128 F. H. STEWART. 



pointed end directed towards the caecum. The base is concave, 

 and receives into its concavity one end of the first uterine 

 ovum. The gland is attached to the right wall of the uterus, 

 except at the base ; here it projects freely into the lumen. 



The gland is interesting histologically. It is formed of 

 protoplasm continuous with the wall of the uterus. Cell out- 

 lines are not present. At the apex the nuclei are large and 

 spherical, have a very prominent pseudo-nucleolus and a 

 nuclear membrane ; at the base, however, the nuclear mem- 

 brane has disappeared, and the nuclear sub.stance is diffused 

 into the protoplasm. Contiguous nuclei thus become con- 

 tinuous, and, as the nuclei are arranged at the periphery of 

 the mass, a basophil circle, in transverse sections, results. In 

 this basophil circle the pseudo-nucleoli stand out, and might 

 easily be mistaken for the nuclei themselves. 



The wall of the uterus (PI. 8, fig. 20, id.) for the greater 

 part of its length is composed of a cubical epithelium. This 

 is, of course, considerably flattened where the uterus is dis- 

 tended by the ova. Near the junction with the ovarian ctccum 

 the outlines of the cells become indistinct. When, as some- 

 times happens, there is no ovum in contact with the base of 

 the shell-gland, the wall is here thick and the epithelium has 

 a glandular appearance. 



The ova in the uterus (ib., ov.) are oval in shape and measure 

 •27 mm. in length. The protoplasm is obscui'ed by the mass 

 of yolk-granules. A single nucleus occurs in each ovum, and 

 this is invariably undergoing karyokinetic division, presum- 

 ably in prepai-ation for the extrusion of the polar body, although 

 I have not observed this body. The shell is '001 mm. thick 

 and is sculptured, riarrow ridges running over its outer sur- 

 face. 



Spermatozoa do not occur in the uterus. 



The vagina (PI. 8, figs. 22, 23, 24, rag.) is a glandular and 

 muscular tube "595 mm. in length. The glands surrounding 

 it {vgc), with those which lie around the vulva, give it a riclily 

 cellular appearance in preparations of the entire animal. At 

 its origin from the uterus it is tightly constricted, but it soon 



