PLATE LXXXIU— Continued. 



Genus HALLINA, N. H. Winchell and Schuchebt. 



Page ISO. 



Hallina iSaifordi, N. H. Winchell autl Schuchert. 



Figs. 36-38. Dorsal, pi-otile and ventral views of a typical example. X 5. 

 Trenton limestone. LebaTuniy Tennessee. 



Genus ATHYRIS, McCoy. 



Pago 83. 

 See Plates 45-47. 



AtHYRIS INCRA88ATA, Hall. 



Kg-. 39. The interior of a i)edicle-valve of average size ; showing the pedicle, adductor and diductor im- 

 pressions, and the thickened shell-margins. 



Warsaw limestone. Besmoines Miver, Iowa. 



Genus STRICKLANDINIA, Billings. 



Page 24D. 



See Plate 73. 



Stricklandinia Chapmani. sp. iiov. (Compare Billings, Palaeozoic Fossils, vol. ii, 



pt. i, pi. vii, fig. 3). 



Fig. 40. An incomplete internal cast of the pedicle-valve ; showing the impression left by the highly de- 

 veloped cardinal area. 



Niagara group. HamiWm, Ontario. 



Subgenus CRAN^NA, s.-gen. nov. 



Page *J7. 



Ckan^na Iowensis, Calvin. 



Fig. 41. A preparation showing the structure of the loop, the ascending branches being but partially re- 

 tained X 2. 



Middle Devonian. Payette, Jawa. 



