238 ^- A-. and W. G. MacCallum, 



The Channel which is g-iven oif turns forward and becomes wider. 

 It runs a short way forward and to one side. At first it was re- 

 garded as another yolk duct, but it is unpaired and much thicker 

 walled than the others. It comes to an end anteriorly but in our 

 material, it is not possible to be siire that it ends blindly. It is 

 filled with cells from the yolk gland and anteriorly it comes to be 

 surrounded by lobules of the vitellarium and sacculations of the 

 extremely indefinitely outlined intestine as it itself fades away. It 

 seems possible that this may be the canalis genito-intestinalis which 

 has been described by so many authors and which, as Odhner states, 

 occurs in all the MicrocoUßidae; but the connection at one end at least 

 is so indefinite and the conception of the intestino-genital canal so 

 startling- that we hesitate to ascribe to it this significance. 



The Uterus begins as a club shaped structure densely surrounded 

 by elougated cells which are radially arranged and possibly function 

 as a Shell gland. It is, in the sections before us, filled with yolk 

 in the form of nucleated cells exactly as is the case with the canal 

 just described. Eeceiving the common canal from the ovary and 

 other glands at its lowermost point it runs in a staight line forward 

 into the anterior part of the body where it spreads out into a long 

 fusiform sac which finally opens by a rather wide canal at the 

 genital pore. 



This sac may contain one or more eggs which are yellow oval, 

 measure 0,22 . 0,12 and are provided anteriorly with a long filament 

 and posteriorly with an anchor shaped hook. 



At a point in the mid dorsal line a short way behind the level 

 of the genital pore, there is an opening which leads into a vagina. 

 This tube is curiously kinked and supplied at that point on one 

 side only with a strong mass of muscle tissue. Behind this it be- 

 comes somewhat saccular and is surrounded by a dense mass of 

 nucleated cells. It suddenly becomes very thin walled and gives off 

 one extremely delicate tube which may be followed back into the 

 inferior of the body. It is so delicate, however, that we have 

 not been able to follow it to its union with the yolk duct, as 

 the case may be, in the Single series of sections at our disposal. 

 It seems eutirely probably, however, that such a union does occur 

 although a great distance must be traversed by this exceedingly 

 delicate tube. 



On the whole, then, the study of the feraale genitalia of this 

 form is rather incomplete since it has been impossible to make out 



