74 
AUG. F. FOERSTE 
Locality and 'position. At McDill Mill, about 6 miles north 
of Oxford, Ohio, on the main branch of Four Mile creek, half a 
mile northwest of the point where it is joined by East Fork. 
In the lower part of the Whitewater member of the Richmond 
formation, just above the Gyroceras haeri (Meek and Worthen) 
bed. Found by Prof. W. H. Shideler, in whose honor the species 
is named. 
Remarks. The reference of these two free cheeks to Acro- 
lichas is based chiefly upon their association in the same strata 
with cranidia undoubtedly belonging to Acrolichas, and the fact 
that these cranidia also bear coarse pustules. The pustules on 
these cranidia are of two sizes; the conspicuous ones are large 
and flat, and between these are others which are much smaller. 
A cranidium found in the basal part of the Saluda, on Hanna 
creek, one mile east of Liberty, Indiana, by Prof. W. H. Shideler, 
apparenty belongs to the same species as the cranidia associated 
with Acrolichas (?) shideleri. 
A hypostoma of some species of Acrolichas, (plate XVIII, fig. 6) 
possibly Acrolichas harrisi (Miller) was found by Prof. Shideler 
just above the RhyncKotrema dentatum layer in the upper or 
Blanchester division of the Waynesville member of the Rich- 
mond, on Bull Run, less than a mile south of the railroad station 
at Oxford, Ohio. The anterior, broadly T-shaped half of the 
hypostoma is covered with numerous small pits. The lateral 
parts of the hypostoma are striated longitudinally with flexuous 
and more or less anastomosing lines. Along the posterior 
median parts, the pits are very minute and distant. 
Calymene abbreviata Foerste 
Plate XVIII, figs. 5 A, B 
Calymene abbreviata Foerste, Bull. Sci. Lab. Denison Univ., 16, 1910, p. 83, pi. 3, 
fig. 17. Jour. Cincinnati Soc. Nat. Hist., 21, 1914, p. 148, pi. I, figs. 14 A, B. 
The type of Calymene abbreviata was found in the Cynthiana 
formation, one mile south of Roger's Gap, Kentucky. It is 
characterized by the straightened, truncated anterior margin of 
the glabella. The anterior two-fifths of the glabella tends to be 
