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



eye and also posterior to the middle of the palpebral lobe. Four 

 grooves form what here is described as the anterior pair of glabellar 

 furrows; two of these are directed transverse to the length of the 

 cephalon and two are very oblique. The transverse pair is located 

 slightly posterior to the mid-length of the cephalon; this pair is distinct 

 but shallow, about a millimeter and a half in length, and terminates 

 before reaching the dorsal furrow; it has a slightly convex curvature, 

 directed toward the front. A short distance anterior to the lateral 

 extremities of this pair, another pair of grooves is directed obliquely 

 forward; this pair is much more distinct, especially where it enters the 

 dorsal furrows; it also has a slightly convex curvature, the convex 

 side being directed toward the median part of the glabella. The middle 

 pair of glabellar furrows, noted in Phacops pulchellus, Foerste, is absent, 

 unless this pair is represented by a slight depression anterior to the 

 inner part of the posterior pair of glabellar furrows. The posterior 

 pair of glabellar furrows is continuous across the median part of the 

 glabella, but is much deeper laterally, especially for a distance slightly 

 more than a millimeter from the dorsal furrows. This furrow is curved 

 backward toward its extremities and that part of the glabella which lies 

 between the transverse anterior glabellar furrows and the lateral parts 

 of the posterior glabellar furrow presents a gently convex, more or less 

 lobate appearance. The occipital groove also is deepest at its lateral 

 extremities ; its curvature is sufficiently like that of the posterior glabellar 

 groove to give the intermediate part of the glabella the appearance 

 of a narrow transverse ring. At the lateral extreinities of this ring, 

 between the deep parts of the two grooves mentioned, this ring termi- 

 nates in two small, but distinctly defined circular nodules. A 

 corresponding flexture is noted in the corresponding parts of the neck 

 ring. The groove defining the basal part of the visual surface of the 

 eyes rises along the posterior part of the eyes, defines the inner part of 

 the palpebral lobes, and joins the dorsal furrows anteriorly. Between 

 18 and 21 vertical rows of facets occur on the visual surface, and the 

 middle rows contain at least 10 facets, but the state of preservation in 

 the specimens at hand is not perfect. The groove traversing the posterior 

 part of the fixed cheeks widens and becomes shallower laterally and 

 merges into the rather indistinct marginal groove of the cephalon. 

 The facial suture extends from the eyes forward and then slightly 

 above the anterior margin of the cephalon to the middle of the latter. 



Position and Locality: The specimen figured came from 

 the lower part of the Cedarville dolomite, in the Eastern Mills 

 quarry, southwest of Springfield, Ohio. A second cephalon 

 was obtained within three feet of the base of the Cedarville 

 dolomite, in the quarry at Euphemia, Ohio. 



Phacops handwerki, Weller, from the Racine beds near 

 Lemont, Illinois, is described as lacking both the anterior and 

 middle pairs of glabellar furrows, but in other respects the 



