i:X}'I.ANATION (IP PLATE XX. 



Sthomhina (AAiYri.A) i„io\is Whitf. (p. 111). 



I, L', i!. Thveu viuws (if ;i very iii-rfect shell. 



1. View of -.1 specimen wliieli shows liniii<fs. 



('ANCELLARIA ALTKIiNATA Coiimd (p. 112). 



.'■>,(). Two views of :iii elongated specimen, enlarged (Inic diiiineters. 

 7,8. Siiniliir views of a somewhat broader one. 

 9,10. A still l)id:ider and larger individual, the hack of whii li is luokeu and shows the plicie 

 of the eoliimcdla, enlarged two diameters. 



TKHi:iti!A ixdk.vata Whitf. ()i, 114). 



11. View of an eroded s|ieeimeii, natural size, sliowiiig the condition in which they are 

 mostly I'onnd. 

 12, Ul Two views of a speiiiuen imperfect at the apex, lint retaining the true features on the 

 jiarts preserved, eularged two diameters. 



Tkhehisa cikviuneata Conrad (p. 113). 



14. View of the apical jiortion of a shell, twice enlarged. 

 15, Hi. Two views of .i siiccimeu preserving only the lower volutions; the aperture still imper- 

 fect, eularged two diameters. 

 17. A still further enlargement to show the spiral lines. 



184 



