Pr.ATB I.XXX— Continued. 



EUNELLA SIMULATOU. Hall. 



V%g. 27. Dorsal view of a specimen which has been cut to show the hiop. the recurved branch of which is 

 not retained. X 2. 



Hamilton group. IVidder, Ontario. 



EUXELLA LiNCKL.KNI, Hilll. 



Fi««. 28, 2fl. Doi-sal anil prt)tile views of a normal mature example. 



Hamilton jfroup. Canandaigaa iM-ke, New York. 

 Pig. 30. The loop of a varietal fonn of the species. 



Hamilton trroiip. Thuiider Bay, Michigan. 

 Vxgn. 31 , 32. Ventral and dorsal views of an internal cast ; showing the cavities left by the dental and hinge- 

 plates and the diverging muscular or vascular lines on both valves. 



Hamilton shales. Hamilton, New York. 



EuNELLA Hakmonia, Hall. 



FIga. 83, 34. Dorsal and profile views of one of the original specimens. 



Comiferous limestone. Fblls of the Ohio. 

 Vig. 36. Dorsal view of a broader shell, ground down to expose the loop. 



Comiferous limestone. Cayuga, Ontario. 



Subgenus CRANJENA, s.-gen. nov. 



Page 297. 



Cran^na Iowensis, Ciilviii. 



Fig. 36. Dorsal view of a large example fi-om which the shell has been partially exfoliated, exposing the 



muscular markings of the bi'a<;hial valve. 

 Pigs. 37, 38. Profile and dorsal views of a normal individual retaining the shell intact and showing the del- 



tidial plates. 

 Fig. 39. Dorsal view of an internal cast j showing the muscular scars of the brachial valve and the cavities 



left by the dental laniells of the jiedicle-valve. 

 Hamilton group, lioekford. Iowa. 



