486 



COMPARATIVE ANATOMY 



CHAP. 



In the Diplopoda and Pmiropoda the two genital apertures lie behind 

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

 trunk segments. 



In the Sijmphyla {Scolopendrella) the unpaired genital aperture lies 

 on the 4th trunk segment between the legs of this segment. 



\L A 



Fig. 346.—^, Female. B, Male sexual 

 organs of Glomeris marginata (after 

 Fabre). os, Opened ovarial sac, in which 

 tlie two ovaries (ov) are seen ; od^ oviduct ; 

 i, testes ; gvd, common vas deferens ; pa, 

 paired ducts. 



Pig. 346.— Inner male sexual organs. A, Of Melophagus ovlnus. B, Of Acheta campestris. 

 C, Of Melolontha vulgaris (after Cams and Gegenbaur). f, Testes ; vd, vas deferens ; vs, seminal 

 vesicle ; de, ductus ejaculatorius ; gl, accessory glands. 



In all Hexapoda the genital apertures lie at the end of the abdomen, 

 in the male almost always behind the 9th, in the female behind the 8th 

 (in the Uphemeridce 7th) abdominal segment. 



Accessory organs are almost always found connected with the 

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



