897 



Rhyn. 



Khynchonella pisum (pisa)^ Hall & Whitfield, Pal. Ohio, 



Vol. 2, 1875, page 135, 

 plate 7, fig. 18, 19, 

 dorsal and profile 

 views of a well formed 

 ventricose specimen ; 

 20, dorsal, shorter 

 form, with depressed convex valves; 21, long, venticose form, 

 unusually angular plications; 22, flat valved, young? speci- 

 men. Resembles B. neglecta in the same beds, but valves 

 more convex and folds not so sharp. The more ventricose 

 specimens resemble small R, nucleolata^ but are longer, beak 

 projects more, plications are never flattened and have not the 

 groove. Highland Co., O. Niagara^ Vb. 



Rhynchonella plena. {Atrypa plena^ Hall, Pal. N. Y- 



Vol. 1, Chazy). 

 Emmons, A. G. 

 I, ii, 191, pi. 3, f. 

 28,a, J,c,rf,beaks 

 ^^'^^ small and close 

 r/j pressed together; 15 to 20, plain, 

 undivided folds, four or five in the 

 hollow. Calciferous sandstone 

 (upper beds) ; common in Chazy 

 limestone. Logan's Geology of 

 Canada, 1863, page 126, fig. 50 a ventral, c dorsal valve. II a^ 

 III, 



Rhynchonella plicatella {Atrypa plicatella. 



NX Vol an 



N. Y. Vol. 2, 1852, p. 279, pi. 58, figs. 3 a-e ; 4 a, K {Tere- 

 iratula (Anomites) plicatella^ Linnse, etc. T, lacunosa^ Schlot- 

 heim, of Sowerby, Murchison, but not of Dalman and Hi- 



