626 SAMPSON. 



EXPLANATION OF PLATE XXXII. 



The figures of sections are drawn from preparations of C. olivaceus. 



Fig. 4. Cross-section through the anterior group of pedal muscles on one 

 side under VI. Interior mantle muscle (ivi) is cut immediately posterior to the 

 region where a break occurs for blood supply to the mantle. Camera drawing, 

 X 28. 



Fig. 5. Cross-section through the posterior group of pedal muscles on one 

 side under VI. Interior mantle muscle (m) is cut immediately anterior to the 

 region where the main blood supply passes to the mantle. Camera drawing, X 28. 



Fig. 6. Sagittal section through the attachments of the latero-pedal muscles 

 of the anterior and posterior groups under shell V; showing also the posterior 

 group under IV and the anterior group under VI. Camera drawing, X 28. 



Fig. 7. Cross-section through one side of the posterior region under I. 

 Camera drawing, X 28. 



