486 



COMPARATIVE ANATOMY 



CHAP. 



Iii the Diplopoda and Pauropoihi the two genital apertures lie behind 

 the 2d pair of legs, generally at the boundary between the 2d and 3d 

 trunk segments. 



In the Syinphyla (Scolopendrella) the unpaired genital aperture lies 

 on the -4th trunk segment between the le^s of this segment. 



Fn;. 34t'.. .1, Female. ]'>, Male sexual 

 organs of Glomeris marginata (after 

 Fabre). os, Opened ovarial sac, in which 

 Hie two ovaries (uv) are seen; od, oviduct; 

 /, trstes; tji-rf, common vas deferens; pa, 

 paired ducts. 



Fie. ?,\->. Inner male sexual organs. A. Of Molophagus ovinus. J:, Of Acheta campestris. 

 C. Of Melolontha vulgaris (after Carus and Gegenbaur). /, Testes ; rd, vas deferens ; o 1 , si-niiiial 

 vesicle; <l<', duct us ejaculatorius ; ;//, accessory Clauds. 



Iii iill J/t'.i'djiu(ht the genital apei'tui-es lie at the end of the abdomen, 

 in the male almost always behind the Oth, in the female behind the 8th 

 (in the Kphemeridw 7th) abdominal segment. 



Accessory organs are almost always found connected with the 

 ducts of the male and female sexual apparatus of all Antcnnata ; the 



