IKOFODA. l |ls l 



marking*. .i|K-rtur.il slit .in. I li.u in- U>neath the figure nlmws the form i>f the IM-I -M. 



(MI Minimi' -:i'l ' Hi.- H.-,-,,I,,I t,, ih, Ust wiii-rl of same specimen, with a small J...M i-n ,,r ti,.- 



surface above and beneath i 1 . I '..mi if the tlat under surface of another specimen of 



bojol. .MM* UK- dlivctliiri nf the line* of growth and the revolving linen which cover nearly ih<- 



.rf.irf. d,fi ,rili>ni>r Hi.' uii.l.T Mir'faceof M. turbintformu, *2, showing very delicate 



win l.iit nt; lin.-N. r, Small jHirtlmi of tlopeof spire of same for comparison with fig >>. 



.ibly different and the sculpture and section of the silt-band widely at 

 varian. in '.he two specie*. (This cut should have appeared on page 050.) 



Several Carboniferous specie* of TWpoujn'ra a and b. Two views of a perfect specimen of 

 T. ryturrulatti Conrad sp., showing the depressed apex, short silt, projecting upper lip and other features 

 characterizing In part this genus and specie*. <-, Inn.-r whorls of another specimen of this species, *10, show- 

 ing several changes which take place In the early development of the shell. Roth specimens are from Spring- 

 Illinois, d and e, A small specimen of 7. eonoeza Ulrlcb, natural size and magnified, viewed so OH to 

 show thedepth of the aiN-nural sinus and slltand the depressed con vex spire. /, The same specimen viewed 

 '.-MI above, y. Another specimen, also *<2, showing the underside, r. concern IH a new species, differing 

 from the others in the gnti,- convexity of the upper side of the whorls. It Is from the Lower Coal Meas- 

 ures at Seville, Illinois. A, Lateral view, <i of a specimen of T. iUinouennt Worthen sp., from Peorla, Illi- 

 nois. (This cut should have appeared on page 057.) 



Errata for the chapter on Oattropoda. 



I'AOB. 



-:.. l'-th to 17th Hoes from top. As this chapter has taken more space than was expected, It Is necessary 



to omit the classification and summary spoken of In th tie lines. 

 -if,. 5th line from bottom, C tubplanu*. This species is well figured on plate LXI (flgs. 40 to 44), but 



unfortunately IU description was overlooked. 



4;. add to last paragraph: For figures of Whltfleld's species see appendix, page 1060. 

 f "71, 10th line from top, between third and fourth words Insert Inn.-r. 



956, add to first paragraph: K<>r Hgures of species of this genus see appendix, page 1080. 

 ' B67. add to second paragraph: For figures of this and other species of this genus see appendix, page 1061. 



*~-980, 4th line fr-iui 1-iUorn, for "page " read page 051. 



78, I'Jth !in.- fmrn bottom, fur " Lwrm^i-ii: \ MI i.n.KCMA Miller" read LOPBOXPIBA TBoriiM.rn,,i: \ 

 Mtik tp.; and to - .f the species add: /'feurotomaria (SealUut) tropidophora MEEK, 1873, 



Pal. Ohi' ;!. xin, UBS. 6a, 6. 



70. 6th Iln.- fr..m Uiltxnn, add: (N.t HALL.) 



982, 10th line from botbun, uml-T I.. ,riin-i-n: \ -A> mi: MI in^Tt i i \ i K i.xxin. m.s. 4061. 

 005, l.'.th line fn)in top. f-ir " rum. 3638" real rm. 3538. 



005, 27th line from ! to In tlf p ir uT.iph beginning with this line Is illustral< 



plat- I. XX \ II by figures 42 it, and is there named Ltoipira moderfa. 



