I'LAXK VII— €oiilinue<I 



A VICULOPECTEX DOLABRIFOK.M is. 

 Pajje 26. 

 Kif.'. 21. A rifflit vnlve enlarged to two iliain«ters. The <*ai-s shoulil sbow, in the figure, rays similar t<i 

 those on the hoily of the valve. This figure is from the original sjiecinien of the specie.i. 

 Chemung grou)>. P/nUpxbiiry, N. Y. 



AviCULOPEgXEN CONVEXUS. 



I'agc 18. 



l"i". 2'J. A left valve enhirgoil ti^ two ilianietei'S. Tlie anterioi- ear .shnnlil show a .slight sinus in the 



margin for the byssns. 

 l'"ig. "JS. A iirolile of the i)i'ec(>(lingi showing the e.onvexity of the valve. (Original of tig. C, i>. 264, Geolog. 

 Rei>t. Fourth Dist. N. V.) 



rheninng gron]i. lioehi'ilh, N. Y. 



AVICULOPECTEN SIGNATUS. 



Page 28. 

 Kiif. 24. A left valve I'olarged to two diameters, showing the form ami surface markings. (Origimtl of 

 fig. .i, p. 264, Geolog. Re|)t. Fourth Dist. N. Y.) 

 Chemung grou)). liorkville, N. Y. 



Lyriopecten Polydorus. 



Page 50. 

 Kig. 25. The left valve de.seribed. The byssal sinus shouhl Vje deepei- than reju-esented. 

 Chemung group. Ccumadaga, N. Y. 



Lyriopecten tricostatis. 



Page 4S. 

 See Plates 4 and 10. 

 Fig. 26. All enlargement to two diametei-s of a i)ortion of thi> siirfni-c> nf a spec-inien of this .species. 

 Clieinuiig gi-onji. ^ear Elmira, N. Y. 



Aviculopecten tenuis. 



Page 39. 

 See Plate SI. 

 Kijr. 27. .\ h'ft valve, showing tlu' form and siirfaee marking.*. The si)eeimen also .shows the muscular 

 inipressiiin and pallial line. 



Chemung group. llinvUilph, jS'. Y. 

 Kig. 28. A larger s)ieeimeii of the sann\ AnotlnM- tigm-e is given on jilate 81, showing more clearly 

 the eharac.tei-s of the spei^es. 



Cliemiiiig group. NeaiNalamaiun.JV. Y. 



Aviculopecten celsus. 



Page 23. 

 Figs. 2H. 30. \ light valve, natural size and enlarged. 



Chemung grfiii]). Siilanmiiin, X. Y. 



Aviculopecten ellipticus. 



Page 2.'). 

 Kig. 'i\. A nearly entire left valve of this species. 



Chemung group. Meadmlle, Pa. 



Aviculopecten patulus. 



Page 24. 

 Fig. 32. A .small right valve as obtained from the inipivssion in thi' matrix. Tin' cats ai>' |iaitiall\ 

 restored in the figure. 



Chemung group. iSalamanca, jY. i'. 

 Fig. 33. A large left valve, .showing the characters of the shell as obtaineil from an im]iression in a tine 

 cong-lomerate. Thi^ hinge-line should be reju-eseuted as straight. 

 Chemung group. Near fialatnniica, jY. Y. 



