2G TROCEEDINGS OF THE MALACOLOGIC.U: SOCIETY. 



Fig. 6. — Dissection of the alimentary canal and nervous system, the relative position 

 oi the cryst;illiue-style sac on the loft side of the body is dotted in. x 3. 

 7. — Section through the fused pedal ganglia, showing the 2 sessile otocysts 

 (statocysts). x 60. 



,, 8-16. — Transverse section through different regions of the body. All magnified 

 18 diameters. 

 8. — Through the mouth. 

 9. — Througli tlie brain. 

 10. — Through the posterior part of the stomach, showing the crystalline-style 



sac on the left hand side and the origin of the intestine on the right, 

 11 . — Through the posterior region of the body of a larger specimen. 

 12.— Through the heart. 

 13. — Through the visceral ganglia and kidneys. 

 14. — Through the posterior adductor muscle. 

 15. — Tlirout^h the anus. 

 16. — Through the anal siphon. 

 17. — Two of the gill filaments in section, x 90. 



18. — A vertical section of the dried shell passing through two spines. Also a 

 tranverse section of one spine to show the absence of the prismatic 

 layer. 



