The Non-Marine Mollusca of Portuguese East Africa. 219 



Helicarion (Gymnarion) ni/asanus Smith, Macequece. 



4. Posterior part of the animal, .seen from the right side after the removal of the 



shell ; X 3. 



5. Dorsal view of left pallial lobes. 



6. Dorsal view of posterior portion of foot. 



7. Dorsal view of reproductive system (slightly immature), free retractor muscles, 



anterior portion of digestive system, and cerebral ganglia ; x 5. The penis is dis- 

 placed towards the right, and the croj), with the salivary glands, towards the left. 



8. Jaw; xl2. 



Subuliniscus chiradztduensis (Smith), Macequece. 



9. Embryo from uterus, with the mantle-margin and the foot projecting from the 



aperture of the shell ; X 9. 



10. External view of kidney, ureter, and heart of embryo ; x 12. 



11. Jaw (of adult) ; x24. 



12. Anterior end of spermatozoon ; x 1200. 



13. Dorsal view of hind end of foot. 



14. Dorsal view of alimentary canal with salivary glands ; Xo. 



15. Dorsal view of free retractor muscles and reproductive system ; x5. 



16. Central nervous system. 



EXPLANATION OF PLATE VI. 



Pseudoglessula {P.seudocerastus) boivini (Morelet), Kosi Bay, Zululand. 



1. Pallial organs seen from within, showing the roof of the lung, with the mantle-edge 



and left body-lobes above, the heart and kidney below, and the rectum on the 

 left side ; X 3. 



2. Transverse section through j^edal gland slightly in front of the middle of its length ; 



Xll. 



3. Jaw ; X 13. 



4. Free retractor muscles, and genital ducts (slightly immature), with buccal mass, 



oesoj^hagus, salivary glands, and cerebral ganglia ; X 5. 



Tropidophora (Ligatella) insularis (?) (Pfr. ), Macequece. 



5. Dorsal view of alimentary canal, showing the buccal mass with the recurved radula- 



sac and convoluted salivary glands above, and the stomach below ; x 4^. 



6. Male genital duct, showing the large penis above, and the prostatic gland in the 



middle ; X 4 J. 



7. External view of pallial organs, showing the pulmonary veins, with the heart and 



kidney below ; x 5. 



8. Living animal seen from the right side ; X 3. 



9. Living animal seen from below ; x 3. 



EXPLANATION OF PLATE VII. 



Pseudogtessula [Pseudocerastus) cressyi Conn., Macequece. 



1. Representative teeth from the radula ; X400. 



2. Dorsal view of hind end of foot. 



3. Nerve-ring ; X 12. 



