PLATE XL. 



AUNIQENIA CaTSKILLENSIS. 



Pajtc 516. 

 Sec Plate SO. 

 Vig. 1. A vertically compressed specimen, giviiifr ii imritiw a,spect. to the valve. 



Tliis is the form orig-iimlly (lesci-ibcl by Va.vi'XBM as Cypricarditex aitgustata. 

 Kijfs. 2-4. The oiilinary forms of this species. 



Oneonta sandstone. Near lit. UpUm, A'. 1'. 



Elymklla fabalis. 



Fig'-'. 5, Jt. Two sj)ecimens of onlinary si/,(', retaining: both valves. 

 Hamilton group. Slurre of Crtxtkcd hike, N. Y. 



ElYMKLLA MUCliLOIDES. 

 Page 503. 

 Figs. 6-8 (10 ?). Individuals showing the jjhases of the species as observed in the Hamilton groii)i 



ElYMELLA 1'ATUT,A. 

 Page 505. 

 Fig. 11. A specimen preserviiifr the two vahes in conjunction. 

 Waverly group. Mtd'ma, 0. 



Glossites subtenuis. 



Page 495. 

 Figs. 12, 20. Two right valves. 



Hamilton group. Near Oeneva, N. T. 



Glossites amygdalinus. 



Page 501. 

 Figs. 13, 14. A right valve, and a specimen presei-ving the two valves in coiijiinctioii. 

 Yellow sandstone. BririingUm, Iowa. 



Glossites depkessus. 



i'ag« 496. 

 See Plate <»6. 

 Figs. 15, l7. Two left val\es of this si)ecios. 



Chennnig group. Ithaca and Elmira. N. Y. 



Glossites lingualis. 



Page 497. 

 See Plate 96. 

 Figs. 16, 19. A left and light valve as pi-esei-ved in soft shales. 

 Chemung gi-oup. liehiitml, N. Y. 



MoDiOMOKPHA Tioga. 



Page 291. 

 Fig. 18. A left valve. 



Chemung g^roup. Manxfield, Pa. 



