PLATE XVIII 
Fig. 1. Calymene sp. (Lorraine form). Enrolled individual from Lorraine 
formation at Don Valley brickyards at Toronto, Canada. 
Fig. 2. Calymene retrorsa Foerste. Lateral view of type; see Bull. Sci. Lab. 
Denison Univ., 16, 1910, p. 85, pi. 3, fig. 19. From middle or Clarksville division 
of Waynesville member of Richmond formation, on Silver Creek, east of Dun- 
lapsville, Indiana. 
Fig. 3. Calymene meeki Foerste. Lateral view of type; see Bull. Sci. Lab. 
Denison Univ., 16, 1910, p. 84, pi. 3, fig. 18. From Fairmount member of Mays- 
ville formation, at Cincinnati, Ohio. 
Fig. 4. Calymene retrorsa minuens Foerste. Enrolled specimen, from White- 
water member, at Richmond, Indiana, collected by John Misener. 
Fig. 5. Calymene abbreviata Foerste. A, cranidium; B, pygidium, with 
posterior part preserved. From Cynthiana formation at quarry east of Ivor, 
Kentucky. 
Fig. 6. Acrolichas harrisi (Miller) (?). Hypostoma; found in Blanchester 
division of Waynesville member of Richmond formation, on Bull Run, southwest 
of Oxford, Ohio, by Prof. W. H. Shideler. 
Fig. 7. Calymene breviceps Raymond; the posterior part of the occipital ring 
is broken off. Glabella. From Waldron shale at Newsom, Tennessee. 
Fig. 8. Calymene sp. (West Union form). A, cranidium; B, pygidium. From 
the Trimerus delphinocephalus zone, ten feet above the base of the Bisher mem- 
ber of the West Union formation. 
Fig. 9. Encrinurus ornatus Hall and Whitfield. A, pygidium, with the pos- 
terior tip missing; B, lateral view of same. From the Cedarville dolomite at the 
long abandoned quarry southeast of Wilmington, Ohio, west of the county 
infirmary. 
Fig. 10. Encrinurus thresheri Foerste. Pygidium, with the posterior tip not 
clearly exposed, and with the anterior margin of the axial lobe missing; both 
restored. Type; see Bull. Sci. Lab. Denison Univ., 2, 1887, p. 101, pi. 8, fig. 26. 
From the Brassfield formation, at Dayton, Ohio. 
Fig. 11. Calymene cedarvillensis Foerste. A, entire individual with right 
side and anterior margin distorted by crushing; B, part of cranidium; C, frag- 
ment of another cranidium. From the Cedarville dolomite at Cedarville, Ohio. 
Fig. 12. Calymene niagarensis Hall. A, cephalon of enrolled specimen; B, 
lateral view of extended specimen. From the Rochester shale of New York, 
loaned from the New York State Museum, at Albany, through the courtesy of 
Dr. Rudolph Ruedemann. 
