PLATE LXXXIII— Conlinueil. 



Genus HALLINA, N. H. Winchell and Schuciiekt. 



Pilgo 15(1. 



Hallina Saffordi, N. H. Winclicll and Sclnuliert. 



Fig-s. 36-38. Dorsal, pi-otile and ventral v-iews of a tyijical exami)ie. X ■'). 

 Trenton limestone. Lebmum, Ttniwsste. 



Genus ATHYRIS, McCoy. 



Pago Si. 

 See Plate.s 45-47. 



Athyris incrassata, Hall. 



Fig. 39. The interior of a pedicle-valve (jf average size ; showing the pedicle, adductor and diduclor im- 

 pressions, and the thickened shell-margins. 



Warsaw limestone. Desmoines Rioei; Iowa. 



Genus STRICKLANDINIA, Billings. 



Page 249. 



See Plate 73. 



Stricklandinia Chai'mani. sp. nov. (Compare Billings, Pala^izoic Fos.sils, vol. ii, 



l)t. i, pi. vii, Hg. 3). 



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

 veloped cardinal area. 



Niagara group. Hamilton, Ontario. 



Subgenus CRANiENA, s,aEN. nov. 



Page 2y7. 

 (.;KAN.i;NA loWENSIS, Calvill. 

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

 tained X 2. 



Middle Devonian. Fayette, lima. 



