Fig. 13. Distal genitalia of Natalina s.s. (all NMSA): (A) N. cafra natalensis subsp. n. (1392), lower male tract with penis and epiphallus cut open to show internal structure; (B) N. cafra cafra (W4220), external view of epiphallus showing bulla at base of epiphallus, close to its junction with vas deferens; (C) N. quekettiana quekettiana (W6646), epiphallus opened longitudinally to show internal ridges and intervening diverticulae; (D) N. c. natalensis subsp. n. (1392), lower female tract showing oviduct caecum (caecum dissected away from free oviduct and spermoviduct base to which it is fused with connective tissue in life) and vagina which has been opened longitudinally to reveal internal folds. Abbreviations: bd – bursa copulatrix duct, ct – connective tissue web, d – slit-like diverticulae in epiphallus wall, eb – epiphallus bulla, ep – epiphallus, er – internal epiphallic ridge, fod – free oviduct, ga – genital atrium, obd – opening of bursa copulatrix duct, oc – oviduct caecum, p – penis, pl – penis lumen with micropapillate lining, pp – penis papilla, pr – penial retractor muscle, sod – spermoviduct, v – vagina, vd – vas deferens.