220 Transactions of the Royal Society of South Africa. 



FIG. 



4. Anterior end of sj:)ermatozoon ; X 1000. 



5. Reproductive organs ; X 6. 



6. Retracted animal without its shell ; X 5. 



7. Living animal ; X 2^. 



EXPLANATION OF PLATE VIII. 



Ledoulxia mozambicensis (Pfeiffer), Lebombo Mountains. 



1. Retracted animal without its shell, showing distribution of pigmeiit on mantle, etc. ; 



X4. 



2. Hind end of foot of an abnormal specimen, seen from above, showing the forked 



caudal lobe ; X 4. 



3. Reproductive organs ; X 5. 



4. Central nervous system ; X 10. 



Conulinus junodi (Conn.), Lebombo Mountains. 



5. Anterior part of immature male genital organs, showing the penis in the centre, 



the epiphallus on the right, and the jjenial apjiendix on the left, with the penial 

 retractor and flagellum below ; Xl6. 



6. Central nervous system ; X 12. 



7. Animal without its shell, showing part of foot, kidney, stomach, liver, etc. ; X 4. 



Isidora {Physojisis) globosa (Morelet), Lorenzo Marques. 



S. Pulmonary orifice, with the folded branchial lobe, anus, etc., on the right of it ; X 5. 

 9. Central nervous system; X 14. 



10. Anterior end of spermatozoon ; X 1200. 



11. Posterior end of penis with its sheath split open, showing the junction of the vas 



deferens with the penis ; X 11. 



12. Alimentary canal and salivary glands, seen from above ; X6. 



13. Animal without its shell, seen from the left side ; X3. 



14. Reproductive organs ; X 5. 



15. Posterior end of penis, showing penis-pajjilla — this sjjecimen exhibiting a different 



condition from that seen in fig. 11 ; X 12. 



Planorbis (Planorbula) 2ifei_ff'eri (Krauss), Lorenzo Marques. 



1(3. Anterior end of spermatozoon ; X 1200. 



17. Lobes beneath the pulmonary orifice, seen from above ; x8. 



18. Reproductive organs ; x8. 



19. Buccal mass, salivary glands, oesophagus, stomach, caecum, and first loop of 



intestine ; X 6. 



