PLATE XCVI. 

 Pholadella radiata. 



Page 469. 

 See Plate 78. 

 Fig. 1. A cai-dinal view of a specimen showing the convexity of the valves. 

 Hamilton group. Near Cumberland, Md-l , 



Cypricardinia indenta. 



Page 485. 

 See Plate 79. 

 Fig. 2. A right valve redrawn from the specimen fig. 7, plate 79. 



Upper Helderberg group. Babcock's hill, iV. Y. 



Cypricardinia consimilis. 



Page 4t6. 

 See Plate 79. 

 Fig. 3. A right valve with the beak broken away. 

 Waverly group. Warren, Pa. 



PAL.ffiANATINA SINUATA. 

 Page 491. 

 Fig. 4. A left valve .showing the foi-m and proportions. 

 Chemung group. Warren, Pa. ' 



Pkorhynchus quadratum. 



Page 4<J2. 



See Plate 79. 

 Fig. 5. A large left valve. 



Chemung group. Near Smetbport, Pa. 



Pkorhynchus nasutum. 



Pago 493. 

 Fig. 6. A specimen retaining both valves in conjunction. The anterior nasute extension of the left valve 

 has been broken away. 



Chemung gi-oup. Warren, Pa. 



Pkorhynchus angulatum. 



Page 493. 

 Fig. 7. A large right valve. 



Chemung group. Warren, Pa. 



Glossites ellipticus. 



Page 498. 

 Fig. 8. The right side of a specimen with the valves partially open and attached by the ligament. 

 Chemung group. MansfuUl, Pa. 



