PL \ IT. \\.\III- i ..iiliiiu.il 



Mv I II LHCfl (' 1RINATA. 



Pi ... ■.•:,'.!.■ 



See Plate 32. 



Fig. s . &.n'enlargement of the cardinal portion of fig. 19, plate 32, .-is obtained from an impression, showing 



more clearly the binge characters, 



Chemung group. Neai Elmira, X. T. 



MODIOLA (MyTILOPS) PR;ECK1>KNS. 

 Page 267. 

 Fig-. 9. A small left \ al\ •■ denuded ol the stria 1 . 



Figs. 10, II. Cardinal views of twos] imens with the valves parti) opened. 



Pig. 12. A small right valve. 



Pig. 13. A left valve of medium sizo, preserving the surface stria. 



Fig-. 14. An elongate right valve, showing tin- surface characters. 



Chemung group. Olean, N~. Y. 

 Pig. 15. A i-iirlit valve, probably of this species but showing no surface strise. 



Chemung group. Smethport, Pa. 

 Pig. 16. The cardinal view of a specimen, with both valves strongly striate. 



Fig. IT. A large broad >) imen preserving the surface markings. 



Pig. 18. 'I'll.- anterior \ i» • \% of an example showing nearly equal convexitj of both \ al\ es. 



Chemung group. Olean, N. Y. 



MyTILARCA SIMPLEX. 

 Page 261. 

 Pig. 19. A large right valve, showing varices of growth. 



Pig. 21. A smaller left valve. The beak should be directed slightly to the left to give the proper expres- 

 sion t.. tli.. figure. 



Chemung group. Bmethpwt, Pa. 



MyTILAKCA GUSBOSA. 

 Page ■-•«•-'. 

 See Plate 87. 

 Fig.. 20. Tlir left valve described. Another figure is given on plate ST. Eg. 7. 

 Chemung group. Napoli, Cattaraugus Go., X. Y. 



Mytjxarca lata. 



Page 263. 

 Fig. 22. A right valve showing the broad form of the shell. 

 Chemung group. Randolph, N. Y. 



Modiola (Mytilops) metella. 



Page 26S. 

 See Plat.. 87. 

 2:!. 24. Two right valves showing the general form of the shell. A figure of another specimen is given 

 on plate 87 in the same position as the figures of .V. ,.»./. ■../.»« .m, tin- present plate for a better 

 comparison. 



Chemung group. Chautauqua Co., X. Y. 



