INTRODUCTION 



For convenient reference a diagram showing the termin- 

 ology of the teeth is repeated here. 



La7nellae 



Supi-acoJuuaellar ...iX-L 



ffi 



1J> -| COLUMELLAR 



I iHfracohimeLlai- ... 



- UPPER PALATAL 

 -; Iroterpalatal 



._, LOWEK PALATAL 



JT r^ 1 ii.fra.pa 1 a ta 1 



*^ BASAL 

 FIG. 1. TEKMINOLOGY OF LAMELLAE AND FOLDS. 



133 

 I 



to 



-4 



The names of primary teeth are in small capitals. 



The bay formed by the upper arc of the outer lip, aud 

 usually limited by the upper palatal and angular teeth, is 

 called the SINULUS. This term has also been used extensively 

 in Clausttia, Ennea, etc., in the same sense. 



In Vertigo, the point of the outer lip, running forward or 

 bent inward, has been termed the AURICLE by Dr. Sterki. 



The ridge encircling the whorl behind and parallel to the 

 free margins of the peristome is known as the CREST (collar, 

 cattus cervicalis, bourrelet extcrieur, Nackemvulst) . 



(vii) 



