MTR1A.PODA. 



517 



of the limbs, sometimes in the 

 connecting membranes be- 

 tween the sterna and terga) ; 

 and they give off bunches of 

 tracheae, which branch and are 

 distributed to all the organs. 



Generative organs. The 

 Myriapoda are dioecious. The 

 ovaries and testes usually have 

 the form of long unpaired 

 tubes, while their ducts are 

 often paired and are always 

 connected with accessory 

 glands, and in the female are 

 sometimes provided with a 

 double receptaculum seminis 

 (fig. 421). The genital open- 

 ings lie on either side on the 

 coxal joints of the second pair 

 of legs, or behind this pair of 

 appendages (Chilognatha), or, 

 as in the Chilopoda, there is 

 an unpaired genital opening 

 at the posterior end of the 

 body (fig. 422). 



In the male sex amongst 

 the Chilognatha there are 

 often external copulatory or- 

 gans* on the 7th segment, 

 remote from the genital open- 

 ings. These become full of 

 sperm before copulation, and 

 during the coitus introduce it 

 into the female genital open- 

 ing. 



Development. The fe- 

 males are usually larger 

 than the males, and lay 



* Besides Fabre l.c., compare 

 Voges, "Beiti-a^e zur Kenntniss 

 der Julidcn," Zeittchr. fiir n'iss. 

 Zool., Tom XXXI., 1878. 



FIG. 421. Generative organs of Glomeris 

 maryinata (after Fabre). T, Testis; Ov, 

 ovaries; Od t Oviduct. 



FIG. 422. Generative organs of Scolopendra com* 

 planata (after Fabre). T, Testis ; Vd, vas 

 deferens ; Dr t accessory glands ; Sb, loop of 

 the vesicula seminalis ; Ov, ovary. 



