EXPLANATION OF PLATE XX. 



Fig. 34. Amphithalamus i)iclusus. Carpenter. 



Figs. 35, 36. Cotiiis superstes, Hedley, and separate proto- 



conch. 

 P'§^- 37- Mitra stuclialis, Hedle)'. 



,, 3<S. Rifigicuhi meridionalis, Hedley. 

 Figs. 39, 40. Ritii^icnla seniisculpfa, Hedley. Lateral and 

 frontal aspects. 

 41, 42. (\niipages jafjiPnsis, Blochmann. Different 

 aspects of the brachial apparatus. 



