132 F. H. STEWART. 



ovum wli it'll occupies the fundus has a nucleus of the same 

 chai'acter, but still larger, 0"0172 mm. 



Comparing this with the adult, it is obvious that the pro- 

 jection of germinal epithelium corresponds with the com- 

 mencement of the ovary, and the fundus of the tube with the 

 ovarian cascum. In development to maturity the germinal 

 syncytium and the oogonial mass grow in the direction of the 

 external aperture, evaginating the epithelial wall, and forming 

 the reflected portion of the t^dult gonads. 



Of the remaining four fifths of the tube, three fifths consist 

 of a solid protoplasmic rod, with nuclei arranged around 

 the periphery. In the last fifth the epithelium becomes 

 columnar (Fl. 8, fig. 25). The cuticle of the body-wall passes 

 into the lumen of the gonads as a solid core, but extends 

 only a very short distance beyond the union of the two tubes. 

 Gonenteric canals do not occur. 



The last quarter of each tube and the united portion are 

 surrounded by gland-cells {vgc.) lying in the body space. 

 Processes pass in the direction of the vulva, but I have not 

 been able to detect any openings through the cuticle. 



ascaeis clavata (rud.). 

 Female Eeproductive Okgans. 



The female reproductive organs of A. clavata occupy one 

 half of the length of the body. If the body is divided into 

 ten parts, they extend from the end of the third to the end of 

 the eighth part. The external aperture lies at the end of the 

 third part. 



They conform to the general Nematode type, consisting 

 of two germinal masses lying at the fundi of two tubes, the 

 two tubes uniting before reaching the external aperture. 



Physiologically each tube may be divided into two regions — 

 viz. one in wliich the ova develop from the geiminal syn- 

 cytium, and undergo maturation, the other strictly a passage 



