.IIJZ MTAjq 



PLATE XI<n— ContInne<i: 



Gojsioi'HOKA Ida. 

 18 1<>»1 siira«e aoo. I nemboqs lUnm «lo sbbi idiJrt sifT .1 .-jiH 

 • 8ee Platfi 65. ' ~ yi"^ 



Kig. 13. A si>ecimen retaining both valves connected by the hinge ligament. 



Hamilton group. Belhna, N. F. ''■ •'i''^"''"'"'^ ■*"•» «"-i"«l3« 



GONIOPHORA 8UBRECTA. 

 Page SW. 



See Plate 44. 

 Fig8. 14, 15. Two left valves. :jlri li.r I jiH 



Chemung group. CharlotteTiiUe and Jefferson, ScbdiarieOo.t.N. y 



i ./. .:«iv>kV>i\ iV' 'iix srxurforfofl 

 MiCRODON (CyPRICARDELLa) TENUI8TRIATU8. 

 Page 310. ' ' ' ' 



See Plates 73. 74. ...vf-^ ,rf^h / 



Pig. 16. A cardinal \'iew of a sjiecimen i"etaining both valves. .^;,I 



Hamilton group. Ciiinherland, Md. 



MiCRODON (CvPBICARDELLa) BELLI8TRIATU8. 

 Page 308. 

 See Plates 73, 74. 

 Fig. 86. A short and broad right valve, showing the hinge and the cardinal teeth. ''^ ■♦!"«* / 



Hamilton group. LudloxBville, N. Y. 

 Fig. 17. A cardinal view of a small specimen preserving both valves. -■ 



Hamilton grouj). Cnmherland, Md. >>Hq)fJ) 



Fig. 18. A specimen showing the valves opened and attached along the 'hinge-line. 



Hamilton gi-oup. BdUma, N. Y. 

 Pig. 19. An unusually short and bi-oad form. ; , : ' 



Hamilton group. Shore of Cayuga lake, N. Y. 

 Fig. 20. An enlargement of the hinge of a right valve. 



Hamilton group. Shore of Seneca lake, N. Y. . ^. . 



'1 1)1111 i^-iii'w ■uUi! '1«7 rtal A .01 .-gVi 



MiCRODON (CVPKICAftDliJt-LX') MAJOK. 

 Piiiie 307. 

 Pig. 21. A right valve showing the form of the shell and the Surface markings. 

 ComifeTOUs limestone. Delaware, Ohio. 



MiCRODON (CyPRICARDELLA) COMPLANATUS. '!' J*!^" ' 



Page 311. 



See Plate 74. 



Fig. 22. The left side of a specimen which is a partial cast or the interior, showing the muscular si^ra and 



pallial line. 



Hamilton group. NorvAeh, N. Y. 



•no'n 7roff^ oJ nwjnbai ^vUv ftoJ A .CI .1|1M 



• iiifiinAffTk 



