442 
Fig. 
xFig. 
ON THE GASTROPODS CHYTRA AND LIMNOTROCHUS. 
Puare 39. 
12. Chytra Kirkit. Mantle-cavity, with mantle reflected to the right 
side. x 10. 
Is! A Fy Dissection of the alimentary canal. x 10. 
A or ae se Nervous system, dorsal aspect. x 10. 
ib). in = 7 lateral aspect. > 10. 
16. % * Otolith. Highly magnified. 
17. 3 By Gill-leaves, isolated. Highly magnified. 
18. s yi The shell, lateral aspect. 
19. 3 Fs i from beneath. Both slightly enlarged. 
20. a : Radula, 2 laterals, admedian and median,teeth ; from 
a drawing by Mr. J. E. S. Moore. Magnified. 
21. 8 BA Operculum, external face. x 6. 
Prats 40. 
22. Aporrhais pes-pelecani. General dissection. 2. 
23. 4 Ps Nervous system from, \the} dorsal aspect. 
x about 23. 
24. Limnotrochus Thomsoni. Dissection of the stomach. x 10. 
25. Chytra Kirkii. Thesame. xX about 10. 
26. Nassopsis nassa. Dissection of the stomach. x 10. 
27. Trochus turbinatus. The same, after Robert (7). x 10. 
28. Pleurotomaria Beryrichti, The same. From a drawing by the late 
Mr. F. Woodward. x10. 
* The figures marked thus are from drawings by Mr. J. E. 8. Moore. 
