134 F. n. STEWAliT. 



of a layer of flattened epithelial cells. At the fundus this 

 layer becomes continuous with the germinal syncytium ; in 

 other wordSj the germinal syncytium is a specialised portion 

 of the epithelium lining the gonocool. 



The germinal syncytium and the ova developing from it 

 extend from the fundus down the tube as an unbroken 

 column^ completely filling the lumen, and this mass is, of 

 course, the true ovary. In the germinal syncytium numerous 

 nuclei occui', imbedded rather irregularly in the relatively 

 scanty protoplasm. As we pass down the tube the nuclei 

 begin to arrange themselves in a single layer at the periphery 

 of the column ; the central, non-nucleated protoplasm is the 

 rhachis. Next, cell outlines appear around the nuclei, and 

 the rhachis becomes smaller with the increasing size of the 

 developing ova. Finally the rhachis ceases, the ova are 

 arranged in successive tiers, closely packed against each other 

 (PI. 8, fig. 26 a, ov.) The protoplasm of the ova at this point 

 consists of a meshwork. Before the ova becomes separated 

 from this continuous column and pass into the oviduct 

 eosinophil granules (yolk) make their appeai'ance. 



The division of the remaining portion of the genital tract 

 into regions is necessarily somewhat arbitrary. Each region 

 shades off into the one preceding and the one following it, 

 and in different individuals the appearances at the same 

 level vary. The same portion morphologically may be empty 

 and constricted, or distended with ova or spermatozoa. In 

 the following description I have divided it, according to the 

 characters of the wall, into oviduct, receptaculum seminis, 

 and uterus; the vagina is the single terminal portion. 



The oviduct and receptaculum (text-fig. 5, k.s.) follow the 

 ovarian region. They extend from about (he middle of the body 

 backward to the end of the sixth to tenth, then turn forward 

 again for a short distance, and become continuous with the 

 uterus. Their course is slightly tortuous, only slightly when 

 compared with the ovarian region. The appearance of the 

 tube varies with the contents; at its commencement it con- 

 tains at most a few single ova and spermatozoa, and here it 



