APPENDICULARIA OF JAPANESE WATERS. 19 



species, were often (jbtainod. The tail contains a dense cM^nncctive 

 tissue, which is of a violet color along the margin and red in 

 the niidtUe of tail. The trnidv is i)ale red. The paired uvary 

 and testes are inclosed in a gelatinous substance. The subchordal 

 cell of the tail I have failed to see, perhaps because of its being 

 hidden by the thick connective tissue. In view of the identity 

 in all other important characters, those individuals undoubtly 

 belong to tlùs species and are probably to be considered to re- 

 present a variety of it. 



7. Oihoplenra dlolca FoL (1872.). 

 PI. IV., figs. 7-11. 



Buccal gland and Eisen's oikoplast present. Œso- 

 pliagus opens to the left stomach at the posterior upper 

 corner; without diverticulum to stomach. Ovary and 

 testis in different individuals. Tail with two sub- 

 chordal cells and narrow muscular layer. 



The oikoplast epithelium extends over the anterior half of 

 the alimentary canal (fig. 7, PI. IV.). The cells of the lateral 

 oikoplast zone are large and spherical. The buccal gland is very 

 small. The Eisen's oikoplast is large and circular, composed of 

 four large cells. The endostyle is short ; its posterior end situa- 

 ted in the neighborhood of spiracle. 



This is the only species in my collection, in which I have 

 observed the interposed layer'^ in the ' Hausanlage.' It is repre- 

 sented by small dots arranged in five distinct rows, similarly on 

 both sides of the trunk (fig. '9, PI. IV.). 



1) "Einlagerung" of Lühman^. 



