16 ART. 5. — T. AIDA. 



quely upward and backward; entirely separated from 

 œsophagus. Right lobe of stomach large; intestine 

 long. Spiracle separated from the posterior end of 

 endostyle by a short interspace. 



The oikoplast epithelium extends posteriorly over the anterior 

 small portion of the alimentary canal. The Eisen's oikoplast is 

 small. The epithelial cells of the lateral oikoplast are small and of 

 a similar size ; among them, a small number of the larger cells 

 compose a round group above the Eisen's oikoplast (fig. 6, PI. II.). 



The most characteristic feature of this species is the large 

 blind-sac of the left stomach {bl, fig. 7-10.). It is of the 

 form of an elongate cone whose base is distinctly separated 

 from the œsophagus, and shows in side view, when combined 

 with stomach, a shape something like that of a shoe. The right 

 stomach lobe is large and trapezoidal ; it is about as broad as 

 the left lobe, with which it is continuous by the entire breadth 

 (fig. 7). The large glandular cells of the stomach are arranged 

 in a sino-le row alono; the base of the left stomach and 

 extend to the middle of the connecting portion of the two lobes 

 (fig. 8, 10). The intestine is long, arises from the lower pos- 

 terior region of the right stomach and opens on the right of 

 the posterior portion of the rectum (fig. 8). 



Nothing can be said at present about the genital organs of 

 this species, as I have found in my single specimen only a residue 

 of them, the contents being entirely lost. 



The tail has a slender muscular coating. No subchordal 

 cells are found in it. The ratio of the length of tail to its 

 greatest breadth is 5 : 1, and that of the greatest breadth of 

 tail to tlie breadth of the muscular layer 2.5 : 1. 



