XXVI 



INTRODUCTION. 



Fig. ii. 



A. Sakiella honesta, enlarged. Dorsal side, viewed from above, to show 



position of the pericardium (p\ heart with auricle (a^) and ventricle (vh), 

 kidney (&), pulmonary cavity (pc), liver (I), anus (), mantle-edge (m). 

 A'. Dorsal side, seen from below. Eectum (rec), kidney -opening (ko], 

 pulmonary vein (pv), right shell-lobe (rsl), left shell-lobe (Isl). 



B. Microcystis ambce, showing embryonic shells within the oviduct, x 9. 



B'. An embryonic shell, showing development of the foot, with eye and 

 anal and respiratory orifices. X 44. 



C. Shell of Sitala attegia. Diagram to illustrate the different parts and 



usual measurements. 



D. A spermatophore of Sesara infrendens, much enlarged. After Stoliczka. 



Parts of the shell and usual measurements. 



1-7. The apical whorl to the 7th 

 (the last or body-whorl). 



5. The antepenultimate whorl. 



6. The penultimate whorl. 



8. The apex. 



9. The umbilical region. 

 8-9. The axis. 8-14. Spire. 



10. The aperture : the upper, 

 outer, and inner angles of, 

 the interval between being 

 the wall of the aperture. 



11. The peristome and outer 



lip. 



12. The columellar margin. 



13. The suture. 



14. The periphery or keel. 

 A B. Major diameter. 

 A-C. Height of shell. 

 A-D. Do. of axis. 



E-R Do. of aperture. 

 G-H. Breadth of aperture. 



