new Species of Vo\y{o\-Q^\\{\xB. 509 



in PoJytoreutus ruioenzorii, Bed 1.^ and P. granti, Bedd. ; but 

 ill tliese two species the right speim-sac is longer than the 

 left. 



The sperm-ducts run backwards against the ventral bodj- 

 wall till tliey reach the prostates near to the male pore 

 (fig. A, s.d., pr.). Tiie prostates are oblong and irregularly 

 moniliform, and they appear of a yellowish colour. They 

 extend from intersegmental furrow xvii.— xviii. to the xxvi. 

 segment, and pass from the ventral to the dorsal region of 

 the body. A distal muscular duct is not distinguishable; 

 a strong bursa propulsoria in relation with the male pore 

 is wanting (lig. A,pr.). 



A pair of nearly globose shortly stalked egg-sacs depends 

 in the ventral region from the posterior surface of the very 

 thin septum xiii.-xiv. (Hgs. A and B, e.s.). The stalk of 

 each egg-sac extends laterally into the rectilinear oviduct 

 {o.d.), and in the opposite direction it passes into a duct, 

 which is a prolongation of the oviduct itself, and which opens 

 out into one of the anterior diverticula of the spermatheca 

 {div) after it has described a short spiral line. This duct is 

 provided, at the extremity which opens into the sperniathecal 

 diverticulum, with a little globular lateral appendix (app.). 

 A small egg-capsule, or "Ovarialblase," is present at the distal 

 extremity of this duct, where the egg-sac opens into it (e.c). 

 Tliis egg-capsule is fastened in the xiii. segment by a short 

 ligament {li.). 



The spermatheca is anteriorly bicornuous, i. e. it is divide 1 

 into two oblong diverticula, which lie in the xiii. segment, 

 and extends dorsally around the oesophagus and calciferous 

 glands (tig. A, div.). 



The unpaired ventral median spermathecal sac underlies 

 the nerve-cord, and is compressed against the body-wall. 

 In the two most anterior thirds it appears more dilated 

 than near the spermathecal pore. Corresponding to septa 

 xv.-xvi. and xvi.-xvii., which are traversed, it shows two 

 constiictions, which form three pairs of rudimentary lateral 

 diverticula tliat lie in segments xv., xvi., and xvii. In the 

 xviii. segment the distal portion of the spermatheca is thin- 

 walled and reaches direct to the external pore {■'^.p.). 

 There is no muscular chamber to this poie. 



Nab. ? Nairobi, British East Africa. 



Polytoreiitas baralypton is well distinguished from other 

 species of the genus by several important characters, viz. : the 

 absence of muscular chambers to the male and spermathecal 

 pores, tiie number and arrangement of the spermathecal 

 diverticula, &c. 



