EARTHWORM PHERETIMA HUPEIENSIS — GRANT 



57 



(fig, 3). This pore opens on a raised circular papilla in the ventral 

 midline of segment 14 just posterior to intersegmental furrow 13/14 

 (fig. 4,a). 



The clitellum consists of a smooth, slightly swollen girdle in seg- 

 ments 14 to 16 that passes uniformly around the body. The position 

 of this structm'e is constant. 



In P. hwpeiensis the typical arrangement of the spermathecae is as 

 follows: The first pair is located in segment 7, while segment 8 con- 

 tains the posterior two pairs (fig. 3). Each spermatheca is composed 

 of a long, oblate ampulla, which is not clearly differentiated from its 



y.n. 



p.gl. 



o.f o. s.y. 



oc.gl. 



Figure 3. — Diagram of the reproductive system of Pheretima hufeiensis. For explanation 

 of abbreviations see page 54. 



duct. From the base of the duct a long diverticulum extends for 

 about twice the length of the ampulla, terminating in a small, spherical 

 chamber. Below the chamber, the lumen of the diverticulum is 

 highly convoluted for about half its length before it straightens into 

 a tube leading directly to the duct of the ampulla (fig. 4,6). The 

 spermathecae described by Chen (1933) as spatulate and highly 

 wrinkled were obviously in a collapsed condition. 



Although many animals show the typical arrangement described 

 above, it is quite common to find individuals with an entire sperma- 

 theca transferred to an adjacent segment. However, no more nor 

 less than three pairs of spermathecae have been described in a single 



