PLATE LXVII 

 G™ CONCHIDIUM, Lxn^,. 



P^ge 231. 



" "r"""'"" "taw .„«•„..., , °"~'" °' Pl.»«o™ ,v.r H. 



-■ 'i" r4'tti:::srrs - """ '" '"^" '""•"« — -« 



Fig. 

 Figr. 



t'uelph dolomites, ffalt, Onta,-io. 



^^- 6, 7. Dorsal and t , ^''''''"''''^^ SCOPARIUM, sp. „ov. 



the species a Jp\U~:,^-!^^^^ she,,. sHo.in, .he o„t,i„e of 



Guelph dolonutes. Ife^w, 0,.torto "' *''"''*'°"- 



Fics 8 q V .  . t:ONCHIDIUM OBSOLETUM, SI). Iiov 



*'««. 8, 9. Ventral and doreal views of an internal cast of a «^ 



Genus PENTAMERUS, Sowerby. 



Page 23«. 



Kit 10 A VI. , . """""""■ ■•'"oiBBostre, Hull .„d Whilfleld 



P,S 15. P„.l, „.» ., . „„,,„ ,„,.„„„ ,„, , ,^ ,^. _^^^ ^^ 



Ni.,^™ ,|olo,.ite., »-«..■ ifO„rt„. B-tom,,, • "PM... 



"'^ '" ''';S:anff::^rtLrdir:^ wMch^howswIt,. ^ue^ disti„ctne. tKe posi. 



Chert of the Niagara group. PVuconMn. 

 Fig. 17. Profile of a small and gibbous internal cast, having somewhat the form of the P oblo,iam var 



MaqiMketa (see figs. 11-13), but less regularly convex. ' 



Figs. 18, 19. Cardinal views of internal casts; showing the variation in the convexity of the valves and 

 the position of the internal apophyses 



Niagara dolomites. JYear Milwaukee, WuconMn. 



