151 THE ELEMENTS 



Interstice, space between one pari 

 and another, a crevice. 



Intortion, the turning or twisting 

 in any particular direction. 



Involucel, a small or partial involucre. 



Involution, that part which involves 

 or inwraps another. 



Involuta, where the exterior is lip 

 turned inwards, at the margin, as 

 in all the Cyprea3. 



Juncture, the joining of the whorl of 

 the spire, &c. 



K. 



Keel, the longitudinal prominence in 

 the Argonautse. 



Knob, a protuberance, any part blunt- 

 ly arising above the rest. 



Knobbed, set with knobs, having pro- 

 tuberances. 



L. 



Labra, the lip. 



Lacinate, jagged or cut into irregular 

 segments. 



