Fig. 86. One valve of the phyllopod crustacean Ecliinocaris punctata with marks 
of Clionolithes borings among the surface ornament. Hamilton group (Middle 
Devonian). 
Fig. 87. Clionolithes replans; diffuse tubules in the shell substance of the brachio- 
pod Leptostrophia. x 20. Oriskany (Lower Devonian). 
Fig. 88. The pvgidium of the trilobite Homalonotus Dekayi exposing by weather- 
ing the tubules of a similar species; natural size. Hamilton group (Middle 
Devonian). 
