NOMENCI-ATURE. 29 



species of the Genus Anomia adhere to 

 foreign substances. 



Labia. Lips. 



interna. Internal ; the small lips within the liga- 

 ment, which are united by it. 



hiantia. Gaping : when the lips are wide, or dis- 

 tant from each other. 



retracta. Retracted ; opposed to prominent. 



truncata. Truncate; shorter than the suture. 



externa. External ; the margins of the area, or 

 anterior slope about the ligament. 



incumbentia. Incumbent ; when one of the ex- 

 ternal lips hangs over the other. 



LiGAMENTUM. LiGAMENT; a Cartilage which 

 closes the suture, and is affixed between 

 the internal and external lips of the shell, 

 connecting the valves. 



LiMBUS. LiMBUs; circumference within the 

 margin. 



LoNGiTUDO. Length, measurins; from the 

 summit to the opposite margin; and the 

 breadth, Lotitudo, in a direction at right 

 angles to this. 



