14 TERMS UNIVALVES. 



" The vertex in Patella is as the superincum- 

 bent part of the shell. 



" The epidermis is the outward skin that 

 covers the surface of some shells. 



" Fauces are narrow entrances, as at each end 

 of the cowry. 



*' Tubercles are protuberances, or knobs, on 

 the surfaces of shells. 



^^StricE are raised or flat lines upon the surfaces 

 of shells. When the surface is marked with lines 

 longitudinally and transversely, it is decussated. 



" Sulci are furrows. 



" Fornicated signifies arched, greatly exca- 

 vated. 



" Umbo is the swelling part near the beak of 

 bivalve shells ; the same as boss. 



" Longitudinal, running nearly the whole 

 length of the shell in univalves. 



" Concenii'ic, having the same centre. 



" Convolute, when the exterior whorls spirally 

 invole the interior. 



" Varices, longitudinal, gibbous sutures formed 

 in the shell, at certain distances on the whorls. 



" Carinatedj having the form of the keel of a 

 boat.'' 



