18 ATIT. 5.— T. ATD A. 



lower margin a row of gigantic glandular cells. The connect- 

 ing portion between the right and the left stomach is spaceous and 

 forms a distinct part of the stomach ; it has three or four gland- 

 ular cells at the bottom {cps., figs. 2 and 5, PI. IV.). The 

 right stomach is large and may be divided into two portions, an 

 anterior and a posterior. The anterior portion has a small round- 

 ish blind-sac on tlie lower side {br., lig. 2). The posterior 

 portion is not so spaceous as the anterior ; the short intestine 

 begins from its lower portion and runs directly inward to open 

 into the round rectum, which stands vertically to the body-wall. 



The Atlantic form of this species is said to have two median 

 ovaries, but the majority of our form has a single ovary (fig. 4). 

 Only one specimen out of the six I have had showed two 

 ovaries. In advanced stages, the single ovary develops to a 

 thick mass, wedging in between the two lateral testes (fig. 5). 

 The testes are thick ; the right one extends a little over the 

 posterior portion of the right stomach (figs. 2 and 5), while 

 the left one never extends over tlie lateral surface of tlie 

 alimentary canal. This characteristic feature of the testes may 

 be observed even in the very early stage of their development 

 (fig. 4). 



The tail is broad with a narrow muscular coating. It has 

 one subchordal cell on the right side of the chorda. 



The ratio of the length of tail to its greatest breadth is 

 5.8 : 1 ; that of the greatest breadtli of tail to the width of mus- 

 culature, 2:1. 



The length of trunk in the largest specimen measures 12öO/-< 

 and that of tail 6875 /i. 



Beautifully colored specimens apparently belonging to this 



