1908.] 



ASPIDOBRANCH GASTROPOD MOLLUSCS. 885 



Plate XLVI. 

 Fig. 1. Dorsal view of Sepfarla borbonica, $ . The mantle has been cut through 

 and partl3' removed to show the organs of the pallial complex (X o). 



2. A semi-diagrammatic drawing to show the course of the gut in Septaria. 



3. A diagram of the female genital organs of Seplaria. 



Plate XLVII. 

 Fig. 4. A transverse section through the anterior part of the viscera mass of 

 Septaria bougainvillei , showing the connection between the pericardial 

 and gonadial divisions of the coelom aud the oviduco-coBlomic funnel, 

 od.c.f. 

 5. The oviduct and oviduco-ccelomic funnel as shown in the last figure, but 

 magnified 300. This figure is reversed. 



PlATES XLVIII.-L. 



Figs. 6-16. Transverse sections taken at diiferent levels through the genital complex 

 of Septaria bougainvillei, ? . For full description of these figures, see 

 text, pp. 839-841. 



F'g. 17. Septaria boitqainvillei, section through the osphradium and osphradial 

 ganglion. X 300. 



Plate LI. 

 Fig. 18. Portion of a horizontal section through Septaria depressa, showing the 

 uropore {Ur.p.), the opening of the reno-pericardial canal [Rp.c.) into the 

 glandular part of the kidney (K.), the pericardium (pc.co.), &c. 

 19. A section more ventral than that shown in fig. 18, showing the opening of 

 the reno-pericardial canal into the pericardium, and the large extent of 

 the non-glandular part of the kidney. 



Plate LII. 

 Fig. 20. An oblique section through the left or efferent edge of the ctenidium of 

 Septaria bouc/ainvillei. 



21. The more median part of the same section, showing the ciliated junctions 



of the gill-lamella?. 



22. A section through the right or afferent edge of the same ctenidium. 



23. A surface view of a single gill-lamella of Septaria borbonica, showing the 



relative extent of the ciliated and non-ciliated tracts. 



24. The ciliated epithelia of the terminal poitions of the ovipository and vaginal 



ducts of S. bonfiainvillei. Highly magnified. 



25. The ootype epithelivun somewhat further down the duct, showing gland- 



cells containing eosinophilous granules pushing through the basement- 

 membrane into the subjacent connective tissue. 



Plate LIU. 

 Fig. 26. A portion of the ootype gland and ootype epithelium of S. bongainvillei. 

 X about 200. 



27. A portion of the " clear gland " from the genital ducts of S. bougainvillei, 



9 , showing the elongated ciliated epithelial cells lining the lumen of the 

 duct, and the bunches of clear secretory cells the long ducts of which pass 

 between the epithelial cells. Magnified about 750. 



28. A portion of the epithelial lining of the thalamus and the vitelline gland 



of S. bougainvillei, $ , showing the bunches of granular secretory cells 

 and their ducts filled with granules. Magnified about 500. 



Plate LIV. 

 Fig. 29. Left side view of N. (Paranerita) gagates, removed from its sliell.~ X 5. 

 The pericardium has been opened to show the relative positions of heart, 

 ctenidium, rectum, and kidnej'. 



30. The right tentacle and cephalic penis of Neritinafluviatilis. X 10. 



31. The right tentacle and cephalic penis of Nerita melanotraga. X 5. 



32. The right tentacle and cephalic penis of N. (Paranerita) gagates. X 5. 



33. A horizontal section through the cephalic penis of JSf. (Paranerita) 



variegata. 



34. A portion of the opercular gland of Nerita melanotraga, showing the 



gland-cells in different phases of activity and the interstitial or covering 

 cells (int.c). 



