406 T. H. MOKGAN. 



Seminal receptacles in the 8th and 9th metameres. In 

 another worm similarly modified the ovaries were also present 

 in the 12th metamere. 



No. 5. Openings of the vasa deferentia on the 16th meta- 

 mere. The ovaries were present in the 14th metamere. 



We may next examine those cases where the openings of 

 the vasa deferentia are, right and left, on consecutive meta- 

 meres. 



No. 6. Three worms were dissected in which the right vas 

 deferens opened on the 15th metamere, and the left on the 

 16th, figs. 56 and 57 (projections from above). In two of the 

 three worms the ovaries showed a similar variation, appearing 

 on the 13th (right) and 14th (left) metameres, — that is, each 

 two segments in front of its corresponding vas deferens. In 

 the third worm both ovaries appeared in the same metamere, 

 viz. the 13th. 



No. 7. Two cases recorded with the left vas deferens 

 opening on the 15th metamere, and the right on the 16th. 

 The ovaries varied correspondingly, and were found in the 13th 

 (left) and the 14th (right) metameres (see fig. 58). The seminal 

 receptacles showed a similar displacement, and were found in 

 the 9th and 10th (left) and 10th and 11th (right) metameres. 



No. 8. The worm drawn in fig. 52 in which the left vas 

 deferens is doubled (14th and 15th metameres) was dissected, 

 and a corresponding doubling of the ovaries of the same side 

 was found. 



No. 9. In another case of doubling the vasa deferentia of 

 the right side opened on the 16th and 17th metameres; that 

 of the left side was single and appeared on the 16th metamere 

 (fig. 59). The ovaries varied also, appearing in the 13th and 

 14th metameres of the right side, and in the 14th of the left 

 side. The variation here is not the same in the ovaries and 

 vasa deferentia on the right side, for if the ovaries had 

 varied to correspond they would have appeared in the 14th 

 and 15th metameres of the right side. 



No. 10. The paired openings of the vasa deferentia are 

 found on the 15th metamere. In addition there is another 



