IT.ATK l.XXX— tontiiiued. 



EUNELLA SIMULATOR. Hall. 



Fig. 27. Dorsal view of a specimen which has been cut to show the h)oii, the recurved liranch of wliich is 

 not retained. X 2. 



Hamilton group. IVicldei; dnlarhi. 



EUNELI.A LlNCKL.ENI, HmII. 



Figs. 28, 29. Dorsal and pi'otile views of a normal matui-e example. 



Hamilton group. CanaiulaUjiia Lake, Neif York. 

 Fig. 80. The loop of a vai-ietal form of the species. 



Hamilton grouj). Thundft)' Bay, M'wlngan. 

 Figs. 31 , 32. Ventral and dorsal \-iews of an intiM-nal cast ; showing the cavities left by tlie dental an'l liinge- 

 plates and the diverging muscular or vascular lines on lioth vahes. 



Hamilton shales. Hamilton, New York. 



EuNELLA HaRMUNIA, Hllll. 



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



Coniiferous limestone. Fallf! of t?ie Ohio. 

 Fig. 35. Doj'sal view of a broader shell, ground down to exjjose the loop. 



Comiferous limestone. Cayuga, Ontario. 



Subgenus CK/VN-^NA, s.-gen. nov. 



Page 29". 

 C'RANiENA IowENSIS, Cillvill. 



Fig. 36. Dorsal view of a lai-ge example from which the shell has been partially exfoliated, exposing the 



muscular markings of the brachial valve. 

 Figs. 37, 38. Protile 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 ; showing the muscular scars of the brachial valve and the cavities 



left by the dental lanielltE of the pedicle-valve. 

 Hamilton grouji. Rofkford. lottM. 



