106 



8. HATAI. 



4. Spermati hecx. — One' pair in segment X, spindle-shaped, and situated 

 between the two testes, on either side of the intestine. The single coalesced duct 

 opens to the exterior on the ventral median line, directly behind the interseg- 

 mental line IX/X. The internal surface of the sac is lined with a non-ciliated 

 epithelium, which is followed by a layer of longitudinal and of circular muscle 

 fibres. The external surface is covered with peritoneal cells. Xo spermatophores 

 could be observed in the spermathecœ. 



.1. Oviduct. — In V. pilosvs the oviduct is stated to be rudimentary, being 

 represented by a pair of depressions of the 12th septum. In the present species 

 no trace of the oviducts could be observed either in transverse or longitudinal 

 sections. 



6. Ovisac {lici-eplaculuin ovarian). 

 — One pair in segment XIII, being 

 formed by the backward bulging out, 

 on the left dorsal side, of the anterior 

 septum, and extending sometimes into 

 the 15th segment but sometimes step- 

 ping short in segment XIV. The 

 mouth of the sac is very large and 

 opens, as a matter of course, into the 

 cœlom of segment XII. The anterior 

 part tf the ovisac encloses, as already 

 stated, the hinder end of the sperm- 

 sac, but the posterior part is slender. 

 The ripe ova are found not only in the 

 ovisac but also floating in the cœlom 

 of this region. (In V. pilosvs the ovi- 

 sac opens into the cœlom of segment 

 XI) 



7. Sierm-duct. — This is very dif- 

 ferent from that of V. pilosis. The 

 funnel is relatively large and bores 

 septum IX/X ; it is continued into a 

 slender duct, which, after running on 

 the inner side of the ovary till about tha 



Cut 3. 



a- Atrium, Pe. Peritoneum, Sep. Septum, 

 Sp.c. Spermiducal chamber. 



