12 



PEOCEEDINGS OF THE N'ATIOITAL MUSEUM 



1 



Figure 4 



1. Pseudocardinal teeth. 



2. Anterior retractor muscle scar. 



3. Anterior adductor muscle scar. 



4. Protractor pedis muscle scar. 



5. Pailial line muscles scar. 



6. Lateral hinge tooth. 



7. Posterior retractor muscle scar . 



8. Posterior adductor muscle scar. 



Figure 5 



1. Cross section of shell. 



1. Left mantle lobe. 



2. Labial palps. 



3. Foot. 



4. Outer gill. 



Beak sculpture, enlarged. 

 Figure 6 



2-3. Glochidia, enlarged. 

 Figure 7 



5. Marsupium. 



6. Inner gill. 



7. Right mantle lobe. 



Figure 8 



1. Anterior retractor muscle. 



2. Anterior adductor muscle. 



3. Protractor pedis muscle. 



4. Posterior retractor muscle. 



1. Mouth. 



2. Stomach. 



3. Intestines. 



4. Typhlosole. 



5. Rectum. 



6. Anus. 



7. Hepato-pancreas. 



8. Gonads. 



5. Posterior adductor muscle. 



6. Pailial line muscles. 



7. Dorsal mantle muscles. 



Figure 9 



9. Renal aperture. 



10. Reno-pericardial aperture. 



11. Ventricle. 



12. Left auricle. 



13. Urinary bladder. 



14. Kidney. 



15. Pericardium. 



Figure 10 



1. Cerebral ganglia. 



2. Anterior adductor muscle nerves. 



3. Cerebral commissure. 



4. Anterior mantle nerves. 



5. Pedal commissure. 



6. Pedal ganglion. 



7. Anterior visceral nerves. 



8. Anterior visceral nerves. 



9. Visceral nerves. 



10. Posterior visceral nerves. 



11. Posterior visceral nerves. 



12. Posterior commissure. 



13. Posterior ganglion. 



14. Posterior mantle nerves. 



15. Gill nerves. 



16. Exhalent siphon nerves. 



17. Inhalent siphon nerves. 



18. Ventricle. 



19. Left auricle. 



20. Anterior aorta. 



21. Anterior adductor muscle artery. 



22. Pedal artery. 



23. Visceral artery. 



24. Posterior aorta. 



25. Posterior mantle artery. 



26. Posterior adductor muscle arterj'. 



27. Anterior mantle artery. 



Plate 1 

 Plate 2 

 Plate 3 



Lampsilis ochraceus Sa}'. 



Lampsilis nasutus Say. 



Anodonta cataracia Say. 



Pl.\te 4 



Elliptio complanatus (Solander) Dillwyn. 



Plate 5 

 Elliptio productus Conrad. 



o 



