NOMENCLATURE. 29 



species of the Genus Anomia adhere to fo- 

 reign substances. 



liABiA. 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 j opposed to prominent. 



truncata. Truncate ; shorter than the suture. 



externa. External ; the margins of the area, or 

 anterior slope about the ligament. 



incumlentia. Incumbent ; when one of the ex- 

 ternal lips hangs over the other. 



LiGAMENTUM. LiGAMENT J a cartilage which 

 closes the suture, and is affixed betweeii 

 the internal and external lips of the shell, 

 connecting the valves. 



LiMBUs. LiMBUs J circumference within the 

 margin, 



LoNGiTUDo. Length, measuring from the summit 

 to the opposite margin ; and the breadth, 

 Latitudo, in a direction at right angles 

 to this. 



