

mm 





/Y. 52. 



A;i44- 



Left: above, Boring Crustacea, Lintnorla (slightly enlarged). 



below, Boring mollusc, Xylopkaga. 

 Right: Wood bored by Limneria; notice how the hard knot has not been 



bored. Natural size. (pp. 142, 143, 146). 



