688 



MR. B. F. CUMMINGS ON LICE 



tliem to be local cliitinisntions one on each side of a memliranons 

 tube — tlie outer tube. In text-fig. 32 a section is shown of this 

 outer tube contained within the genital chnmber, and the basal 

 plate and paranieres are seen merely as local thickening in the 

 continuous wall of the sac. 



Text-figure 32. 



GC 



GC 



Lipenrns forfictdatus, $ . Transverse section througli the genital chamber, 

 with the copulatorj apparatus retracted. (Diagrammatic.) 



It., rectum. M. muscles. FL. chitinous strip on ventral surface of the sac. 

 JBP. basal plate between the base of the parameres (P.). G-C. genital chamber. 



Text-fif>ure 33. 



Lipeitrusforjicnlatus, S ■ Longitudinal section through the end of the abdomen. 



(Diagram.) 



JB. rectum. GC. genital cavity. S. sac. P. paramere. PP. basal plate. 



Now, if reference be again made to the diagram (text-fig. 33) 

 it is evident that the dorsal sector of the genital chamber ends 

 much sooner than the ventral. Reading the sections forwards 



