PLATE 35. 
Legend: p. Pedicle cavity. a’. Posterior adductors. 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5 
Fig. 6 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
a. Anterior adductors. 
ATHYRIS, McCoy. 
Page 777. 
Atsyris vitTaTa, Hall. 
Dorsal view of a normal individual. 
The hinge-plate; showing its trilobate form and the visceral foramen. 
The interior of the cardinal région of conjoined valves, the brachial 
valve being above. This view shows the elevation of the anterior 
face of the hinge-plate, the internal opening of the visceral foramen, 
the extension of the median lobe of the plate, the attachment of the 
crura to the crural lobes and their mode of union with the primary 
lamellz, a portion of which isshown. X 3. 
Hamilton group. alls of the Ohio. 
ATHYRIS SPIRIFEROIDES, Haton. 
The interior of a brachial valve. 
Hamilton group. Falls of the Ohio. 
. The interior of a pedicle-valve; showing the adductor and diductor 
scars. 
Hamilton group. Western New York. 
. A preparation of the brachidium, one of the spiral cones having been 
removed to show the structure of the jugum. X 2. 
Hamilton group. Alpena, Michigan. 
Dorsal view of a large and old shell having the surface lamellae 
highly developed. 
An internal cast of the pedicle-valve; showing the muscular scars and 
vascular impressions. 
Hamilton group. Western New York. 
CLIOTHYRIS, Kine. 
Page 779. 
Curornyris Roysu, Léveillé. 
Dorsal view of an average specimen; showing the concentric rows of 
flat spines. 
Keokuk group. Keokuk, Iowa. 
An enlargement of a portion of the surface. 
Chester limestone. Jackson county, Kentucky, 
222, 
