IM.AI'IO XXXIII— CoiUinue.l. 



IMvTIIAIiCA CAHINATA. 



I'aKc iV.!.-. 



See Plate 32. 



Fig-. 8. Airenlargeinent of the cardinal portion of fig. 19, plate 32. lus ohtaiiieil from an iiiipros.sion, showing 



more clearly the hinge characters. 



Cliemnnf,'- ^'roni>. Near Elmira, N. Y. 



MoDiOLA (Mytilops) pr^cedens. 



Pat'O 2U7. 

 Fig. '.'. A sntall left valve denuded of the strife. 



Figs. 10, 11. Cardinal views of two sperimen.s with the valves partly opened. 

 Fig. 12. A .small right valve. 



Fig. 13. A left valve of medium .size, preserving the surface stria-. 

 Fig. 14. An elongate i-ight vahe, showing the surface characters. 



Chemung group. Oltan, JV. Y. 

 Fig. 15. A right \alve, prob.'ibly of this species but showing no surface stria". 



Chemung group, ^methport, Pa. 

 Fig. 16. The car<Uiuil view of a specimen, with both valves strongly striate. 

 Fig. 17. A large broail specimen jireserving the surface markings. 

 Fig. IS. The anterior view of an example showing nearly equal convexity of both valves. 



Chemung group. Olean, iV. Y. 



Mytii.auca simplex. 



Page 261. 

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



Fig. 21. A smaller left valve. The beak should be directe<l slightly to the li'ft to give the proper expres- 

 sion to the figure. 



Chemung group. Smethpni't, Pa. 



.MVTILAUCA GIBBOSA. 

 Page 26J. 

 See Plate 87. 

 Fig. 20. The left vahe descritted. Another figure is given on jilate 87, fig. 7. 

 Chemung grouj). Napnl), Cattaraugiis Co., N. Y. 



MvTILARCA LATA. 



Pace 263. 

 Fig. 22. A right valve showing the lii'oad form of the shell. 

 Chemung groui). Randolph, N. Y. 



MoDiOLA (Mytilops) metella. 



Page 208. 

 See Plate 87. 

 Figs. 23, 24. Two right \alves showing the general form of the shell. A figure of .another specimen is given 

 on plate 87 in the same position ils the figures of M. prascedtn.s on the present plate for a better 

 comparison. 



Chemung group. Cliautauqua Co., N. Y. 



