^I'l.VTK XXV— Coiitiiiueil. ' 



Leitouesma Okodes. 



See Plato 90. 

 Figs. 0. 0. Two left val\o.«. The .s])i-ciiiien fig. 9, is reiliawn on pi. 00, fig. 8. 



Fig. 10. A largo l>'fl valve soincwliat ilistorted by pic^ssure ami ref«;n>e.l to the specie.'! with .loulit. 

 Chemung group. JVrar tSinet?iport, Pa. 



Leptodesma mytiliforme. 



Paso 2:J3. 

 See Plate 91. 

 Figs. 7, 11. A right and left valve. Other illustrations of these specimens are given on plate 91. figs. 22 

 and 24, .'ihow-ing more clearly the specific charac^tei-s. 

 Chemung gi-oui). Near Smethport, Pa. 



Leptodesma Maclurii. 



Page 'JiS. 

 Soo Plate 91. 

 Fig. 8. A right valve. See fig. 14, pi. 91, for another figure of thi.s specimen. 

 Fig. 13. A left valve. Another figiu-e of the .specimen is given on plate 91. fig. 13. 

 Chemung group. Near Smttliport, Pa. 



Leptodesma rude. 



Page 2-21 

 See Plate 91. 



Fig. 12. The left valve described. See fig. 3, pi. 91. 



Chemung group. Near SmeUiporf, Pa. 



Gr-YPTODESMA ERECTUM. 



Page loi. 

 See Plates 11, 12, 13, 8(5 and 87. 

 Fig. 14. An interiud mouhl of the upper portion of a left valve shownng the lateral teeth and striated 

 ligameiital area. The large scar on the post-umbonal slope was probably made by the 

 attachment of a Crania to the shell and covei-s a portion of the large muscular impression. 

 Hamilton group. From a boulder near Ni(hol.i, N. Y. 

 Fig. la. An internal cast of a right valve, showing the pallial line and im)irinl of a strong posterior tooth. 



Hamilton grouj). Otsego Co., N. Y. 

 Figs. !i;, 17. A riL'-hl and a left valve a.s preserved in a cherty limestone. 

 Hamilton gi-oup. Indiana. 



Pal;eopinna flabella. 



Page 240. 

 See Plate 87. 

 Fig. IS. Till' li'ft valve desci-ibed. See plate 87, fig. 4. 



Oriskany sandstone. iScJioharie. N. Y. 



Pai..eopixna kecurva. 



Page 241. 

 Fig. 19. A view of a lai"ge imperfect li'ft valv<r. 



I'pper Helderberir irrcmp. S'laffurd. Ciene.tee Co., N. T. 



