264 VERA KOEHRING. 



From a sagittal view, however, it is very simply explained. During egg-laying 

 the rectum and bladder are pushed anteriorly, the folds of the cloaca smooth out 

 and the anterior pouch is drawn down as the vent is stretched open. It is but 

 another rather larger fold of the cloaca. 



FIG. 4. (Mag. X 175.) Fig. 4 is a transverse section through a 68 mm. 

 female midway through the spermatheca. The mesonephros lies above the 

 spermatheca. In the floor of the spermatheca lie the flask tubules. A few necks 

 are evident. The central tubule is near the dorsal wall. This is an animal killed 

 in June; the tubules are empty and the columnar cells long. Although this animal 

 is short in body length the spermatheca and cloaca show the maturity of several 

 seasons of breeding. 



PLATE II. 



FIG. 5 (mag. X 40), FIG. 6 (mag. X 41?). FIG. 7 (mag. X 42). Figs. 5, 6 and 

 7 are regions of the spermatheca of a 70 mm. female. This organ has not as many 

 tubules as that of the 68 mm. spermatheca of Fig. 4 nor is the cloaca as complex. 

 On the other hand, there are more tubules and more pigment than in the 69 mm. 

 spermatheca of Fig. 3. The significance of these variations after maturity is 

 not known. 



Fig. 5 is a transverse section through the posterior wall of the spermatheca. 

 Fig. 6 is through the region where the necks are converging into the central tubule. 

 Fig. 7 is through the anterior part of the organ; the central tubule bends to open 

 into the cloacal wall and the most anterior flask tubules lie on either side. 



FIG. 8. (Mag. X 50.) Fig. 8 is a transverse section through the anlage of the 

 spermatheca in a 59 mm. female. One pair of flask tubules is shown and the central 

 tubule in which the columnar epithelium has developed. The short, cord-like 

 necks do not show in this section. 



FIG. 9. (Mag. X 86.) Fig. 9 is a frontal section through a 95 mm. female. 

 The necks converge into two groups which join to form the central tubule. One 

 flask tubule is shown with the characteristic ragged-looking but nevertheless very 

 delicate epithelium. The necks are similar to the epithelium of the central tubule. 

 The oviducts and one ureter are in the anterior part of the drawing. 



FIG. 10. (Mag. X 265.) Fig. 10 is the region through the cloaca of the 

 68 mm. individual of Fig. 4 several sections anterior to the opening of the sperma- 

 theca. The central fold pendent from the wall of the cloaca divides the dorsal 

 region, and serves as an egg guide. 



