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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 95 



§^1 e 



A B 



Fig. 4. — Diagrams showing some of tiie principal variations of the genital 

 ducts and accessory structures. 



A, simple condition with gonoducts opening separately through pores of 

 body wall. B, vasa deferentia opening on a pair of penes. C, each vas deferens 

 discharging through an ectodermal ductus ejaculatorius. D, the ejaculatory ducts 

 opening on a pair of penes. E, the ejaculatory ducts opening separately on a 

 single penis. F, a single ejaculatory duct and a single penis. G, the vasa 

 deferentia discharging into a bursa genitalis, or genital chamber (GC). H, the 

 vasa deferentia united distally in a ductus conjunctus (Den). I, the ductus 

 conjunctus enlarged to form a saccus internus (Si), as in many Arachnida. 

 J, a penis evaginated from the genital chamber, traversed by an ectodermal duct 

 from an ejaculatory bulb (Bej), as in Phalangida. K, simple condition in 

 insects, with ejaculatory duct, penis, and genital chamber. L, more complex 

 condition in insects: penis subdivided into phallobase (Phb) and aedeagus (Aed), 

 with ejaculatory duct discharging into an endophallic chamber (Enpli) ; vasa 

 deferentia may be partly replaced by arms of the ejaculatory duct. M, usual 

 structure of genital exit passage of female insects: the common oviduct (Ode) 

 opens into a genital chamber (GC), from which opens the spermatheca (Spt). 



Aed, aedeagus; Dcti, ductus conjunctus; Dcj, ductus ejaculatorius; Enph, 

 endophallus ; G, gonad ; GC, genital chamber, or bursa genitalis ; Gd, gonoduct ; 

 Gpr, gonopore (opening of a genital duct) ; Gtr, gonotreme (opening of the 

 genital chamber); Ode, oviductus communis; Odl, oviductus lateralis; Pen, 

 penis; Phb, phallobase; Phtr, phallotreme (opening of the endophallus); Si, 

 saccus internus ; Spt, spermatheca ; Vd, vas deferens. 



