508 



Dr. L. Cognetti de Martiis on a 



septum x.-xi. Opposite to tliem are found the spindle- 

 shaped dilated chambers ('' Sameninagaziue ") at tlie be- 

 ginning of the sperm-ducts. 



A pair of sperm-sacs depends from the posterior surface of 

 septum xi.-xii. 



These organs extend slightly into the xii. segment, 

 ^vhere their surface appears a little furrowed ; the expanded 

 portion is provided posteriorly Avith a tubular appendix. 

 The tubular appendix of the sperm-sac of the left side is 



Fig. A. — Female generative organs and prostates of Pohjtoreutua 



baralj/pton, sp. n. X 4. 

 Fig. B. — The central female generative organs of the left side, more 



magnified. X 6. 



ap^.=globular appendix ; rf«t>. = diTerticulum of the spermatheca ; e.c.= 

 egg-capsule; e.s. = egg-sac ; /?.=ligament ; o.c?. = oviduct ; pr.= 

 prostate; s.(?.=sperm-duct ; 5.^j. = spermathecal pore; $= female 

 pore. 



short and closed in the xii. segment, but that of the right side 

 is longer and reaches the xviii. segment, being ribbon- 

 like and a little dilated at the extremity. This inequality in 

 the length of the sperm-sacs has also been found by Beddard * 



* .See Proc, Zool. Soc. 1007,. pp. 417 et seq. 



