388 The Ohio Journal of Science [Vol. XIX, No. 7, 



parviusculus possibly may be distinguished by the entire absence or 

 at least considerable indistinctness of these furrows. In Proetiis 

 parviusculus the basal lobes may be indistinctly indicated by a slight 

 depression of the glabella there where the furrow limiting these lobes 

 might be expected, but usually this depression is too indistinct to attract 

 attention even on careful search. 



The indistinctness of the basal lobes of Proetus parviusculus, 

 found in the type specimen of this species, is not confined to 

 specimens of Proetus occurring in the Maysville formation, but 

 occurs also in forms found in much lower strata. 



A cranidium found in the railroad cut north of Cynthiana, 

 Kentucky, in strata referred to the Cynthiana formation, can 

 not be distinguished from Proetus parviusculus. 



Another cranidium (Plate XIX, Figs 10, A, B), found in 

 the upper part of the Benson member of the Trenton formation, 

 directly beneath the Brannon member, northwest of Bridge- 

 port, Kentucky, associated with Strophomena vicina Foerste, 

 also bears a close resemblance to Proetus parviusculus, but 

 the glabella is a little flatter, and there are very faint traces 

 of glabellar furrows, too faint, however, to suggest Proetus 

 undid ostriatus, if the presence of distinct glabellar furrows 

 be regarded as an essential characteristic of that species. 



Apparently those specimens of Proetus having distinct 

 basal glabellar lobes are more common in the Ordovician strata 

 of the New York basin, and those with indistinct basal glabellar 

 lobes are more common in the Ordovician areas surrounding 

 Cincinnati, without regard to separation of these strata into 

 Cincinnatian and Trenton formations. 



A pygidium of Proetus was found half way between Flag 

 run and Emily run, about 4 miles west of Drennan Springs, in 

 Henry county, Kentucky. Here it occurred in that part of the 

 Cynthiana formation to which Ulrich applied the term Gratz. 

 A pygidium w^as found within five feet above the level of the 

 railroad at the exposure south of DeMossville, on the northern 

 edge of Pendleton county, in strata also referred to the Cynth- 

 iana formation. Another pygidium occurred in the Cynthiana 

 formation north of Rogers Gap, Kentucky. The pygidium 

 from the locality west of Drennan Springs possesses the 

 following characteristics: 



The axis of the pygidium is prominent, and is crossed by three distinct 

 rings and also by three rings becoming successively much less distinct, 

 leaving at the posterior termination of the axis a space equal in length 



