102 



A MANUAL OF DENTAL ANATOMY. 



is continued up over the exterior of the enamel. This has 

 occurred less uncommonly than is generally imagined, and 

 the accompanying figure represents a portion of the crown 

 of such a tooth. 



If the section be made of the grinding surfaces of such 

 teeth as present rather deep fissures in these situations, 

 well marked and unmistakeable lacunal cells, or encapsuled 

 lacunae, will be met with with considerable frequency. Now 



FIG. 55 f 1 ). 



and then an encapsuled lacuna may be found occupying a 

 shallow depression in the enamel which it just fits, but 

 more commonly a dozen or more are crowded together in a 

 pit in the enamel, where they are usually stained of a brownish 



( l ) Nasmyth's membrane, set free by the partial solution of the enamel. 

 a. Nasmyth's membrane, b. Dentine, d. Mass occupying a pit in the 

 enamel, e. Enamel, a'. Torn end of Nasmyth's membrane. 



