20 AET. 5. — T. AIDA. 



The left stomach is quadrate and joins the right stomach 

 by its entire breadtli. The œsophngus opens into it at the upper 

 posterior corner. The œsophageal wall gradually passes into that 

 of the stomach, which produces no diverticulum behind (fig. 7 

 and 9). The right stomach is larger than the left and 

 may be divided into an anterior and a posterior portion. Tlie 

 former has a nipple-like diverticulum on the lower side ; the latter 

 expands into a spaceous chamber behind the opening of the in- 

 testine (fig. 8). The intestine is short and arises from the 

 lower anterior part of the posterior portion of the right 

 stomach ; it bends inward to join the sliort rectum at the lower 

 side of the posterior end of this (fig. 10). A row of large 

 glandular cells is found along the posterior and lower side 

 of the left stomach (fig. 10) ; three or four more cells lie 

 on the bottom of the right stomach diverticulum [br., fig. 8). 



The ovary or the testis, when fully developed, is hemi- 

 spherical ; both are always hollow in the central parts. Neither 

 gland extends over the lateral surface of the alimentary canal, 

 only covering to a small extent the posterior portion of the 

 right stomach (fig. 8). 



The tail and its musculature are both slender. Two subchordal 

 cells, separated from each other, lie to the right of the chorda. 

 The ratio of the length to the greatest breadth of tail is 6 : 1 ; that 

 of the greatest breadth of tail to the width of musculature, o.l : 1. 



The length of trunk in the largest specimen reaches 1111 //, 

 and that of tail in same, 3888 jx. 



