PLATE XCYI. 
Pholadella radiata. 
Page 169. 
See Plate 78. 
Fig-. 1. A cardinal view of a specimen showing the convexity of the valves. 
Hamilton group. Near Cumberland, Md. 
Cypricardinia indenta. 
Page 485. 
See Plate 79. 
Fig. 2. A right valve redrawn from the'specimen tig-. 7, plate 79. 
Upper Helderberg group. Babcock's hill, N. Y. 
Cypricardinia consimilis. 
Page 486. 
See Plate 79. 
Fig. 8. A right valve with the beak broken away. 
Waverly group. Warren, Pa. 
Fig. 
Pal.eanatixa sinuata. 
Page 491. 
4. A left valve showing the form and proportions. 
Chemung group. Warren, Pa. 
Prorhynchus QUADRATUM. 
Page 492. 
See Plate 79. 
Fig. 
Fig. 
5. A large left valve. 
Chemung- group. Near Smethport, Pa. 
Prorhynchus nasutum. 
Page 493. 
6. A specimen retaining both valves in conjunction. The anterior nasute extension of the left valv 
has been broken away. 
Chemung group. Warren, Pa. 
Prorhynchus angulatum. 
Fig. 
7. A large right valve. 
Chemung group. 
Page 493. 
Warren, Pa. 
Glossites ELDIFTICUS. 
Page 498. 
Fig. 8. The right side of a specimen with the valves partially open and attached by the ligament. 
Chemung group. Mansfield, Pa. 
