PLATE XXIX. 



FIGS. 



1-4. Eugyra arenosa A. & H. (p. 70) 1. Mantle. 2. 

 Mantle partly laid open, exposing external surface 

 of branchial sac. 3. Mantle fully laid open, and 

 outer layer of branchial sac removed, exposing the 

 interior. 4. Branchial sac removed, exposing diges- 

 tive organs, etc. 



5-7. Eugyra globosa Hanc. (p. 73) 5. Test. 6 and 7. 

 Views of mantle (6, right side; 7, left side). 



All the figures about twice natural size. 



