PHYLUM ARTHROPODA 

 Class Crustacea 



SUBCLASS TRILOB1TA 



Genus Phillipsia Portlock 

 Phillipsia trinucleata Herrick 



1887 Phillipsia trinucleata. Herrick, Bull. Den. Univ., Vol. 2, p. 64, PL 1, Fig. 23; 

 PI. 2, Fig. 32; PI. 3, Fig. 21. 

 Coal Measures: Flint Ridge, Ohio. 



Several small pygidia from the Sharon member are here referred 

 to P. trinucleata, but they differ in the absence of the minute granules 

 on the surface which are present in Herrick's species. These, however, 

 are so minute that they may easily have been destroyed. The form 

 is relatively common in the Lower Mercer and higher horizons. 



Horizon and locality. Sharon member: Lick Run, Scioto County 

 (Locality 2), r; east of Tattle Creek, Scioto County (Locality 6), c. 



88 



