(Figur 
PLATE ¥c. 
s 1, 2, 6-18, 25-11, by R. P. Whitpielu; 4, 5,19,‘4247, by E. Emmons; 3, 20-24, by J. C. McConnell.] 
Legend. A- Deltidium. 
t. Teeth. 
b. Sockets. 
fp. Crural plates, 
j. Cardinal process. 
c. Crura. 
a. Anterior adductor scars, 
a'. Posterior adductor scars, 
r. Diductbr scars, 
o. Ovarian markings, 
v. Vascular markings. 
DALMANELLA, nom. nov. 
Page 205. 
Orthis emacerata, Hall. 
Fig. i. The central cardinal portion of the interior of a brachial valve; showing the processes and 
muscular imprints. X 3. 
Fig. 2. The exterior of a brachial valve.' 
Hudson River group. Cincinnati, Ohio. 
For further illustration, see Palaeontology of Ohio, Volume I, plate viii, figs. 1, 2. 
Orthis Meeki, Miller. 
Fig. 3. The interior of a brachial valve; showing the cardinal process, crura and muscular scars. The 
apparent impressions in the umbo-lateral regions are due to abnormal thickening of the test. 
X 2. 
Hudson River group. /Spring Valley, Minnesota. 
Orthis Stonensis, Safford. 
Fig. 4. Profile of a specimen will 1 valves conjoined. X?. 
Fig. 5. A view of the pedicle-valve of the same specimen ; showing the alternating, fasciculate character 
of the radiating strise. X 2. 
Orthis sub^equata, Conrad. 
Fig. 6. A view of the brachial valve of the. original specimen ; showing the area and foramen of the op¬ 
posite valve. 
Figs. 7, 8. Profile and cardinal views of the same. 
Fig. 9. The articular and Muscular area of the brachial valve. X 3. ' ! 
Figs. 10, 11. Interiors of the pedicle and brachial valves. 
Trenton horizon. Mineral Point, Wisconsin. 
For further illustration, see Palaeontology of New York, Volume I, plate xxxii, fig. 2. 
Orthis perveta, Conrad. 
Fig. 12. View from the brachial valve of the original specimen. 
Figs. 13, 14. Brachial and profile views of a larger individual. 
Trenton horizon. Mineral Point, Wisconsin. 
For further illustration, see Palaeontology of New York, Volume I, plate xxxii, fig. 5. 
Orthis elegantula, Dal mail. 
Figs. 15, 16. Opposite sides of the same individual; showing the form of the species as occurring at this 
locality. J 
Fig. 17. The interior of a pedicle-valve, somewhat enlarged. 
Fig. 18. The interior of a brachial valve ; showing the muscular impressions and articular processes. X 2. 
Niagara group. Waldron, Indiana. 
Fig. 19. Cardinal view of the central portion of the brachial valve ; showing the composition of the cardi¬ 
nal process, the great elevation of the crural plates and crura, and their furrowed or crenulated 
outer walls. X 3. 
Upper Silurian limestone. Island of Gotland. 
For further illustration, see Davidson, Silurian Brachiopoda, pi. xxvii, figs. 1-9 ; Hall, Twenty- 
eighth Rept. N. Y. State Mus. Nat. Hist., pi. xxi, figs. 11-17. 
