The Rogers Gap Fauna of Central Kentucky 147 



cipital segment is mnch more strongly bent downward laterally and 

 differs otherwise in form. A small pygidium of Proetus, about 2.5 

 mm. in length, was found at the railroad cut north of Rogers Gap, 

 about 55.8 miles from Ludlow. The axial segment rises strongly 

 above the only moderately convex lateral parts. These fragments 

 may not belong to the same species. Proetus iindulostriatus is 

 figured by Ruedemann on plate 9 of Bulletin 16'2, published bv 

 the New York State Museum. 



46 — Dalmanitcs achates, Billings (Plate I, Fig. 18) — A spe- 

 cies closely related to Dabnanites achates, Billings, from the Tren- 

 ton of Ottawa, Canada, and Trenton Falls, New York, is repre- 

 sented by an imperfect cephalon found at railroad cut 54.8 miles 

 trom Ludlow. The chief characteristic of this species is the trans- 

 versely much elongated frontal lobe of the glabella, with a mod- 

 erately convex anterior margin. The glabellar lobation, the posi- 

 tion of the eyes, the length and form of the genal spines is identical 

 with that of Dabnanites achates. A rather elongate pygidium, 

 found at the cut 55.8 miles from Ludlow, may belong to the same 

 species, but this is uncertain. It occurred in the same rock frag- 

 ment with the pygidium of Proetus mentioned above. The gla- 

 bella, including the smaller lobes, the occipital segment, and even 

 the fixed cheeks is ornamented with relatively distant large and 

 small granules. Apparently the same species occurs at the first 

 large exposure west of bridge 54, west of the ^Million tunnel in 

 Madison County, Kentucky, about 10 feet above the railroad track. 

 If so, the eyes of this species are fully as tall as wide, and stronglv 

 facetted. Dalntanites achates is figured on page 7?7 of the Geology 

 of ?^Iinnesota, volume 3. 



47 — Acidaspis sp. — An unknown species is represented by 

 movable cheeks at the railroad cuts 54.8 and 54.6 miles from 

 Ludlow. 



48 — Ceraurus sp. — The central part of a cephalon, lacking 

 the movable cheeks, was found at 54.5 miles from Ludlow, in the 

 same rock fragment as Strophoinena Jiallie, ^liller. It belongs to 

 the group with moderately expanded anterior glabella. Specimens 



43 



