16, NO M EN CI.4TU RE . 



hilabiata. Bilabiate ; constructed with both an 

 internal and external lip ; in opposition to 

 those shells which are destitute of the in- 

 terior one. 



dehiscens. Gaping ; the lower part of the lip 

 being distended. 



coarctata. Coarctate ; contracted^ straight : op- 

 posed to effuse. 



effusa. Effuse ; having the lips separated by a 

 sinus or gutter^ so that if the shell were 

 filled with water it would flow out at the 

 back part. 



reflexa. Reflex ; having the fore part of the lip 

 reflected towards the lowest whorl. 



repanda. Spreading ; having broad open lips. 



resupinata. Resupinate ; turned upwards. 



transversa. Transverse ; situated in a plane pa- 

 rallel to the inclination of the spiral line 

 of the whorls. 



denfata. Dentate ; furnished with teeth* 



Apex. Apex, Tip; summit of the spire. 



decollalus. Decollate ; apparently mutilated^ 

 having the spire, or the upper part of it, 

 horizontally cut off. 



