are small and of a simihir size. 



The upper and lo^Yer lips of mouth, which is shifted nearly 

 to the dorsal aspect of the trunk, have each a remarkable ciliated 

 band. The upper band is longer and consists of two lateral parts 

 which are connected by a median zone of smaller cells with 

 shorter cilia. The lower band exhibits largest cells with longest 

 cilia in the middle part (see ed., cv., fig 4, PI. III.). 



The spiracle lies close to the posterior end of the endostyle 

 and anal papilla. The atrial canal is short. The right and 

 left lobes of stomach are of a similar size and are connected 

 with each other by their whole breadth. The posterior blind-sac 

 of the left stomach is of a finger-like shape and ascends upward 

 along the jiosterior side of œsophagus (bl, fig. 2, PL III.). 

 Gigantic glandular cells of stomach are arranged at the base 

 of the left stomach in a single row, and two or three of them 

 are found at the top of the gastric blind pouch and also at the 

 base of the connecting portion of the left and right stomach 

 (figs. 2 and 7, Pi. III.). Both the intestine and rectum are short. 



Testis is paired and extends, when fully developed, to the 

 lateral side of the alimentary canal. Its posterior part, lying 

 behind the alimentary canal, is divided into numerous lobes. The 



1) See likewise Lohmann, /. c. 



