PLATE l.XXVIll— Contlnuo.l. 



Pholadklla Newbkkryi. 



I'nge 471. 

 Kijr- -5. A loft valve shuwiiijr tin? fni-iii niul 8Ui-fa<re markiiijff . Tho posterior extremity is i-estoi-ed in the 

 tig'ure. Wnverly gTOiip. Licking Co., 0/iio. 



Grammysia constkicta. 



Page 377. 

 See Plate SO. 



FigB. 26, 27. Two right valves enlarged to two diauietei-s showing the form and surface characters. 

 Kig. 26, Hamilton group. Otsego bo'., if. T. ' 



, PROMACRU8 CUNEATU8. 

 Page 510. 

 Fig. 38. The anterior portion of an imperfect right \ alve. 



Burlington Bandstone. Barlingtoti, Jotoa. 



ORTHONOTA ? PARVULA. 

 Page 48-2. 

 See Plate 65. 

 Figs. 29-32. Four specimens retaining both valves in conjunction, showing some variation in size and pro- 

 portion. Figs. 29, 30 and 31, enlarged to two diametei's. 

 Hamilton group. N. Y. 



SOLEN (PaL.«;OSOLEN) SILIQUOIDEA. 



Page 183. 

 Fig. 33. The right valve described. 



Hamilton group. Schoharie Co., N. T. 



Orthonota oarinata. 



Page 479. 

 Fig. 34. A specimen retaining both valves conjoine<l along the hinge, enlarged to two diameters. 



Hamilton group. IShore of Cayaga lake, N. T. 

 Fig. 35. A right valve, natural size. The posterior extremity is incorrectly restored in outline. 



.'. 1 t.'.iti.;i /.i.ir<(i/..i(i! 



Orthonota ensiformis. 



Page 480. 

 Fig. 36. A view of the right valve described as obtained from a gutta-pereha impression of the natui-al 

 mould. Hamilton group. Sclioliarie Co., N. Y. 



Orthonota undulata. 



Page 478. 

 Fig. 37. A young in<lividual reigning both valves. 



Hamilton gi-oup. Bear's gulf, Seholuiru'. Co., N. Y. 

 Fig. 38. A specimen of medium size preserving both valves, conjoined at the hinge-line. 



Hamilton group. Beat'* gulf, Schoharie Co., N. Y. 

 KgH. 39, 40. Left and right valves showing the forai and surface characters. 



Hamilton group. Schoharie Co , K. Y. 

 Fig. 41. The right side of a large specimen. 



Hamilt<m group. Bear's gulf, Schoharie Co., N. Y. 

 Vig. 43. The right side of a somewhat smaller individual. 



Hamilton g^np. Fhtltonham, Schoharie Co., N. Y. 



