n.Yii: i. xvii. 



PAM 



006 



Fit/*. I U> 6 OONKAUELI.A <>\.\ - 



I Lateral view n( an alnuwt perfect tod unusually large specimen, showing the 



decided obliquity <>f the transverse lamella? which characterizes this specie*. 



Shales of the Black Klvi-r group, Cannon Kail*, Minnesota. 



2 and 3 Two views of another specimen, slightly exceeding the average size. St. Paul, 



Minnesota. 



4 Part* of two whorls of another specimen from St. Paul, > 2, the slight dentlcula- 



lion* ..f tin- edge representing the prominent tannin* of the slit-band. The 



ii.- at the upper right-band corner of the figure Is at the beginning of 



the open -lit. 



6 View of the back of part of the silt portion of a third specimen from St. Paul, 



xt, having unusually prominent Imbrications. 



6 Dorsal surface, x4, of same specimen that furnished flgure 4, showing ullent 

 silt-band with Its distant lunula>, and surface markings. 



KigS. 7 U> 10 OONRADELLA riMBRIATA U. and S HOT 



(8M kl*o pUte i.xu.1 



7 and 8 Two views of a large specimen. Stones River group, Minneapolis, Minnesota. 

 The mnl. Hi. -us i- filled with stony matter and the left side ..f ill-- apertural 

 expansion broken away In the original of these figures, but an the missing and 

 hidden part* are clearly shown by other specimens, no apology Is necesxary 

 fur restoring them In th<- drawings. 



9 Portion of the terminal expansion and of the broken batws of two preceding 

 expansions of same, x2.5, 'showing fine surface markings. The right 

 margin of the flgure represents the edge of the slit. 



10 Apertural view of a small specimen showing the expansion entire on <me side. 

 Geological and Natural History Survey of Minnesota, Museum Register 

 No. 8724. 



!-. ll OONRADELLA INBRICATA Meek and Worthen sp 911 



Lateral view of a small but highly characteristic specimen of this species. 

 Trenton group, Alexander county, Illinois. 



FlgS. 12 tO 15 CONRADKLLA ELEOANS Miller gp 911 



1^ Lateral view of a specimen of the usual size, Lorraine group, Cincinnati, Ohio. 

 13 and 14 Lateral view of the natural size, and apertural view x2, of the largest specimen 



seen; from the same locality. 

 15 Small portion of the left dorsal slope of same, x4. 



FlgS. 10 tO 18 CONRADKLLA KKANUIS I'lrich 906 



(Hee aho plt i-xii > 



18 and 17 Two views of a large specimen of this species. Stones River group, Lebanon, 

 nessee. The specimen occurred In solid limestone, one side being now a 

 cast of the interior, while the other retains some of the shell with the broken 

 bases only of the transverse Israeli*. 



18 Small part of the side of another specimen showing the Imbricating lamolhc 

 entire. 



Figs, 19 to 22 COHKADKI.I.A TIM A so CLARIS U. and S 908 



IB to 21 !..! ral views of throe specimens showing very decided variability In the 

 number of the transverse Imbrications. All are from the Stones River group: 

 Hi.- tlrsi. from I.. ..-;i u ,- . n-:r>. has unusually numerous Imbrications; In tin- 

 second, from I>ixon. Illinois they. are much fewer In number; In the third, 

 from Minneapolis, Minnesota, their number Is not far from an average for 

 the species. 

 Section of a specimen from Dlxon, Illinois, cutting the whorls transversely. 



Figs. 23 to 24 CONRADBM.A nn.i.t I.A t'lrlch. . 910 



23 and 24 Lateral and apertural %.-. the first of the natural size, the second x2.4, uf 



an apparently perfect exa; mine Kroup, Coving ton, Kentucky. 



K Part of a dorsal view of same *4, showing the silt-band and wavy surface 



Imbrications. 

 26 Small part of surface In a lateral view 



