600 



CLASS III. MYRIAPODA. 



absent, or much reduced and functionless (Geophilus}. A 

 pair of receptacula seminis and two pairs of accessory glands are 



in connexion with the hind 

 end of the oviduct. 



The testis is more varied in 

 form. InLithobius (Fig. 360) 

 it is tubular and median, and 

 its duct divides behind em- 

 bracing the gut and receiving 

 two vesiculae seminales ; fur- 

 ther back the two vasa defer- 

 entia unite and receive two 

 pairs of accessory glands. In 

 the Geophilidae there are two 

 tubular testes, and in the 

 Scolopendridae several spindle- 

 shaped testes which open into 

 a median vas deferens ; this 

 divides behind, the duct of 

 one side being reduced, to 

 embrace the gut and pass to 

 the external opening. In these 

 cases the hind end of the vas 

 deferens is coiled and there are 

 two pairs of accessory glands. 



Most Chilopods form sper- 

 matophores, but it is doubtful 

 if copulation occurs. It has 

 been stated that the males 

 deposit spermatophores in 

 places frequented by the 

 females which then in some 

 way take them up. 



Development.* It has been 

 stated that some of the Scolo- 

 pendridae are viviparous. How- 

 ever this may be, the majority 



* Metschnikoff, op. cit. on p. 594. Heymons, op. cit. on p. 314. N. 

 SografT, On the embryonic development of Geophilus (Russian), Nachricht 

 Ges. Freunde Naturk. Anthr. u. Ethn. Moskau., 43, 1883. Korschelt and 

 Heider, op. cit. 



From Shipley & McBride's Zoology. 



FIG. 360. Lithobius fortficatus dissected to 

 show the internal organs (after Vogt and 

 Jung). 1 Antenna ; 2 poison-claw ; 3 

 salivary gland ; 4 walking leg ; 5 ventral 

 nerve cord ; 6 malpighian tubule ; 7 vesi- 

 cula seminalis : 8 small accessory gland ; 

 9 large accessory gland ; 10 testis ending 

 anteriorly in a filament ; 11 alimentary 

 canal. 



