PLATE LXII. 



Lampsilis recta, female, with shell structures indicated. 



Figure 1. 



AAC Anterior adductor cicatrix or scar, 



AC Anterior pseudocardinal. 



ARC Anterior retractor cicatrix. 



B Branchial depression. 



IN Interdentum. 



L Ligament. 



LT Lateral teeth or laterals. 



LU Lunule. 



P PaUial line. 



PAC Posterior adductor cicatrix. 



PC Posterior pseudocardinal. 



PRC Posterior retractor cicatrix. 



U Umbone or beak. 



Figure 2. 



A Anterior margin. 



AS Anterior slope. 



B Beak or umbone. 



DM Dorsal margin. 



L Ligament. 



LF Lateral furrow. 



LS Lateral slope. 



LU Lunule. 



PM Posterior margin. 



PS Posterior slope. 



PU Posterior umboidal ridge. 



V Ventral margin. 



